Canadian Climate Normals 1981-2010 Station Data

Temperature and Precipitation Graph

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Temperature and Precipitation Graph for 1981 to 2010 Canadian Climate Normals
WILLIAMS LAKE A

Symbol	Description
	Daily Maximum Temperature (°C)
	Daily Average Temperature (°C)
	Daily Minimum Temperature (°C)
	Precipitation (mm)

Normals Data

The minimum number of years used to calculate these Normals is indicated by a code for each element. A "+" beside an extreme date indicates that this date is the first occurrence of the extreme value. Values and dates in bold indicate all-time extremes for the location.

Data used in the calculation of these Normals may be subject to further quality assurance checks. This may result in minor changes to some values presented here.

WILLIAMS LAKE A *
BRITISH COLUMBIA

52°10'59.000" N

122°03'15.000" W

939.70 m

1098940

71104

YWL

* This station meets WMO standards for temperature and precipitation.

Temperature

1981 to 2010 Canadian Climate Normals station data
Temperature
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Daily Average (°C)	-6.7	-4.1	0.3	4.9	9.6	13.3	16.0	15.3	10.6	4.6	-2.3	-7.3	4.5	A
Standard Deviation	3.8	3.3	2.4	1.2	1.5	1.4	1.2	1.1	1.6	1.6	3.3	3.5	0.9	A
Daily Maximum (°C)	-2.7	0.8	5.8	11.0	16.0	19.5	22.5	22.2	17.2	9.7	1.4	-3.5	10.0	A
Daily Minimum (°C)	-10.7	-8.9	-5.2	-1.3	3.2	7.0	9.3	8.3	4.0	-0.6	-5.9	-11.0	-1.0	A
Extreme Maximum (°C)	12.8	12.8	18.9	28.8	34.5	33.5	34.4	33.3	35.8	27.1	16.7	11.2
Date (yyyy/dd)	1968/ 20	1963/ 06	1994/ 29	1977/ 25	1983/ 29	1992/ 26	1971/ 31	1981/ 11	1988/ 04	1987/ 01	1975/ 04	1980/ 15
Extreme Minimum (°C)	-42.2	-34.6	-31.7	-16.7	-5.8	-4.0	0.0	-1.7	-8.9	-28.6	-41.6	-42.8
Date (yyyy/dd)	1969/ 28	1989/ 02	1976/ 03	1966/ 11	1986/ 14	2009/ 09	1971/ 02	1973/ 19	1972/ 27	1984/ 31	1985/ 27	1968/ 29

Precipitation

1981 to 2010 Canadian Climate Normals station data
Precipitation
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Rainfall (mm)	4.6	2.0	3.9	13.2	36.0	58.3	52.7	46.1	41.2	32.6	14.2	2.9	307.6	A
Snowfall (cm)	36.9	21.1	17.5	10.2	3.3	0.3	0.0	0.0	0.6	9.4	33.0	44.5	176.8	A
Precipitation (mm)	33.1	18.6	17.9	22.2	39.1	58.6	52.7	46.1	41.8	41.0	42.2	37.6	450.7	A
Average Snow Depth (cm)	30	28	13	1	0	0	0	0	0	0	6	19	8	A
Median Snow Depth (cm)	30	27	12	0	0	0	0	0	0	0	4	19	8	A
Snow Depth at Month-end (cm)	31	23	5	0	0	0	0	0	0	1	12	30	8	A
Extreme Daily Rainfall (mm)	17.4	14.2	10.6	20.3	24.6	26.6	37.2	46.0	24.9	37.8	29.6	28.4
Date (yyyy/dd)	2004/ 22	1962/ 02	1998/ 22	1969/ 23	1987/ 01	1994/ 18	2009/ 09	1989/ 02	1969/ 13	1995/ 14	1989/ 03	2008/ 05
Extreme Daily Snowfall (cm)	42.7	15.2	32.2	17.2	11.7	7.8	0.3	0.0	7.9	19.1	32.3	31.4
Date (yyyy/dd)	1962/ 07	2008/ 14	1980/ 09	1982/ 03	1967/ 24	1985/ 23	1989/ 19	1961/ 01	1961/ 28	1966/ 20	1990/ 23	1989/ 20
Extreme Daily Precipitation (mm)	42.7	14.2	32.8	24.9	24.6	26.6	37.2	46.0	27.9	37.8	34.3	38.8
Date (yyyy/dd)	1962/ 07	1962/ 02	1980/ 09	1969/ 13	1987/ 01	1994/ 18	2009/ 09	1989/ 02	1969/ 13	1995/ 14	1990/ 23	2008/ 05
Extreme Snow Depth (cm)	94	112	86	44	8	0	0	0	5	15	52	73
Date (yyyy/dd)	1971/ 31	1965/ 16	1965/ 01	1982/ 04	2010/ 03	1961/ 01	1961/ 01	1961/ 01	1972/ 28	2004/ 20	1990/ 24	1990/ 31

Days with Maximum Temperature

1981 to 2010 Canadian Climate Normals station data
Days with Maximum Temperature
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
<= 0 °C	17.1	10.6	3.1	0.30	0.0	0.0	0.0	0.0	0.0	1.2	9.4	21.2	62.9	A
> 0 °C	13.9	17.7	27.9	29.7	31.0	30.0	31.0	31.0	30.0	29.8	20.6	9.8	302.4	A
> 10 °C	0.13	0.62	5.8	16.8	27.8	29.7	31.0	31.0	27.2	14.3	1.3	0.0	185.6	A
> 20 °C	0.0	0.0	0.0	0.97	6.7	12.8	21.0	19.9	8.7	1.0	0.0	0.0	71.1	A
> 30 °C	0.0	0.0	0.0	0.0	0.20	0.47	2.0	1.4	0.23	0.0	0.0	0.0	4.3	A
> 35 °C	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.03	0.0	0.0	0.0	0.03	A

Days with Minimum Temperature

1981 to 2010 Canadian Climate Normals station data
Days with Minimum Temperature
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
> 0 °C	1.6	2.5	4.7	10.2	24.3	29.7	31.0	30.9	25.0	13.9	4.0	1.2	179.1	A
<= 2 °C	30.6	27.7	29.2	24.6	12.1	1.3	0.07	0.73	9.2	22.1	28.1	30.8	216.4	A
<= 0 °C	29.4	25.7	26.3	19.8	6.7	0.30	0.0	0.10	5.0	17.1	26.0	29.8	186.2	A
< -2 °C	26.7	23.2	21.7	12.5	2.3	0.03	0.0	0.0	1.8	11.4	20.5	27.6	147.8	A
< -10 °C	12.9	10.8	5.2	0.37	0.0	0.0	0.0	0.0	0.0	0.73	6.2	15.4	51.6	A
< -20 °C	5.1	2.7	0.93	0.0	0.0	0.0	0.0	0.0	0.0	0.10	1.4	4.0	14.2	A
< - 30 °C	1.5	0.28	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.30	0.97	3.0	A

Days with Rainfall

1981 to 2010 Canadian Climate Normals station data
Days with Rainfall
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
>= 0.2 mm	1.8	1.4	2.7	6.2	12.0	14.8	13.0	10.8	10.5	10.2	4.6	1.5	89.4	A
>= 5 mm	0.30	0.07	0.13	0.80	2.7	4.2	3.4	3.1	3.1	1.9	0.90	0.10	20.6	A
>= 10 mm	0.10	0.0	0.03	0.17	0.70	1.4	1.4	1.1	1.1	0.63	0.27	0.03	6.9	A
>= 25 mm	0.0	0.0	0.0	0.0	0.0	0.07	0.10	0.10	0.0	0.07	0.03	0.03	0.40	A

Days With Snowfall

1981 to 2010 Canadian Climate Normals station data
Days With Snowfall
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
>= 0.2 cm	11.1	8.0	6.8	4.4	1.8	0.10	0.07	0.0	0.33	3.4	9.7	12.3	58.0	A
>= 5 cm	2.6	1.4	1.2	0.60	0.20	0.03	0.0	0.0	0.0	0.57	2.4	3.1	12.1	A
>= 10 cm	0.47	0.27	0.23	0.10	0.0	0.0	0.0	0.0	0.0	0.17	0.67	0.93	2.8	A
>= 25 cm	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.03	0.07	0.10	A

Days with Precipitation

1981 to 2010 Canadian Climate Normals station data
Days with Precipitation
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
>= 0.2 mm	12.0	8.7	8.7	9.1	12.6	14.8	13.1	10.8	10.5	11.9	12.5	12.8	137.4	A
>= 5 mm	2.1	1.0	1.1	1.4	3.0	4.2	3.4	3.1	3.1	2.6	2.8	2.1	29.9	A
>= 10 mm	0.53	0.10	0.13	0.27	0.77	1.4	1.4	1.1	1.1	0.77	0.93	0.43	9.0	A
>= 25 mm	0.03	0.0	0.0	0.0	0.0	0.07	0.10	0.10	0.0	0.10	0.07	0.04	0.51	A

Days with Snow Depth

1981 to 2010 Canadian Climate Normals station data
Days with Snow Depth
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
>= 1 cm	30.4	26.5	18.5	3.7	0.27	0.0	0.0	0.0	0.03	2.0	15.1	29.2	125.6	A
>= 5 cm	28.2	24.1	14.6	2.0	0.03	0.0	0.0	0.0	0.0	0.72	9.9	28.1	107.7	A
>= 10 cm	26.7	20.7	12.6	1.4	0.0	0.0	0.0	0.0	0.0	0.28	7.2	24.1	92.9	A
>= 20 cm	20.9	18.8	9.5	0.60	0.0	0.0	0.0	0.0	0.0	0.0	1.8	15.7	67.2	A

Wind

1981 to 2010 Canadian Climate Normals station data
Wind
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Speed (km/h)	10.6	10.6	10.8	10.5	9.3	8.1	7.0	6.7	7.6	10.4	11.5	11.1	9.5	A
Most Frequent Direction	SE	SE	SE	SE	SE	SE	N	SE	SE	SE	SE	SE	SE	A
Maximum Hourly Speed (km/h)	60	72	72	61	56	56	56	64	53	56	64	68
Date (yyyy/dd)	1968/ 13	1963/ 05	1963/ 20	1977/ 25	1963/ 05	1968/ 26	1979/ 11	1971/ 17	1972/ 20	1982/ 22	1962/ 23	1967/ 06
Direction of Maximum Hourly Speed	S	SE	SE	SE	SE	NW	SE	S	SE	SE	S	SE
Maximum Gust Speed (km/h)	90	93	92	83	83	107	97	83	84	100	93	102
Date (yyyy/dd)	1973/ 20	1999/ 05	1973/ 18	1984/ 14	1988/ 12	1985/ 29	1965/ 07	1985/ 14	1972/ 20	1976/ 31	1975/ 12	1987/ 01
Direction of Maximum Gust	SE	SE	SE	SE	SE	NE	W	W	SE	W	S	SE
Days with Winds >= 52 km/h	0.3	0.3	0.2	0.2	0.1	0.0	0.1	0.0	0.0	0.2	0.4	0.6	2.4	A
Days with Winds >= 63 km/h	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	A

Degree Days

1981 to 2010 Canadian Climate Normals station data
Degree Days
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Above 24 °C	0	0	0	0	0	0	0.1	0	0	0	0	0	0.1	A
Above 18 °C	0	0	0	0	1.2	4.3	17.2	12.3	1.8	0.1	0	0	36.9	A
Above 15 °C	0	0	0	0	5.9	19.9	56.2	47.1	8.5	0.4	0	0	138	A
Above 10 °C	0	0	0.1	5	44.4	104.6	185.2	164.5	58.8	8.5	0	0	570.9	A
Above 5 °C	0.5	0.9	7.3	42.3	148.8	248.2	339.6	317.8	171.9	48.5	4	0.1	1329.8	A
Above 0 °C	12.7	21.6	64.5	151.3	298.5	398.2	494.6	472.8	318.5	155.6	33.8	7.6	2429.4	A
Below 0 °C	220.6	140	55	5.2	0.1	0	0	0	0	13.5	102.3	237.2	773.9	A
Below 5 °C	363.4	260.6	152.9	46.3	5.5	0	0	0	3.4	61.4	222.5	384.7	1500.5	A
Below 10 °C	517.9	400.9	300.6	158.9	56	6.4	0.6	1.7	40.3	176.4	368.5	539.6	2567.8	A
Below 15 °C	672.9	542.1	455.5	303.9	172.6	71.7	26.6	39.4	140	323.4	518.5	694.6	3961.1	A
Below 18 °C	765.9	626.8	548.5	393.9	260.8	146.2	80.6	97.6	223.3	416	608.5	787.6	4955.7	A

Bright Sunshine

1981 to 2010 Canadian Climate Normals station data
Bright Sunshine
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Total Hours	58.6	97.4	154.6	198.0	248.8	242.4	283.5	273.4	199.2	123.8	60.3	45.8	1985.8	C
Days with measurable	18.9	22.4	28.0	28.6	30.1	29.5	30.0	30.2	28.5	26.1	19.2	16.2	307.5	C
% of possible daylight hours	22.8	34.9	42.1	47.5	51.2	48.5	56.3	60.1	52.3	37.4	22.8	18.9	41.2	C
Extreme Daily	8.5	10.1	11.6	14.4	15.7	16.3	15.9	15.3	13.4	10.5	9.1	7.7
Date (yyyy/dd)	2000/ 30	1987/ 24	1970/ 30	1968/ 26	1968/ 16	1982/ 16	1967/ 02	1974/ 03	1997/ 02	1970/ 01	1977/ 14	1978/ 29

Humidex

1981 to 2010 Canadian Climate Normals station data
Humidex
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Extreme Humidex	12.2	19.6	18.2	28.0	33.9	32.2	36.2	36.4	35.6	26.8	16.1	10.6
Date (yyyy/dd)	1968/ 20	2009/ 27	1994/ 29	1977/ 25	1983/ 29	1969/ 18	1975/ 08	1981/ 09	1988/ 04	1987/ 01	1975/ 04	1980/ 15
Days with Humidex >= 30	0.0	0.0	0.0	0.0	0.2	0.3	1.8	1.5	0.2	0.0	0.0	0.0	4.1	A
Days with Humidex >= 35	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	A
Days with Humidex >= 40	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	A

Wind Chill

1981 to 2010 Canadian Climate Normals station data
Wind Chill
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Extreme Wind Chill (°C)	-47	-45	-40	-22	-12	-4	0	-3	-11	-35	-50	-52
Date (yyyy/dd)	1979/ 01	1989/ 01	2003/ 08	1966/ 11	2002/ 05	1973/ 02	1961/ 01	1992/ 24	1965/ 15	1984/ 31	1985/ 26	1964/ 15
Days with Wind Chill < -20	7.1	4.8	1.8	0.1	0.0	0.0	0.0	0.0	0.0	0.3	2.3	6.3	22.7	A
Days with Wind Chill < -30	2.7	1.1	0.4	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.7	2.3	7.3	A
Days with Wind Chill < -40	0.3	0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.5	1.0	A

Humidity

1981 to 2010 Canadian Climate Normals station data
Humidity
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Average Vapour Pressure (kPa)	0.4	0.4	0.4	0.5	0.7	0.9	1	1	0.8	0.6	0.5	0.3	0.6	A
Average Relative Humidity - 0600LST (%)	83.4	80.9	77	73.7	72.4	73.6	74.5	78.8	83	82.4	84.1	83.4	78.9	A
Average Relative Humidity - 1500LST (%)	75.1	62.1	47.2	41	40.8	44	41.6	41.1	45.6	56.7	72.8	77.4	53.8	A

Pressure

1981 to 2010 Canadian Climate Normals station data
Pressure
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
Average Station Pressure (kPa)	90.4	90.5	90.3	90.4	90.5	90.6	90.8	90.8	90.8	90.6	90.4	90.5	90.6	A
Average Sea Level Pressure (kPa)	101.8	101.7	101.5	101.5	101.5	101.5	101.6	101.6	101.7	101.7	101.5	101.8	101.6	A

Visibility (hours with)

1981 to 2010 Canadian Climate Normals station data
Visibility (hours with)
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
< 1 km	20.4	12	4.5	3.6	2.3	3.3	3.8	3.9	7.9	18.4	26	17.5	123.5	C
1 to 9 km	97.5	71.6	33.6	27.4	15.4	15.1	15.8	14.5	20.9	48.3	87.7	107.9	555.7	C
> 9 km	626.2	593.2	705.9	689	726.4	701.7	724.4	725.5	691.2	677.3	606.3	618.6	8085.6	C

Cloud Amount (hours with)

1981 to 2010 Canadian Climate Normals station data
Cloud Amount (hours with)
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Code
0 to 2 tenths	127.9	145.2	188.9	156.5	141.6	122.2	183.2	219.8	219.5	178.6	112.8	124.3	1920.5	C
3 to 7 tenths	128.4	136.4	174.2	188.9	208.7	222.8	252.3	228.6	177.1	153	130.3	132.9	2133.7	C
8 to 10 tenths	487.7	395.2	380.9	374.5	393.7	375	308.5	295.6	323.4	412.4	476.9	486.8	4710.7	C

Frost-Free

1981 to 2010 Canadian Climate Normals station data
Frost-Free
	Date/Days	Code
Average Date of Last Spring Frost	May 23	A
Average Date of First Fall Frost	Sept 13	A
Average Length of Frost-Free Period	112 Days	A

1981 to 2010 Canadian Climate Normals station data
Frost-Free
Probability of last temperature in spring of 0 °C or lower on or after indicated dates	10%	25%	33%	50%	66%	75%	90%
Date	Jun 18	Jun 08	Jun 02	May 26	May 23	May 20	May 11
Probability of first temperature in fall of 0 °C or lower on or before indicated dates	10%	25%	33%	50%	66%	75%	90%
Date	Aug 29	Sep 05	Sep 07	Sep 11	Sep 15	Sep 17	Sep 20
Probability of frost-free period equal to or less than indicated period (Days)	10%	25%	33%	50%	66%	75%	90%
Days	81	90	95	107	114	117	130

Legend

A = WMO "3 and 5 rule" (i.e. no more than 3 consecutive and no more than 5 total missing for either temperature or precipitation)
B = At least 25 years

C = At least 20 years
D = At least 15 years

Station / Element Metadata

Statistics listed below are provided as a guide to determine the validity of Normals and Extremes calculations. For example, a station with 30 years of record between 1981 and 2010 with no missing years would be a more reliable normal than a station with 15 years of record and 2 missing years. Less than 100% possible observations indicates that out of the total number of observations used, some records were missing.

WILLIAMS LAKE A

Province/Territory

Latitude (dd mm):

52 11 N

Country

CAN

Longitude (ddd mm):

122 03 W

Time Zone

PST

Latitude (decimal degrees):

52.18 N

Climate ID:

1098940

Longitude (decimal degrees):

122.05 W

WMO ID:

71104

Elevation (m):

939.7

TC ID:

YWL

Temperature

1981 to 2010 Canadian Climate Normals Element Metadata
Temperature
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Daily Average (°C)	1981	2010	30	0	10954	100
Standard Deviation	1981	2010	30	0	10954	100
Daily Maximum (°C)	1981	2010	30	0	10954	100
Daily Minimum (°C)	1981	2010	30	0	10954	100
Extreme Maximum (°C)	1960	2010			18281	99.9
Extreme Minimum (°C)	1960	2010			18281	99.9

Precipitation

1981 to 2010 Canadian Climate Normals Element Metadata
Precipitation
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Rainfall (mm)	1981	2010	30	1	10895	99.4
Snowfall (cm)	1981	2010	30	1	10895	99.4
Precipitation (mm)	1981	2010	30	1	10895	99.4
Average Snow Depth (cm)	1981	2010	30	0	10950	99.9
Median Snow Depth (cm)	1981	2010	30	0	10950	99.9
Snow Depth at Month-end (cm)	1981	2010	30	1	359	99.7
Extreme Daily Rainfall (mm)	1960	2010			18275	99.9
Extreme Daily Snowfall (cm)	1960	2010			18274	99.9
Extreme Daily Precipitation (mm)	1960	2010			18274	99.9
Extreme Snow Depth (cm)	1960	2010			18268	99.9

Days with Maximum Temperature

1981 to 2010 Canadian Climate Normals Element Metadata
Days with Maximum Temperature
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
<= 0 °C	1981	2010	30	1	10867	99.2
> 0 °C	1981	2010	30	1	10867	99.2
> 10 °C	1981	2010	30	1	10867	99.2
> 20 °C	1981	2010	30	1	10867	99.2
> 30 °C	1981	2010	30	1	10867	99.2
> 35 °C	1981	2010	30	1	10867	99.2

Days with Minimum Temperature

1981 to 2010 Canadian Climate Normals Element Metadata
Days with Minimum Temperature
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
> 0 °C	1981	2010	30	1	10867	99.2
<= 2 °C	1981	2010	30	1	10867	99.2
<= 0 °C	1981	2010	30	1	10867	99.2
< -2 °C	1981	2010	30	1	10867	99.2
< -10 °C	1981	2010	30	1	10867	99.2
< -20 °C	1981	2010	30	1	10867	99.2
< - 30 °C	1981	2010	30	1	10867	99.2

Days with Rainfall

1981 to 2010 Canadian Climate Normals Element Metadata
Days with Rainfall
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
>= 0.2 mm	1981	2010	30	1	10926	99.7
>= 5 mm	1981	2010	30	1	10926	99.7
>= 10 mm	1981	2010	30	1	10926	99.7
>= 25 mm	1981	2010	30	1	10926	99.7

Days With Snowfall

1981 to 2010 Canadian Climate Normals Element Metadata
Days With Snowfall
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
>= 0.2 cm	1981	2010	30	1	10895	99.4
>= 5 cm	1981	2010	30	1	10895	99.4
>= 10 cm	1981	2010	30	1	10895	99.4
>= 25 cm	1981	2010	30	1	10895	99.4

Days with Precipitation

1981 to 2010 Canadian Climate Normals Element Metadata
Days with Precipitation
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
>= 0.2 mm	1981	2010	30	1	10895	99.4
>= 5 mm	1981	2010	30	1	10895	99.4
>= 10 mm	1981	2010	30	1	10895	99.4
>= 25 mm	1981	2010	30	1	10895	99.4

Days with Snow Depth

1981 to 2010 Canadian Climate Normals Element Metadata
Days with Snow Depth
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
>= 1 cm	1981	2010	30	1	10776	98.3
>= 5 cm	1981	2010	30	1	10776	98.3
>= 10 cm	1981	2010	30	1	10776	98.3
>= 20 cm	1981	2010	30	1	10776	98.3

Wind

1981 to 2010 Canadian Climate Normals Element Metadata
Wind
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Speed (km/h)	1981	2010	30	0	262723	99.9
Most Frequent Direction	1981	2010	30	0	262724	99.9
Maximum Hourly Speed (km/h)	1961	2010			437725	99.9
Maximum Gust Speed (km/h)	1961	2010			17680	99.3
Days with Winds >= 52 km/h	1981	2010	30	2	10833	98.9
Days with Winds >= 63 km/h	1981	2010	30	2	10833	98.9

Degree Days

1981 to 2010 Canadian Climate Normals Element Metadata
Degree Days
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Above 24 °C	1981	2010	30	1	10867	99.2
Above 18 °C	1981	2010	30	1	10867	99.2
Above 15 °C	1981	2010	30	1	10867	99.2
Above 10 °C	1981	2010	30	1	10867	99.2
Above 5 °C	1981	2010	30	1	10867	99.2
Above 0 °C	1981	2010	30	1	10867	99.2
Below 0 °C	1981	2010	30	1	10867	99.2
Below 5 °C	1981	2010	30	1	10867	99.2
Below 10 °C	1981	2010	30	1	10867	99.2
Below 15 °C	1981	2010	30	1	10867	99.2
Below 18 °C	1981	2010	30	1	10867	99.2

Bright Sunshine

1981 to 2010 Canadian Climate Normals Element Metadata
Bright Sunshine
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Total Hours	1981	2001	21	1	180408	98.1
Days with measurable	1981	2001	21	1	180408	98.1
% of possible daylight hours	1981	2001	21	1	180408	98.1
Extreme Daily	1961	2002			356846	99.3

Humidex

1981 to 2010 Canadian Climate Normals Element Metadata
Humidex
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Extreme Humidex	1961	2010			437282	99.8
Days with Humidex >= 30	1981	2010	30	1	261969	99.6
Days with Humidex >= 35	1981	2010	30	1	261969	99.6
Days with Humidex >= 40	1981	2010	30	1	261969	99.6

Wind Chill

1981 to 2010 Canadian Climate Normals Element Metadata
Wind Chill
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Extreme Wind Chill (°C)	1961	2010			437393	99.8
Days with Wind Chill < -20	1981	2010	30	1	261992	99.6
Days with Wind Chill < -30	1981	2010	30	1	261992	99.6
Days with Wind Chill < -40	1981	2010	30	1	261992	99.6

Humidity

1981 to 2010 Canadian Climate Normals Element Metadata
Humidity
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Average Vapour Pressure (kPa)	1981	2010	30	1	261969	99.6
Average Relative Humidity - 0600LST (%)	1981	2010	30	0	10946	99.9
Average Relative Humidity - 1500LST (%)	1981	2010	30	0	10954	100

Pressure

1981 to 2010 Canadian Climate Normals Element Metadata
Pressure
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Average Station Pressure (kPa)	1981	2010	30	1	261990	99.6
Average Sea Level Pressure (kPa)	1981	2010	30	1	261961	99.6

Visibility (hours with)

1981 to 2010 Canadian Climate Normals Element Metadata
Visibility (hours with)
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
< 1 km	1981	2010	26	8	210312	80
1 to 9 km	1981	2010	26	8	210312	80
> 9 km	1981	2010	26	8	210312	80

Cloud Amount (hours with)

1981 to 2010 Canadian Climate Normals Element Metadata
Cloud Amount (hours with)
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
0 to 2 tenths	1981	2010	26	8	209568	79.7
3 to 7 tenths	1981	2010	26	8	209568	79.7
8 to 10 tenths	1981	2010	26	8	209568	79.7

Frost-Free

1981 to 2010 Canadian Climate Normals Element Metadata
Frost-Free
	Begin Year	End Year	Total Number of Years	Missing Years	Total Count of Observations	% of Possible Observations
Average Date of Last Spring Frost	1981	2010	27	2	27	90.0
Average Date of First Fall Frost	1981	2010	27	2	27	90.0
Average Length of Frost-Free Period	1981	2010	27	2	27	90.0
Probability of last temperature in spring <= 0°C, on or after (Date)
10 %	1961	2010	49	3	46	92.0
25 %	1961	2010	49	3	46	92.0
33 %	1961	2010	49	3	46	92.0
50 %	1961	2010	49	3	46	92.0
66 %	1961	2010	49	3	46	92.0
75 %	1961	2010	49	3	46	92.0
90 %	1961	2010	49	3	46	92.0
Probability of first temperature in fall <= 0°C, on or before (Date)
10 %	1961	2010	49	3	46	92.0
25 %	1961	2010	49	3	46	92.0
33 %	1961	2010	49	3	46	92.0
50 %	1961	2010	49	3	46	92.0
66 %	1961	2010	49	3	46	92.0
75 %	1961	2010	49	3	46	92.0
90 %	1961	2010	49	3	46	92.0
Probability of frost-free period equal to or less than indicated period (Days)
10 %	1961	2010	49	3	46	92.0
25 %	1961	2010	49	3	46	92.0
33 %	1961	2010	49	3	46	92.0
50 %	1961	2010	49	3	46	92.0
66 %	1961	2010	49	3	46	92.0
75 %	1961	2010	49	3	46	92.0
90 %	1961	2010	49	3	46	92.0

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Date modified:: 2024-03-27

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Canadian Climate Normals 1981-2010 Station Data

Temperature and Precipitation Graph for 1981 to 2010 Canadian Climate Normals
WILLIAMS LAKE A

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Canadian Climate Normals 1981-2010 Station Data

Temperature and Precipitation Graph for 1981 to 2010 Canadian Climate NormalsWILLIAMS LAKE A

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Temperature and Precipitation Graph for 1981 to 2010 Canadian Climate Normals
WILLIAMS LAKE A