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
TRENTON 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.

TRENTON A *
ONTARIO
Current Station Operator: DND

44°07'08.000" N

77°31'41.000" W

86.30 m

6158875

71621

YTR

* 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)	-6.8	-5.7	-0.7	6.6	12.7	18.0	20.7	19.7	15.3	8.6	3.0	-3.3	7.3	A
Standard Deviation	3.2	2.4	2.1	1.6	1.6	1.3	1.2	1.2	1.3	1.3	1.4	2.8	0.8	A
Daily Maximum (°C)	-2.0	-0.7	4.2	11.9	18.4	23.6	26.3	25.3	20.9	13.8	7.4	1.0	12.5	A
Daily Minimum (°C)	-11.6	-10.6	-5.7	1.2	7.0	12.3	15.2	14.0	9.7	3.5	-1.4	-7.6	2.2	A
Extreme Maximum (°C)	15.1	13.5	25.4	29.6	33.4	35.6	38.9	36.1	35.0	27.0	22.8	16.2
Date (yyyy/dd)	2008/ 08	1981/ 22	1998/ 31	1990/ 28	2010/ 26	1964/ 30	1936/ 09+	1948/ 26	1953/ 02	2002/ 01+	1961/ 03	1982/ 03
Extreme Minimum (°C)	-35.1	-32.2	-28.9	-14.4	-6.1	1.1	5.6	3.3	-4.6	-8.3	-19.4	-31.8
Date (yyyy/dd)	1994/ 16	1943/ 15	1938/ 04	1972/ 07	1966/ 07	1945/ 01+	1936/ 02+	1935/ 31+	1978/ 26	1936/ 27	1949/ 27	1993/ 27

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)	34.2	29.2	41.1	72.2	79.4	78.3	69.0	72.2	90.1	83.3	86.9	50.4	786.3	A
Snowfall (cm)	44.8	34.6	23.8	5.6	0.0	0.0	0.0	0.0	0.0	0.3	10.4	36.5	156.0	A
Precipitation (mm)	68.1	56.5	62.3	77.3	79.4	78.3	69.0	72.2	90.1	83.6	95.5	79.0	911.4	A
Average Snow Depth (cm)	8	9	4	0	0	0	0	0	0	0	0	4	2	A
Median Snow Depth (cm)	7	8	3	0	0	0	0	0	0	0	0	3	2	A
Snow Depth at Month-end (cm)	10	7	0	0	0	0	0	0	0	0	0	6	2	A
Extreme Daily Rainfall (mm)	45.0	38.6	58.2	51.2	71.1	80.8	78.8	72.0	107.2	64.5	59.3	97.0
Date (yyyy/dd)	1978/ 26	1983/ 02	1980/ 21	1984/ 05	1943/ 11	1984/ 18	2002/ 26	1977/ 16	2004/ 09	1955/ 14+	1985/ 04	1941/ 24
Extreme Daily Snowfall (cm)	31.0	36.4	35.6	18.3	5.0	0.0	0.0	0.0	0.0	5.1	32.3	34.4
Date (yyyy/dd)	1981/ 09	1984/ 28	1947/ 02	1975/ 03	1977/ 08	1935/ 01+	1935/ 01+	1935/ 01+	1935/ 01+	1969/ 22	1956/ 25	2009/ 09
Extreme Daily Precipitation (mm)	54.2	38.6	58.2	51.2	71.1	80.8	78.8	72.0	107.2	64.5	59.3	97.0
Date (yyyy/dd)	1978/ 26	1983/ 02	1980/ 21	1984/ 05	1943/ 11	1984/ 18	2002/ 26	1977/ 16	2004/ 09	1955/ 14+	1985/ 04	1941/ 24
Extreme Snow Depth (cm)	57	46	41	20	3	0	0	0	0	5	34	59
Date (yyyy/dd)	1978/ 22	1971/ 18	1971/ 21+	1975/ 05	1963/ 01	1955/ 01+	1955/ 01+	1955/ 01+	1955/ 01+	1969/ 22+	1956/ 27	1977/ 22

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	17.5	14.6	6.8	0.43	0.0	0.0	0.0	0.0	0.0	0.0	1.5	12.1	52.9	A
> 0 °C	13.6	13.6	24.2	29.6	31.0	30.0	31.0	31.0	30.0	31.0	28.5	18.9	312.3	A
> 10 °C	0.55	0.33	5.0	18.5	30.2	30.0	31.0	31.0	29.8	24.6	8.9	1.3	211.2	A
> 20 °C	0.0	0.0	0.20	2.5	11.1	24.0	30.3	29.8	17.7	2.9	0.0	0.0	118.3	A
> 30 °C	0.0	0.0	0.0	0.0	0.23	1.6	4.0	2.0	0.23	0.0	0.0	0.0	8.0	A
> 35 °C	0.0	0.0	0.0	0.0	0.0	0.0	0.03	0.03	0.0	0.0	0.0	0.0	0.06	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	1.9	1.7	5.0	18.2	30.0	30.0	31.0	31.0	29.6	23.6	11.6	3.6	217.2	A
<= 2 °C	30.4	27.9	28.9	17.6	3.5	0.07	0.0	0.0	1.3	12.7	23.4	29.7	175.6	A
<= 0 °C	29.1	26.6	26.0	11.8	0.97	0.0	0.0	0.0	0.43	7.4	18.4	27.4	148.0	A
< -2 °C	26.8	24.3	21.3	6.7	0.13	0.0	0.0	0.0	0.07	3.3	13.4	23.7	119.8	A
< -10 °C	17.4	15.1	7.0	0.23	0.0	0.0	0.0	0.0	0.0	0.0	0.97	10.7	51.3	A
< -20 °C	5.3	2.4	0.70	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	1.5	9.9	A
< - 30 °C	0.38	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.07	0.45	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	5.7	5.3	8.0	11.3	12.3	11.8	10.1	11.2	11.3	13.2	12.3	7.9	120.4	A
>= 5 mm	2.2	1.7	2.6	4.5	5.1	4.6	3.7	4.1	4.7	5.3	5.1	3.2	46.8	A
>= 10 mm	1.1	0.83	1.3	2.5	2.6	2.6	2.2	2.3	3.0	2.5	2.8	1.6	25.4	A
>= 25 mm	0.24	0.23	0.20	0.40	0.60	0.59	0.53	0.60	0.97	0.40	0.67	0.28	5.7	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	12.6	10.0	7.0	2.1	0.03	0.0	0.0	0.0	0.0	0.23	3.7	10.5	46.2	A
>= 5 cm	2.9	2.4	1.6	0.33	0.0	0.0	0.0	0.0	0.0	0.0	0.70	2.2	10.2	A
>= 10 cm	1.2	0.77	0.60	0.10	0.0	0.0	0.0	0.0	0.0	0.0	0.17	1.1	3.9	A
>= 25 cm	0.07	0.07	0.03	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.07	0.24	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	15.9	12.9	12.6	12.3	12.3	11.8	10.1	11.2	11.3	13.3	14.5	15.2	153.4	A
>= 5 mm	4.5	3.9	4.2	4.8	5.1	4.6	3.7	4.1	4.7	5.3	5.7	5.1	55.6	A
>= 10 mm	1.8	1.5	1.8	2.7	2.6	2.6	2.2	2.3	3.0	2.5	3.1	2.5	28.6	A
>= 25 mm	0.34	0.30	0.23	0.40	0.60	0.59	0.53	0.60	0.97	0.40	0.70	0.38	6.0	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	22.6	21.6	14.1	1.3	0.0	0.0	0.0	0.0	0.0	0.0	3.0	16.0	78.5	A
>= 5 cm	17.0	16.2	9.1	0.57	0.0	0.0	0.0	0.0	0.0	0.0	0.97	10.1	54.0	A
>= 10 cm	11.1	11.3	5.5	0.30	0.0	0.0	0.0	0.0	0.0	0.0	0.43	5.2	33.8	A
>= 20 cm	2.9	4.0	1.8	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	1.6	10.3	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)	15.2	14.3	14.4	15.0	13.0	11.7	11.4	10.3	11.1	12.5	13.9	14.6	13.1	A
Most Frequent Direction	W	W	W	SW	SW	SW	SW	SW	SW	SW	W	W	SW	A
Maximum Hourly Speed (km/h)	89	74	105	76	64	72	64	63	64	74	80	69
Date (yyyy/dd)	1978/ 26	1968/ 17+	1964/ 05	1977/ 05	1962/ 06	1957/ 29	1969/ 05	1967/ 04+	1958/ 30	1993/ 04	1992/ 13	1960/ 09+
Direction of Maximum Hourly Speed	W	W	W	SW	W	W	W	SW	SW	SW	SW	W
Maximum Gust Speed (km/h)	153	113	145	128	106	119	127	103	116	106	145	154
Date (yyyy/dd)	1959/ 05	1956/ 25	1964/ 05	1979/ 06	1964/ 09	1965/ 28	1967/ 24	1958/ 31	1958/ 30	1967/ 18	1956/ 21	1958/ 22
Direction of Maximum Gust	NW	W	W	W	W	W	SW	W	SW	N	W	W
Days with Winds >= 52 km/h	1.9	1.4	1.1	1.5	0.7	0.2	0.2	0.5	0.7	0.9	1.7	1.9	12.7	A
Days with Winds >= 63 km/h	0.4	0.3	0.3	0.5	0.0	0.1	0.0	0.1	0.1	0.2	0.3	0.2	2.6	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	0.1	1.4	6.6	3.5	0.4	0	0	0	12.1	A
Above 18 °C	0	0	0	0.3	6.3	42	91.7	70.6	17.4	0.5	0	0	228.9	A
Above 15 °C	0	0	0	2.3	23.1	100.5	178.3	149.1	52.3	3.6	0	0	509.2	A
Above 10 °C	0	0	1	17.6	100.6	239.8	333	302.3	164.3	33.1	2.8	0.1	1194.5	A
Above 5 °C	1.2	0.6	11.2	78.6	239.4	389.6	488	457.3	309.6	123.3	28.2	3.8	2130.8	A
Above 0 °C	13.9	13.1	58.7	201.1	394.2	539.6	643	612.3	459.4	267.8	109.7	28.9	3341.8	A
Below 0 °C	225.6	173.1	81.6	4.4	0	0	0	0	0	0.1	20.3	130.7	635.8	A
Below 5 °C	367.9	301.7	189.1	31.9	0.2	0	0	0	0.2	10.6	88.9	260.7	1,251	A
Below 10 °C	521.7	442.3	333.8	120.8	16.3	0.1	0	0	4.9	75.4	213.4	412	2140.8	A
Below 15 °C	676.7	583.5	487.9	255.6	93.9	10.9	0.2	1.8	42.9	200.9	360.6	566.9	3281.7	A
Below 18 °C	769.7	668.2	580.8	343.6	170.1	42.4	6.6	16.3	98	290.9	450.6	659.9	4097.1	A

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	17.4	14.1	27.9	32.5	42.3	43.5	44.4	49.3	43.5	35.0	26.4	18.5
Date (yyyy/dd)	1995/ 15	1981/ 22	1998/ 31	1990/ 25	1962/ 17	1994/ 18	1999/ 05	1955/ 01	1953/ 02	2007/ 08	1961/ 03	1982/ 04
Days with Humidex >= 30	0.0	0.0	0.0	0.2	1.3	8.4	17.1	15.0	4.2	0.2	0.0	0.0	46.5	A
Days with Humidex >= 35	0.0	0.0	0.0	0.0	0.2	2.3	5.9	4.6	0.8	0.0	0.0	0.0	13.9	A
Days with Humidex >= 40	0.0	0.0	0.0	0.0	0.0	0.1	1.0	0.5	0.0	0.0	0.0	0.0	1.6	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)	-45	-44	-36	-22	-8	0	0	0	-6	-12	-29	-42
Date (yyyy/dd)	1981/ 04	1976/ 02	2003/ 03	1954/ 03	1963/ 01	1953/ 01+	1953/ 01+	1953/ 01+	1991/ 30	1969/ 23	1958/ 30	1980/ 25
Days with Wind Chill < -20	12.1	8.5	3.2	0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.1	5.7	29.6	A
Days with Wind Chill < -30	3.2	0.9	0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.5	4.8	A
Days with Wind Chill < -40	0.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.3	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)	0.3	0.4	0.5	0.7	1.1	1.5	1.8	1.8	1.4	0.9	0.6	0.4	1	A
Average Relative Humidity - 0600LST (%)	79.1	79	78.6	78.8	81.6	84.4	85.9	90	90.8	86.9	83.3	81.5	83.3	A
Average Relative Humidity - 1500LST (%)	71.6	68.7	63	56.8	57	59.6	59.1	60.5	63	63.9	69.1	72.6	63.7	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)	100.6	100.7	100.6	100.4	100.4	100.3	100.4	100.6	100.7	100.7	100.6	100.6	100.6	A
Average Sea Level Pressure (kPa)	101.7	101.8	101.7	101.5	101.5	101.4	101.4	101.6	101.7	101.7	101.7	101.7	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	14.4	14.6	11.5	4.5	3.3	3.6	1.5	3.5	4.8	10.9	8.2	12.3	93.2	C
1 to 9 km	131.8	106.1	92.3	60	63.8	72.4	79.2	88.9	86.4	73.2	91.7	122.9	1068.5	C
> 9 km	597.7	556.3	640.3	655.5	677	644.1	663.3	651.6	628.8	659.9	620.1	608.8	7603.3	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	158	162.5	226.9	190	196.6	197.6	219	239	235.6	196.9	136.1	146	2,304	C
3 to 7 tenths	101.6	106	115.9	135.9	163	180.9	221.4	205.1	164.4	149.1	113.2	107.1	1763.6	C
8 to 10 tenths	484.4	408.4	401.3	394.1	384.4	341.6	303.7	299.9	320	398	470.7	490.9	4697.4	C

Frost-Free

1981 to 2010 Canadian Climate Normals station data
Frost-Free
	Date/Days	Code
Average Date of Last Spring Frost	May 01	A
Average Date of First Fall Frost	Oct 08	A
Average Length of Frost-Free Period	158 Days	A

1981 to 2010 Canadian Climate Normals station data
Frost-Free
Probability of last temperature in spring <= 0°C, on or after (Date)	10%	25%	33%	50%	66%	75%	90%
Date	May 17	May 09	May 08	May 04	Apr 28	Apr 26	Apr 18
Probability of first temperature in fall <= 0°C, on or before (Date)	10%	25%	33%	50%	66%	75%	90%
Date	Sep 25	Sep 29	Oct 04	Oct 07	Oct 11	Oct 13	Oct 20
Probability of frost-free period equal to or less than indicated period (Days)	10%	25%	33%	50%	66%	75%	90%
Days	137	147	150	157	161	166	173

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
+ = Most recent occurrence of the extreme value

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.

TRENTON A

Province/Territory

Latitude (dd mm):

44 07 N

Country

CAN

Longitude (ddd mm):

77 31 W

Time Zone

EST

Latitude (decimal degrees):

44.12 N

Climate ID:

6158875

Longitude (decimal degrees):

77.53 W

WMO ID:

71621

Elevation (m):

86.3

TC ID:

YTR

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	1	10895	100
Standard Deviation	1981	2010	30	1	10895	100
Daily Maximum (°C)	1981	2010	30	1	10895	100
Daily Minimum (°C)	1981	2010	30	1	10895	100
Extreme Maximum (°C)	1935	2010			26741	99.5
Extreme Minimum (°C)	1935	2010			26761	99.6

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	10865	99.7
Snowfall (cm)	1981	2010	30	1	10865	99.7
Precipitation (mm)	1981	2010	30	1	10865	99.7
Average Snow Depth (cm)	1981	2010	30	1	10892	100
Median Snow Depth (cm)	1981	2010	30	1	10892	100
Snow Depth at Month-end (cm)	1981	2010	30	1	358	100
Extreme Daily Rainfall (mm)	1935	2010			26960	100
Extreme Daily Snowfall (cm)	1935	2010			26888	99.9
Extreme Daily Precipitation (mm)	1935	2010			26884	99.9
Extreme Snow Depth (cm)	1955	2010			20389	100

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	10865	99.7
> 0 °C	1981	2010	30	1	10865	99.7
> 10 °C	1981	2010	30	1	10865	99.7
> 20 °C	1981	2010	30	1	10865	99.7
> 30 °C	1981	2010	30	1	10865	99.7
> 35 °C	1981	2010	30	1	10865	99.7

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	10865	99.7
<= 2 °C	1981	2010	30	1	10865	99.7
<= 0 °C	1981	2010	30	1	10865	99.7
< -2 °C	1981	2010	30	1	10865	99.7
< -10 °C	1981	2010	30	1	10865	99.7
< -20 °C	1981	2010	30	1	10865	99.7
< - 30 °C	1981	2010	30	1	10865	99.7

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	10865	99.7
>= 5 mm	1981	2010	30	1	10865	99.7
>= 10 mm	1981	2010	30	1	10865	99.7
>= 25 mm	1981	2010	30	1	10865	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	10865	99.7
>= 5 cm	1981	2010	30	1	10865	99.7
>= 10 cm	1981	2010	30	1	10865	99.7
>= 25 cm	1981	2010	30	1	10865	99.7

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	10865	99.7
>= 5 mm	1981	2010	30	1	10865	99.7
>= 10 mm	1981	2010	30	1	10865	99.7
>= 25 mm	1981	2010	30	1	10865	99.7

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	10834	99.4
>= 5 cm	1981	2010	30	1	10834	99.4
>= 10 cm	1981	2010	30	1	10834	99.4
>= 20 cm	1981	2010	30	1	10834	99.4

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	1	261210	99.3
Most Frequent Direction	1981	2010	30	1	261210	99.9
Maximum Hourly Speed (km/h)	1953	2010			507704	99.9
Maximum Gust Speed (km/h)	1955	2010			20031	99.6
Days with Winds >= 52 km/h	1981	2010	30	2	10530	98.8
Days with Winds >= 63 km/h	1981	2010	30	2	10499	98.5

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	10865	99.7
Above 18 °C	1981	2010	30	1	10865	99.7
Above 15 °C	1981	2010	30	1	10865	99.7
Above 10 °C	1981	2010	30	1	10865	99.7
Above 5 °C	1981	2010	30	1	10865	99.7
Above 0 °C	1981	2010	30	1	10865	99.7
Below 0 °C	1981	2010	30	1	10865	99.7
Below 5 °C	1981	2010	30	1	10865	99.7
Below 10 °C	1981	2010	30	1	10865	99.7
Below 15 °C	1981	2010	30	1	10865	99.7
Below 18 °C	1981	2010	30	1	10865	99.7

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	1953	2010			507563	99.8
Days with Humidex >= 30	1981	2010	30	1	261210	99.3
Days with Humidex >= 35	1981	2010	30	1	261210	99.3
Days with Humidex >= 40	1981	2010	30	1	261210	99.3

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)	1953	2010			507703	99.9
Days with Wind Chill < -20	1981	2010	30	1	261209	99.3
Days with Wind Chill < -30	1981	2010	30	1	261209	99.3
Days with Wind Chill < -40	1981	2010	30	1	261209	99.3

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	261210	99.3
Average Relative Humidity - 0600LST (%)	1981	2010	30	0	10945	99.9
Average Relative Humidity - 1500LST (%)	1981	2010	30	0	10952	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	261208	99.3
Average Sea Level Pressure (kPa)	1981	2010	30	1	261194	99.3

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	28	4	214728	81.7
1 to 9 km	1981	2010	28	4	214728	81.7
> 9 km	1981	2010	28	4	214728	81.7

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	28	4	215472	81.9
3 to 7 tenths	1981	2010	28	4	215472	81.9
8 to 10 tenths	1981	2010	28	4	215472	81.9

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	2009	27	1	27	93.1
Average Date of First Fall Frost	1981	2009	27	1	27	93.1
Average Length of Frost-Free Period	1981	2009	27	1	27	93.1
Probability of last temperature in spring <= 0°C, on or after (Date)
10 %	1948	2009			60	96.8
25 %	1948	2009			60	96.8
33 %	1948	2009			60	96.8
50 %	1948	2009			60	96.8
66 %	1948	2009			60	96.8
75 %	1948	2009			60	96.8
90 %	1948	2009			60	96.8
Probability of first temperature in fall <= 0°C, on or before (Date)
10 %	1948	2009			60	96.8
25 %	1948	2009			60	96.8
33 %	1948	2009			60	96.8
50 %	1948	2009			60	96.8
66 %	1948	2009			60	96.8
75 %	1948	2009			60	96.8
90 %	1948	2009			60	96.8
Probability of frost-free period equal to or less than indicated period (Days)
10 %	1948	2009			60	96.8
25 %	1948	2009			60	96.8
33 %	1948	2009			60	96.8
50 %	1948	2009			60	96.8
66 %	1948	2009			60	96.8
75 %	1948	2009			60	96.8
90 %	1948	2009			60	96.8

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Date modified:: 2024-10-01

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Canadian Climate Normals 1981-2010 Station Data

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

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Canadian Climate Normals 1981-2010 Station Data

Temperature and Precipitation Graph for 1981 to 2010 Canadian Climate NormalsTRENTON A

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