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Canadian Climate Normals 1971-2000

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.

NOTE!! 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.

YELLOWKNIFE A *
NORTHWEST TERRITORIES
Latitude: 62°27'46.000" N Longitude: 114°26'25.000" W Elevation: 205.70 m
Climate ID: 2204100 WMO ID: 71936 TC ID: YZF
Normals from to  
January-June January-December+Year July-December
Temperature:Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Daily Average (°C)-26.8 -23.4 -17.3 -5.3 5.6 13.5 16.8 14.2 7.1 -1.7 -13.8 -23.7 -4.6 A
Standard Deviation4.4 4.9 3.4 3 2.5 1.2 1.5 1.6 1.7 2.1 4.3 4.3 1.3 A
Daily Maximum (°C)-22.7 -18.6 -11.2 0.4 10.6 18.2 21.1 18.2 10.3 1 -9.9 -19.7 -0.2 A
Daily Minimum (°C)-30.9 -28.1 -23.3 -11 0.5 8.7 12.4 10.3 3.8 -4.4 -17.7 -27.7 -9 A
Extreme Maximum (°C)3.4 6.2 9.3 20.3 26.1 30.3 32.5 30.9 26.1 31 7.8 2.8    
Date (yyyy/dd)1985/03 1986/28 1993/23 1980/28 1948/31 1990/23 1989/16 1984/02 1951/06 1996/03 1956/23 1944/13  
Extreme Minimum (°C)-51.2 -51.2 -43.3 -40.6 -22.8 -4.4 0.6 -0.6 -9.7 -28.9 -44.4 -48.3    
Date (yyyy/dd)1947/31 1947/01 1955/02 1967/02 1959/01 1967/03 1951/12 1982/25 1983/29 1972/26 1966/27 1946/25  
Precipitation:
Rainfall (mm)0 0 0.2 2.4 14.5 26.9 35 40.9 29.5 14.7 0.2 0.2 164.5 A
Snowfall (cm)18.8 17.8 17.3 10.2 4.5 0 0 0.1 3.1 23 34.2 23 151.8 A
Precipitation (mm)14.1 12.9 13.4 10.8 19.1 26.9 35 40.9 32.9 35 23.5 16.3 280.7 A
Average Snow Depth (cm)30 35 39 24 1 0 0 0 0 2 15 24 14 A
Median Snow Depth (cm)29 35 39 26 0 0 0 0 0 2 15 25 14 A
Snow Depth at Month-end (cm)33 38 37 6 0 0 0 0 1 7 21 27 14 A
Extreme Daily Rainfall (mm)0.4 0.8 3 14.4 34 33.6 66 82.8 29.7 35.6 7.1 2.2    
Date (yyyy/dd)1997/31 1991/05 1993/23 1996/06 1957/05 1988/28 1988/22 1973/15 1982/07 1967/11 1954/21 1985/20  
Extreme Daily Snowfall (cm)14.2 23.7 16.2 13 11.2 3 0 1 15.2 16 14.7 20.2    
Date (yyyy/dd)2001/03 1982/20 1997/20 1981/07 1979/28 1967/07 1942/01 1982/23 1961/28 1975/29 1973/16 2001/17  
Extreme Daily Precipitation (mm)14.2 17.5 12.4 14.4 34 33.6 66 82.8 29.7 35.6 12.2 11.4    
Date (yyyy/dd)2001/03 1982/20 1995/12 1996/06 1957/05 1988/28 1988/22 1973/15 1982/07 1967/11 1942/22 1958/31  
Extreme Snow Depth (cm)69 76 81 69 30 0 0 0 15 33 43 58    
Date (yyyy/dd)1958/31 1958/27 1958/05 1957/01 1972/03 1955/01 1955/01 1955/01 1961/29 1959/18 1975/25 1974/30  
Days with Maximum Temperature:
<= 0 °C30.8 27.9 28.6 14.2 1.6 0 0 0 0.47 12.6 28 30.9 175.2 A
> 0 °C0.17 0.33 2.4 15.8 29.4 30 31 31 29.5 18.4 2 0.10 190 A
> 10 °C0 0 0 2.2 17.2 28.1 31 29.8 15.7 0.70 0 0 124.7 A
> 20 °C0 0 0 0.03 1.7 10.9 18.8 10.4 0.60 0.03 0 0 42.4 A
> 30 °C0 0 0 0 0 0.03 0.30 0.17 0 0.03 0 0 0.53 A
> 35 °C0 0 0 0 0 0 0 0 0 0 0 0 0 A
Days with Minimum Temperature:
> 0 °C0 0 0.03 2.3 17.7 29.8 31 30.9 24.6 6.4 0.21 0 143 A
<= 2 °C31 28.3 31 29.2 18.6 1 0.03 0.27 9.4 28.4 30 31 238.2 A
<= 0 °C31 28.3 31 27.7 13.3 0.17 0 0.07 5.4 24.6 29.8 31 222.2 A
< -2 °C31 28.3 30.9 25.5 8.3 0 0 0 1.9 18.6 29.5 31 204.9 A
< -10 °C30.7 27.8 28.7 15.1 1.1 0 0 0 0 4.5 23.6 30.3 161.6 A
< -20 °C27.6 22.3 19.6 4.5 0 0 0 0 0 0.53 11.2 24.3 110.1 A
< - 30 °C17.5 12.7 7.2 0.50 0 0 0 0 0 0 2.8 13 53.7 A
Days with Rainfall:
>= 0.2 mm0.10 0.10 0.30 1.2 5.4 7.4 9.5 10 9.8 5.9 0.52 0.13 50.5 A
>= 5 mm0 0 0 0.17 0.93 1.6 2.2 2.6 1.8 0.83 0 0 10.1 A
>= 10 mm0 0 0 0.03 0.27 0.63 0.77 1 0.80 0.27 0 0 3.8 A
>= 25 mm0 0 0 0 0 0.13 0.10 0.10 0.03 0 0 0 0.36 A
Days With Snowfall:
>= 0.2 cm12.4 10 9.3 4.7 2 0.07 0 0.07 1.7 10.5 15.9 13.6 80.2 A
>= 5 cm0.57 0.67 0.80 0.60 0.23 0 0 0 0.13 1.3 2.1 0.87 7.2 A
>= 10 cm0.13 0.10 0.13 0.07 0.07 0 0 0 0.03 0.33 0.31 0.17 1.3 A
>= 25 cm0 0 0 0 0 0 0 0 0 0 0 0 0 A
Days with Precipitation:
>= 0.2 mm11.2 9 8.2 5.4 6.7 7.5 9.5 10.1 10.8 14.2 14.4 12 118.9 A
>= 5 mm0.40 0.43 0.53 0.63 1.2 1.6 2.2 2.6 2 2.2 1 0.53 15.3 A
>= 10 mm0.03 0.07 0.10 0.10 0.40 0.63 0.77 1 0.87 0.66 0.07 0.03 4.8 A
>= 25 mm0 0 0 0 0 0.13 0.10 0.10 0.03 0 0 0 0.36 A
Days with Snow Depth:
>= 1 cm31 28.3 31 25.8 2.1 0 0 0 0.40 12 29 31 190.6 A
>= 5 cm30.9 28.3 31 24.3 0.96 0 0 0 0.33 5.5 25 30.5 176.8 A
>= 10 cm30.5 28.2 31 22.5 0.68 0 0 0 0.03 2.7 19.8 29.3 164.6 A
>= 20 cm25.6 25.6 30.2 17.3 0.07 0 0 0 0 0.62 9.4 20 128.7 A
Wind:
Speed (km/h)12.2 12.9 13.6 14.8 15.3 14.9 13.8 13.8 14.9 15.7 14.2 12 14 A
Most Frequent DirectionNW NW NW NE SE SE SE SE SE E E NW E A
Maximum Hourly Speed (km/h)72 61 61 64 64 68 64 64 72 64 64 57    
Date (yyyy/dd)1957/13 1989/26 1994/27 1960/05 1963/23 1955/19 1962/03 1973/18 1957/07 1959/15 1956/23 1999/24  
Direction of Maximum Hourly SpeedNW NW NW NW NE NW N N W NW NW NW NW  
Maximum Gust Speed (km/h)105 98 74 93 87 89 85 80 105 93 113 80    
Date (yyyy/dd)1957/15 1990/28 1994/27 1956/19 1959/22 1987/13 1962/03 1973/18 1957/07 1993/27 1956/23 1968/07  
Direction of Maximum GustW N NW SW NW W N N W NW W SE W  
Days with Winds >= 52 km/h0.2 0.1 0.1 0.2 0.1 0.1 0 0 0.3 0.4 0 0.1 1.6 A
Days with Winds >= 63 km/h0 0.1 0 0 0 0 0 0 0 0 0 0 0.2 A
Degree Days:
Above 24 °C0 0 0 0 0 0 0.3 0.1 0 0 0 0 0.4 A
Above 18 °C0 0 0 0 0.1 5.9 23.7 11.7 0 0 0 0 41.4 A
Above 15 °C0 0 0 0 1.7 26.5 73.8 38.8 0.5 0 0 0 141.3 A
Above 10 °C0 0 0 0.1 16.5 118.2 210.3 140.4 16.9 0.2 0 0 502.5 A
Above 5 °C0 0 0 4 76.3 253.8 364.9 286.6 87.8 3.6 0 0 1077 A
Above 0 °C0 0 0.4 28.1 188.8 403.5 519.9 441.4 215.1 37.7 0.5 0 1835.5 A
Below 0 °C831.4 660.5 535.4 187.2 16.6 0 0 0 2.9 90.9 415.4 735.1 3475.4 A
Below 5 °C986.4 801.8 690 313.1 59.1 0.3 0 0.2 25.5 211.8 564.9 890.1 4543.2 A
Below 10 °C1141.4 943.2 845 459.3 154.3 14.6 0.3 9 104.6 363.4 714.9 1045.1 5795 A
Below 15 °C1296.4 1084.5 1000 609.1 294.5 73 18.8 62.3 238.3 518.2 864.9 1200.1 7260.1 A
Below 18 °C1389.4 1169.3 1093 699.1 385.9 142.4 61.7 128.3 327.7 611.2 954.9 1293.1 8256 A
Bright Sunshine:
Total Hours45.3 104.1 189.2 270.6 338.1 380.1 370.2 283.7 155.5 61.8 42 24.2 2264.8 C
Days with measureable14.7 21.1 27.4 27.4 29.4 28.6 30.1 29.7 25.8 18 12.9 10.1 275.3 C
% of possible daylight hours24 42 52 60.9 61.2 64.1 63.3 57 39.8 20 19.9 15.1 43.3 C
Extreme Daily7.3 9.8 11.7 17.1 18.7 20 19.5 18 13.9 10.4 7.7 5.3   A
Date (yyyy/dd)2000/31 1978/26 1989/30 1972/23 1985/31 1977/12 1977/04 1974/01 1979/03 1993/01 1984/01 1971/05  
Humidex:
Extreme Humidex2.9 6.1 8.9 19.4 25.6 34 35.4 34 24.4 18.1 6.1 1.6    
Date (yyyy/dd)1985/03 1954/06 1993/23 1980/28 1967/29 1955/30 1997/22 1953/06 1967/15 1988/05 1970/03 1999/24  
Days with Humidex >= 300 0 0 0 0 0.1 0.8 0.6 0 0 0 0 1.5 A
Days with Humidex >= 350 0 0 0 0 0 0 0 0 0 0 0 0 A
Days with Humidex >= 400 0 0 0 0 0 0 0 0 0 0 0 0 A
Wind Chill:
Extreme Wind Chill-64 -61 -56.8 -53.2 -31.8 -11.2 -0.9 -4.8 -16.4 -36.3 -54.7 -58.9    
Date (yyyy/dd)1971/29 1957/23 1955/02 1954/06 1959/01 1967/03 1962/08 1982/25 1974/27 1984/31 1957/28 1961/17  
Days with Wind Chill < -2030.2 26.6 26.8 11.4 0.6 0 0 0 0 2.5 19.5 29.3 146.8 A
Days with Wind Chill < -3026 20.8 18.4 3.7 0 0 0 0 0 0.4 9.6 22.4 101.3 A
Days with Wind Chill < -4017.5 13.2 7.1 0.4 0 0 0 0 0 0 2.6 12.9 53.7 A
Humidity:
Average Vapour Pressure (kPa)0.1 0.1 0.1 0.3 0.5 0.8 1.1 1.1 0.8 0.5 0.2 0.1 0.5 A
Average Relative Humidity - 0600LST (%)64.4 65.4 66.1 69.9 66.7 64.9 69.1 79.6 83.6 84 78 68 71.7 C
Average Relative Humidity - 1500LST (%)63.6 61.1 54.5 52.6 45.3 44.6 46.4 53.5 62.5 75.5 76.7 67.4 58.6 A
Pressure:
Average Station Pressure (kPa)99.2 99.3 99.2 99.1 99 98.7 98.7 98.7 98.8 98.6 98.8 99 98.9 A
Average Sea Level Pressure (kPa)102 102 101.9 101.7 101.5 101.2 101.3 101.2 101.3 101.2 101.5 101.8 101.6 A
Visibility (hours with):
< 1 km6.6 5.3 2.4 2.3 2.5 2.3 1.2 1.7 3.6 16.2 14.7 6.2 64.9 C
1 to 9 km109.2 81.1 58.9 33.2 17.2 16.5 19.6 31.9 22.1 87.1 128.9 115.2 720.9 C
> 9 km628.2 591.6 682.7 684.5 724.3 701.3 723.2 710.4 694.3 640.7 576.4 622.6 7980.2 C
Cloud Amount (hours with):
0 to 2 tenths250.4 243.5 281 258.2 214.9 187.5 172.3 157.7 136.2 78.8 128 239.1 2347.6 C
3 to 7 tenths140.4 118.8 141.2 150.4 191.8 229.9 260.5 228.2 172.2 101.1 88.9 126.5 1949.9 C
8 to 10 tenths353.2 315.8 321.8 311.3 337.4 302.7 311.2 358 411.6 564.1 503.1 378.4 4468.5 C


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Date Modified: 2013-02-04

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