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), and Elevation(m)
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
Temperature
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Temperature
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Daily Average (°C)1981201030010954100
Standard Deviation1981201030010954100
Daily Maximum (°C)1981201030010954100
Daily Minimum (°C)1981201030010954100
Extreme Maximum (°C)196020101828199.9
Extreme Minimum (°C)196020101828199.9
Precipitation
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Precipitation
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Rainfall (mm)198120103011089599.4
Snowfall (cm)198120103011089599.4
Precipitation (mm)198120103011089599.4
Average Snow Depth (cm)198120103001095099.9
Median Snow Depth (cm)198120103001095099.9
Snow Depth at Month-end (cm)1981201030135999.7
Extreme Daily Rainfall (mm)196020101827599.9
Extreme Daily Snowfall (cm)196020101827499.9
Extreme Daily Precipitation (mm)196020101827499.9
Extreme Snow Depth (cm)196020101826899.9
Days with Maximum Temperature
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Days with Maximum Temperature
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
<= 0 °C198120103011086799.2
> 0 °C198120103011086799.2
> 10 °C198120103011086799.2
> 20 °C198120103011086799.2
> 30 °C198120103011086799.2
> 35 °C198120103011086799.2
Days with Minimum Temperature
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Days with Minimum Temperature
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
> 0 °C198120103011086799.2
<= 2 °C198120103011086799.2
<= 0 °C198120103011086799.2
< -2 °C198120103011086799.2
< -10 °C198120103011086799.2
< -20 °C198120103011086799.2
< - 30 °C198120103011086799.2
Days with Rainfall
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Days with Rainfall
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
>= 0.2 mm198120103011092699.7
>= 5 mm198120103011092699.7
>= 10 mm198120103011092699.7
>= 25 mm198120103011092699.7
Days With Snowfall
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Days With Snowfall
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
>= 0.2 cm198120103011089599.4
>= 5 cm198120103011089599.4
>= 10 cm198120103011089599.4
>= 25 cm198120103011089599.4
Days with Precipitation
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Days with Precipitation
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
>= 0.2 mm198120103011089599.4
>= 5 mm198120103011089599.4
>= 10 mm198120103011089599.4
>= 25 mm198120103011089599.4
Days with Snow Depth
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Days with Snow Depth
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
>= 1 cm198120103011077698.3
>= 5 cm198120103011077698.3
>= 10 cm198120103011077698.3
>= 20 cm198120103011077698.3
Wind
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Wind
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Speed (km/h)1981201030026272399.9
Most Frequent Direction1981201030026272499.9
Maximum Hourly Speed (km/h)1961201043772599.9
Maximum Gust Speed (km/h)196120101768099.3
Days with Winds >= 52 km/h198120103021083398.9
Days with Winds >= 63 km/h198120103021083398.9
Degree Days
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Degree Days
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Above 24 °C198120103011086799.2
Above 18 °C198120103011086799.2
Above 15 °C198120103011086799.2
Above 10 °C198120103011086799.2
Above 5 °C198120103011086799.2
Above 0 °C198120103011086799.2
Below 0 °C198120103011086799.2
Below 5 °C198120103011086799.2
Below 10 °C198120103011086799.2
Below 15 °C198120103011086799.2
Below 18 °C198120103011086799.2
Bright Sunshine
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Bright Sunshine
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Total Hours1981200121118040898.1
Days with measureable1981200121118040898.1
% of possible daylight hours1981200121118040898.1
Extreme Daily1961200235684699.3
Humidex
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Humidex
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Extreme Humidex1961201043728299.8
Days with Humidex >= 301981201030126196999.6
Days with Humidex >= 351981201030126196999.6
Days with Humidex >= 401981201030126196999.6
Wind Chill
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Wind Chill
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Extreme Wind Chill1961201043739399.8
Days with Wind Chill < -201981201030126199299.6
Days with Wind Chill < -301981201030126199299.6
Days with Wind Chill < -401981201030126199299.6
Humidity
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Humidity
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Average Vapour Pressure (kPa)1981201030126196999.6
Average Relative Humidity - 0600LST (%)198120103001094699.9
Average Relative Humidity - 1500LST (%)1981201030010954100
Pressure
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Pressure
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
Average Station Pressure (kPa)1981201030126199099.6
Average Sea Level Pressure (kPa)1981201030126196199.6
Visibility (hours with)
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Visibility (hours with)
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
< 1 km1981201026821031280
1 to 9 km1981201026821031280
> 9 km1981201026821031280
Cloud Amount (hours with)
Element metadata including Begin Year, End Year, Total Number of Years, Missing Years, Total Count of Observations and % of Possible Observations
Cloud Amount (hours with)
Begin YearEnd YearTotal Number of YearsMissing YearsTotal Count of Observations% of Possible Observations
0 to 2 tenths1981201026820956879.7
3 to 7 tenths1981201026820956879.7
8 to 10 tenths1981201026820956879.7