Calculation Information for 1981 to 2010 Canadian Normals Data

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.

Metadata including Station Name, Province, Country, Time Zone, Climate Id, WMO Id, TC Id, Latitude(dd mm), Longitude(ddd mm), Latitude(decimal degrees), Longitude(decimal degrees), Elevation(m), and Station Status
Station Name: WILLIAMS LAKE A
Province: BC 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
WMO Id: 71104 Elevation (m): 939.7
TC Id: YWL Station Status: Active
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
 Begin Year End Year Total Number of Years Missing Years Total Count of Observations % of Possible Observations
Temperature:
Daily Average (°C)1981 2010 30 0 10954 100.0
Standard Deviation1981 2010 30 0 10954 100.0
Daily Maximum (°C)1981 2010 30 0 10954 100.0
Daily Minimum (°C)1981 2010 30 0 10954 100.0
Precipitation:
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
Days with Maximum Temperature:
<= 0 °C1981 2010 30 1 10867 99.2
> 0 °C1981 2010 30 1 10867 99.2
> 10 °C1981 2010 30 1 10867 99.2
> 20 °C1981 2010 30 1 10867 99.2
> 30 °C1981 2010 30 1 10867 99.2
> 35 °C1981 2010 30 1 10867 99.2
Days with Minimum Temperature:
> 0 °C1981 2010 30 1 10867 99.2
<= 2 °C1981 2010 30 1 10867 99.2
<= 0 °C1981 2010 30 1 10867 99.2
< -2 °C1981 2010 30 1 10867 99.2
< -10 °C1981 2010 30 1 10867 99.2
< -20 °C1981 2010 30 1 10867 99.2
< - 30 °C1981 2010 30 1 10867 99.2
Days with Rainfall:
>= 0.2 mm1981 2010 30 1 10926 99.7
>= 5 mm1981 2010 30 1 10926 99.7
>= 10 mm1981 2010 30 1 10926 99.7
>= 25 mm1981 2010 30 1 10926 99.7
Days With Snowfall:
>= 0.2 cm1981 2010 30 1 10895 99.4
>= 5 cm1981 2010 30 1 10895 99.4
>= 10 cm1981 2010 30 1 10895 99.4
>= 25 cm1981 2010 30 1 10895 99.4
Days with Precipitation:
>= 0.2 mm1981 2010 30 1 10895 99.4
>= 5 mm1981 2010 30 1 10895 99.4
>= 10 mm1981 2010 30 1 10895 99.4
>= 25 mm1981 2010 30 1 10895 99.4
Days with Snow Depth:
>= 1 cm1981 2010 30 1 10776 98.3
>= 5 cm1981 2010 30 1 10776 98.3
>= 10 cm1981 2010 30 1 10776 98.3
>= 20 cm1981 2010 30 1 10776 98.3
Wind:
Speed (km/h)1981 2010 30 0 262723 99.9
Most Frequent Direction1981 2010 30 0 262724 99.9
Days with Winds >= 52 km/h1981 2010 30 2 10833 98.9
Days with Winds >= 63 km/h1981 2010 30 2 10833 98.9
Degree Days:
Above 24 °C1981 2010 30 1 10867 99.2
Above 18 °C1981 2010 30 1 10867 99.2
Above 15 °C1981 2010 30 1 10867 99.2
Above 10 °C1981 2010 30 1 10867 99.2
Above 5 °C1981 2010 30 1 10867 99.2
Above 0 °C1981 2010 30 1 10867 99.2
Below 0 °C1981 2010 30 1 10867 99.2
Below 5 °C1981 2010 30 1 10867 99.2
Below 10 °C1981 2010 30 1 10867 99.2
Below 15 °C1981 2010 30 1 10867 99.2
Below 18 °C1981 2010 30 1 10867 99.2
Bright Sunshine:
Total Hours1981 2001 21 1 180408 98.1
Days with measureable1981 2001 21 1 180408 98.1
% of possible daylight hours1981 2001 21 1 180408 98.1
Humidex:
Days with Humidex >= 301981 2010 30 1 261969 99.6
Days with Humidex >= 351981 2010 30 1 261969 99.6
Days with Humidex >= 401981 2010 30 1 261969 99.6
Wind Chill:
Days with Wind Chill < -201981 2010 30 1 261992 99.6
Days with Wind Chill < -301981 2010 30 1 261992 99.6
Days with Wind Chill < -401981 2010 30 1 261992 99.6
Humidity:
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 100.0
Pressure:
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):
< 1 km1981 2010 26 8 210312 80.0
1 to 9 km1981 2010 26 8 210312 80.0
> 9 km1981 2010 26 8 210312 80.0
Cloud Amount (hours with):
0 to 2 tenths1981 2010 26 8 209568 79.7
3 to 7 tenths1981 2010 26 8 209568 79.7
8 to 10 tenths1981 2010 26 8 209568 79.7
Frost-Free:
Average Date of Last Spring Frost1981 2010 27 2 27 90.0
Average Date of First Fall Frost1981 2010 27 2 27 90.0
Average Length of Frost-Free Period1981 2010 27 2 27 90.0
Probability of last temperature in spring of 0 °C or lower on or after indicated dates
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 of 0 °C or lower on or after indicated dates
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