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Notices:

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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.

OTTAWA CDA *
ONTARIO
Latitude: 45°23'00.000" N Longitude: 75°43'00.000" W Elevation: 79.20 m
Climate ID: 6105976 WMO ID: TC ID: WCG
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)-10.5 -8.6 -2.4 6 13.6 18.4 21 19.7 14.7 8.2 1.5 -6.6 6.3 A
Standard Deviation2.9 2.7 2.5 1.9 1.8 1.3 1.1 1.1 1.2 1.6 1.7 3.3 0.8 A
Daily Maximum (°C)-6.1 -3.9 2.1 10.9 19.1 23.8 26.4 25 19.7 12.6 4.9 -2.9 11 A
Daily Minimum (°C)-14.8 -13.2 -7 1.1 8 13 15.5 14.3 9.7 3.7 -1.9 -10.3 1.5 A
Extreme Maximum (°C)11.7 12.2 25.6 31.2 35 36.7 37.8 37.8 36.7 29.4 23.3 16.1    
Date (yyyy/dd)1932/14 1953/21 1945/28 1990/27 1921/21 1921/22 1913/04 1917/01 1931/11 1891/03 1961/03 1951/07  
Extreme Minimum (°C)-37.8 -38.3 -36.7 -20.6 -7.2 0 3.3 1.7 -4.4 -12.8 -23.9 -38.9    
Date (yyyy/dd)1925/19 1934/17 1938/04 1923/01 1902/10 1910/04 1942/10 1934/30 1947/28 1933/26 1925/30 1933/29  
Precipitation:
Rainfall (mm)22.9 16.1 33.6 59.7 80.9 91.2 88.9 87.6 86.8 76.2 60.5 28.8 733.2 A
Snowfall (cm)48.7 41.2 32.1 7.5 0.2 0 0 0 0 3 18 52.2 202.7 A
Precipitation (mm)64.2 51.6 64.9 67.7 81 91.2 88.9 87.6 86.8 79.1 77 74.1 914.2 A
Average Snow Depth (cm)21 25 20 2 0 0 0 0 0 0 1 11 7 A
Median Snow Depth (cm)21 25 20 1 0 0 0 0 0 0 1 10 7 A
Snow Depth at Month-end (cm)23 26 9 0 0 0 0 0 0 0 4 16 7 A
Extreme Daily Rainfall (mm)40.1 38.4 41.8 48.3 75.9 77.5 74.2 90.4 93.2 58.4 49 73.2    
Date (yyyy/dd)1995/15 1997/21 1980/21 1956/15 1916/17 1946/17 1899/11 1943/23 1942/09 1995/05 1907/07 1933/31  
Extreme Daily Snowfall (cm)55.9 45.7 48.3 33 19.1 0 0 0 0 21.6 53.3 37.6    
Date (yyyy/dd)1894/29 1895/08 1947/02 1970/02 1907/04 1890/01 1890/01 1890/01 1890/01 1933/24 1912/25 1973/20  
Extreme Daily Precipitation (mm)55.9 45.7 48.8 48.3 75.9 77.5 74.2 90.4 93.2 58.4 53.3 73.2    
Date (yyyy/dd)1894/29 1895/08 1962/12 1956/15 1916/17 1946/17 1899/11 1943/23 1942/09 1995/05 1912/25 1933/31  
Extreme Snow Depth (cm)53 97 89 66 8 0 0 0 0 18 30 51    
Date (yyyy/dd)1971/30 1971/24 1971/12 1971/01 1963/11 1961/01 1961/01 1961/01 1961/01 1997/27 1995/28 1970/25  
Days with Maximum Temperature:
<= 0 °C23.3 19.8 10.9 0.87 0 0 0 0 0 0 5.8 19.1 79.7 A
> 0 °C7.7 8.5 20.1 29.1 31 30 31 31 30 31 24.2 11.9 285.5 A
> 10 °C0.03 0.13 3 15.3 29.5 30 31 31 29.5 20.5 5.4 0.37 195.6 A
> 20 °C0 0 0.13 2.6 12.8 24.1 29.8 27.4 13.6 2.6 0.07 0 113.2 A
> 30 °C0 0 0 0.03 0.73 2.3 4.3 2.5 0.50 0 0 0 10.3 A
> 35 °C0 0 0 0 0 0.03 0 0.03 0 0 0 0 0.06 A
Days with Minimum Temperature:
> 0 °C0.97 1.1 4.5 17.5 30.3 30 31 31 29.5 23.6 10.5 1.8 211.9 A
<= 2 °C30.9 27.9 29.5 18.5 2.5 0.07 0 0 1.5 12.3 24.3 30.4 177.9 A
<= 0 °C30 27.2 26.5 12.5 0.67 0 0 0 0.50 7.4 19.5 29.2 153.4 A
< -2 °C29 25.6 21.9 7 0.17 0 0 0 0.03 2.7 13.1 26.2 125.7 A
< -10 °C21.8 18.7 10 0.37 0 0 0 0 0 0 1.9 15.2 67.9 A
< -20 °C8.6 5.9 0.97 0 0 0 0 0 0 0 0 3.4 18.9 A
< - 30 °C0.50 0.07 0 0 0 0 0 0 0 0 0 0.10 0.67 A
Days with Rainfall:
>= 0.2 mm3.9 3.3 6.3 10.8 13.4 12.9 12.4 12 14.1 13.7 10.7 5.1 118.5 A
>= 5 mm1.5 1.1 2.1 4 5.3 5.2 5.1 4.9 5.3 4.7 3.7 2.1 45 A
>= 10 mm0.73 0.47 1 1.9 2.7 3.1 3.1 2.6 2.8 2.3 1.9 1.1 23.9 A
>= 25 mm0.23 0.07 0.20 0.30 0.37 0.80 0.70 0.83 0.63 0.47 0.40 0 5 A
Days With Snowfall:
>= 0.2 cm14.8 10.6 8.2 2.7 0.17 0 0 0 0 1.1 5.5 13.4 56.6 A
>= 5 cm3.4 2.7 2.6 0.37 0 0 0 0 0 0.10 1.2 3.6 13.9 A
>= 10 cm0.80 0.93 0.83 0.17 0 0 0 0 0 0.07 0.40 1.4 4.6 A
>= 25 cm0 0.13 0 0 0 0 0 0 0 0 0.03 0.07 0.23 A
Days with Precipitation:
>= 0.2 mm16.6 12.2 12.4 12.4 13.4 12.9 12.4 12 14.1 14.2 14.7 16.1 163.4 A
>= 5 mm4.3 3 4.3 4.6 5.3 5.2 5.1 4.9 5.3 4.9 4.7 5.2 57 A
>= 10 mm1.4 1.5 1.9 2.2 2.7 3.1 3.1 2.6 2.8 2.4 2.4 2.3 28.5 A
>= 25 mm0.23 0.17 0.23 0.30 0.37 0.80 0.70 0.83 0.63 0.47 0.43 0.10 5.3 A
Days with Snow Depth:
>= 1 cm30.3 28 25.7 5.4 0.04 0 0 0 0 0.40 5.9 23.8 119.5 A
>= 5 cm28.2 27.6 23.5 3.6 0 0 0 0 0 0.13 3.7 20.3 107.1 A
>= 10 cm24.2 24.3 20.5 2.6 0 0 0 0 0 0.03 1.6 13.8 87 A
>= 20 cm15.6 16.4 12.8 1.5 0 0 0 0 0 0 0.17 5.3 51.7 A
Degree Days:
Above 24 °C0 0 0 0 0.2 2.7 6.9 3.2 0.5 0 0 0 13.4 A
Above 18 °C0 0 0 0.9 13 51 99.8 71.6 16.4 0.5 0 0 253 A
Above 15 °C0 0 0 3.8 37.3 114.2 186.1 147.7 46.2 3.4 0 0 538.6 A
Above 10 °C0 0 0.6 19.8 125.9 253.7 340.6 299.7 148.4 31.6 2.7 0 1222.8 A
Above 5 °C0.1 0.3 8 76 266.3 403.2 495.6 454.7 291.1 115.3 21.1 0.8 2132.4 A
Above 0 °C4.7 6.9 43.7 188.6 420.7 553.2 650.6 609.7 441 254.2 85.7 12.1 3270.9 A
Below 0 °C329.8 249.1 118.9 8.5 0 0 0 0 0 0.3 39.8 217.5 963.9 A
Below 5 °C480.2 383.8 238.2 46 0.7 0 0 0 0.1 16.5 125.2 361.2 1651.7 A
Below 10 °C635.1 524.9 385.8 139.7 15.2 0.5 0 0 7.4 87.7 256.8 515.4 2568.5 A
Below 15 °C790.1 666.2 540.2 273.7 81.6 11 0.5 3 55.3 214.5 404.1 670.4 3710.6 A
Below 18 °C883.1 751 633.2 360.8 150.3 37.8 7.2 20 115.4 304.6 494.1 763.4 4520.8 A
Soil Temperature:
at 5 cm depth (AM obs) (°C)-0.2 -0.7 -0.2 3 11.1 16.6 19.1 18.2 14.2 8.3 3.5 0.5 7.8 A
at 5 cm depth (PM obs) (°C)-0.2 -0.6 0 5.2 14.4 20.2 23 21.8 17 10.3 4.1 0.5 9.6 A
at 10 cm depth (AM obs) (°C)0 -0.5 -0.1 3.2 11.2 16.7 19.2 18.4 14.6 8.8 3.8 0.8 8 A
at 10 cm depth (PM obs) (°C)0 -0.4 0 4.7 13.6 19.4 22.1 21.1 16.6 10.2 4.2 0.8 9.4 A
at 20 cm depth (AM obs) (°C)0.5 -0.1 0.3 3.4 11.5 17 19.6 19 15.3 9.7 4.6 1.4 8.5 A
at 20 cm depth (PM obs) (°C)0.5 0 0.3 4.1 12.6 18.3 21 20.2 16.2 10.2 4.8 1.4 9.1 A
at 50 cm depth (AM obs) (°C)1.1 0.3 0.3 2.5 9.8 15 17.8 17.8 15.2 10.4 5.6 2.2 8.2 A
at 100 cm depth (AM obs) (°C)2.9 2 1.6 2.5 7.6 12.3 15.2 16.2 15 11.7 7.8 4.5 8.3 A
at 150 cm depth (AM obs) (°C)5 3.9 3.3 3.5 6.8 10.7 13.6 15 14.8 12.7 9.7 6.7 8.8 C
at 300 cm depth (AM obs) (°C)7 5.9 5.1 4.6 5.7 8.1 10.4 12.1 12.9 12.3 10.7 8.7 8.6 A
Evaporation:
Lake Evaporation (mm)0 0 0 0 3.6 4.3 4.5 3.7 2.4 1.4 0 0 0 C
Bright Sunshine:
Total Hours101.2 129.8 159.8 189.4 230.3 253.3 276.8 246.7 171.5 136.7 83.6 82 2061.1 C
Days with measureable21.6 22.3 24.7 25.5 27.9 28.6 30.2 29.7 26.5 25.8 20.9 19.7 303.4 C
% of possible daylight hours35.7 44.3 43.3 46.8 50 54.1 58.4 56.5 45.5 40.2 29.1 30.1 44.5 C
Extreme Daily8.9 10.4 11.6 13.5 14.9 15.2 15 14 12.7 10.6 9.6 8.1   A
Date (yyyy/dd)1981/31 1974/26 1987/24 1974/26 1997/27 1979/25 1978/01 1978/05 1991/01 1976/01 1985/01 1979/30  
Radiation:
Extreme Global - RF1 (MJ/m2)11.4 16.7 22.6 27.9 31.3 32.5 30.8 28.8 23.6 17.2 11.7 8.7    
Date (yyyy/dd)1994/31 1994/27 1994/30 1986/23 1990/30 1987/20 1996/01 1987/01 1991/01 1992/01 1985/01 1989/01  
Extreme Net - RF4 (MJ/m2)2.6 1.8 11.8 15.3 17.7 19.3 19.3 15.7 12.5 7.8 3.7 1.7    
Date (yyyy/dd)1988/31 1986/28 1996/31 1993/14 1987/15 1987/17 1997/16 1995/07 1996/01 1995/01 1988/03 1987/10  


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Date Modified: 2013-02-04

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