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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 MACDONALD-CARTIER INT'L A *
ONTARIO
Latitude: 45°19'21.000" N Longitude: 75°40'09.000" W Elevation: 114.00 m
Climate ID: 6106000 WMO ID: 71628 TC ID: YOW
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)-10.8 -8.7 -2.5 5.7 13.4 18.3 20.9 19.5 14.3 7.8 1 -7.1 6 A
Standard Deviation2.9 2.7 2.4 1.9 1.9 1.3 1.1 1.1 1.3 1.5 1.7 3.2 0.8 A
Daily Maximum (°C)-6.1 -4.1 2.2 10.8 19.1 23.8 26.5 24.9 19.5 12.5 4.8 -3 10.9 A
Daily Minimum (°C)-15.3 -13.3 -7.1 0.6 7.7 12.7 15.4 14.1 9.1 3 -2.8 -11.1 1.1 A
Extreme Maximum (°C)12 12.4 26.7 31.1 32.8 36.1 36.7 37.8 35 27.8 23.9 16.3    
Date (yyyy/dd)1996/19 2000/27 1946/29 1990/27 1944/31 1941/27 1955/21 1944/11 1953/04 1946/07 1938/06 1982/03  
Extreme Minimum (°C)-35.6 -36.1 -30.6 -16.7 -5.6 -0.1 5 2.6 -3 -7.8 -21.7 -34.4    
Date (yyyy/dd)1957/15 1943/15 1950/03 1954/04 1966/07 1980/09 1946/15 1986/29 1980/29 1939/18 1940/29 1942/20  
Precipitation:
Rainfall (mm)25.2 17.6 36.3 60.5 78.4 85 90.6 87.1 85.3 74.9 59.8 31.3 732 A
Snowfall (cm)55.2 46 39.8 11 0.6 0 0 0 0 4.1 21.9 57.2 235.7 A
Precipitation (mm)70.2 58.9 73.9 72.4 79 85 90.6 87.1 85.3 79.4 80.1 81.5 943.5 A
Average Snow Depth (cm)27 32 23 2 0 0 0 0 0 0 2 14 8 A
Median Snow Depth (cm)27 32 23 1 0 0 0 0 0 0 1 13 8 A
Snow Depth at Month-end (cm)30 30 7 0 0 0 0 0 0 0 5 24 8 A
Extreme Daily Rainfall (mm)33.6 40.4 44.2 42.4 42.9 66.6 69.6 66.7 80 76 46.2 36.3    
Date (yyyy/dd)1995/15 1997/21 1980/21 1956/15 1943/25 1995/03 1967/09 1981/05 1942/09 1995/06 2000/26 1941/24  
Extreme Daily Snowfall (cm)38.6 39.6 40.6 29.8 15 0 0 0 1.5 29.2 28.2 30.4    
Date (yyyy/dd)1966/30 1954/16 1947/02 1993/01 1963/10 1939/01 1939/01 1939/01 1946/30 1988/22 1987/25 1977/21  
Extreme Daily Precipitation (mm)34 40.4 44.2 42.4 42.9 66.6 69.6 66.7 80 76 46.2 43.7    
Date (yyyy/dd)1992/14 1997/21 1980/21 1956/15 1943/25 1995/03 1967/09 1981/05 1942/09 1995/06 2000/26 1973/09  
Extreme Snow Depth (cm)77 119 135 58 10 0 0 0 0 20 42 68    
Date (yyyy/dd)1979/26 1971/24 1993/14 1971/01 1963/11 1955/01 1955/01 1955/01 1955/01 1997/27 1995/29 1995/17  
Days with Maximum Temperature:
<= 0 °C23.5 20.2 11.1 0.83 0 0 0 0 0 0 6 19.6 81.3 A
> 0 °C7.5 8 19.9 29.2 31 30 31 31 30 31 24 11.4 284 A
> 10 °C0.07 0.13 3.3 15.5 29.5 30 31 31 29.5 20.1 5.3 0.40 195.8 A
> 20 °C0 0 0.17 2.5 12.7 24 29.7 27.5 13.2 2.6 0.03 0 112.3 A
> 30 °C0 0 0 0.03 0.93 2.5 4.6 2.8 0.47 0 0 0 11.3 A
> 35 °C0 0 0 0 0 0.03 0.10 0.03 0 0 0 0 0.16 A
Days with Minimum Temperature:
> 0 °C0.80 0.90 4.2 16.2 30.3 30 31 31 29.5 22.3 8.7 1.1 206 A
<= 2 °C30.8 27.9 29.7 19.1 2.5 0.07 0 0 1.5 13.6 26 30.8 182 A
<= 0 °C30.2 27.4 26.8 13.8 0.70 0.03 0 0 0.47 8.7 21.3 29.9 159.2 A
< -2 °C29.4 26.1 22.5 7.8 0.13 0 0 0 0.07 3.5 15.2 27.5 132.2 A
< -10 °C23.2 19.1 9.5 0.47 0 0 0 0 0 0 2.4 16.4 71 A
< -20 °C9 5.1 0.62 0 0 0 0 0 0 0 0 3.8 18.4 A
< - 30 °C0.40 0.03 0 0 0 0 0 0 0 0 0 0.07 0.50 A
Days with Rainfall:
>= 0.2 mm4.5 3.9 7.1 10.1 12.8 12.2 11.6 11.1 12.7 12.6 10.4 5.8 114.7 A
>= 5 mm1.7 1.1 2.3 4 4.8 5.3 5.4 5.1 5 4.9 3.8 2.2 45.5 A
>= 10 mm0.97 0.50 1.1 2 2.5 2.7 3 3 2.9 2.3 1.9 1.3 24.2 A
>= 25 mm0.13 0.10 0.20 0.43 0.47 0.60 0.83 0.63 0.63 0.37 0.43 0.07 4.9 A
Days With Snowfall:
>= 0.2 cm16 11.9 9.5 3.7 0.30 0 0 0 0 1.4 7.6 15.2 65.6 A
>= 5 cm4 2.8 2.6 0.53 0.03 0 0 0 0 0.20 1.3 4.1 15.6 A
>= 10 cm0.97 1.1 1.3 0.20 0 0 0 0 0 0.10 0.47 1.6 5.7 A
>= 25 cm0.07 0.17 0.07 0.07 0 0 0 0 0 0.03 0.07 0.07 0.55 A
Days with Precipitation:
>= 0.2 mm17 13.1 13.6 12 12.9 12.2 11.6 11.1 12.7 13.4 15.3 17.7 162.6 A
>= 5 mm4.9 3.6 4.5 4.6 4.9 5.3 5.4 5.1 5 5.1 5.2 5.4 58.9 A
>= 10 mm1.7 1.7 2.4 2.2 2.6 2.7 3 3 2.9 2.5 2.3 2.6 29.8 A
>= 25 mm0.23 0.40 0.40 0.53 0.47 0.60 0.83 0.63 0.63 0.43 0.50 0.23 5.9 A
Days with Snow Depth:
>= 1 cm30.4 27.9 25.5 5.9 0.03 0 0 0 0 0.50 7.2 24.6 122 A
>= 5 cm29 27.2 22.3 3.5 0 0 0 0 0 0.20 4 20.3 106.4 A
>= 10 cm25.6 25.2 18.6 2.7 0 0 0 0 0 0.07 1.6 16.5 90.3 A
>= 20 cm19.6 17.6 14.5 1.1 0 0 0 0 0 0.03 0.53 8.6 62 A
Wind:
Speed (km/h)15 14.2 14.7 15.3 12.7 11.5 10.4 9.9 11.1 12.6 13.8 14 12.9 A
Most Frequent DirectionW W W W S S S S S S W W W A
Maximum Hourly Speed (km/h)72 72 72 67 64 67 54 69 64 80 66 61    
Date (yyyy/dd)1962/07 1965/25 1956/11 1985/07 1964/09 1985/23 1986/29 1961/11 1955/10 1954/15 1963/30 1982/28  
Maximum Gust Speed (km/h)100 122 116 93 135 106 129 100 85 100 103 94    
Date (yyyy/dd)1996/27 1956/25 1964/05 1975/19 1959/11 1957/23 1962/09 1957/03 1955/10 1955/14 1956/16 1982/28  
Direction of Maximum GustSW W SW SW SW W SW SW SW E SW SW SW  
Days with Winds >= 52 km/h1.1 0.7 0.8 0.7 0.5 0.5 0.3 0.3 0.1 0.5 1 1.2 7.7 A
Days with Winds >= 63 km/h0.2 0 0.1 0.3 0.1 0.2 0.1 0.1 0 0.1 0.2 0.1 1.7 A
Degree Days:
Above 24 °C0 0 0 0 0.3 3.1 6.9 3.2 0.5 0 0 0 14 A
Above 18 °C0 0 0 0.8 13.1 49 98.5 68.6 14.2 0.4 0 0 244.6 A
Above 15 °C0 0 0 3.4 36.9 110.5 184.7 143.5 41.5 3 0 0 523.5 A
Above 10 °C0 0 0.9 18.4 122.9 248.3 339.2 294.9 139 27.4 2 0 1193 A
Above 5 °C0.2 0.3 8.6 71.6 261.7 397.7 494.2 449.9 280.2 106.1 18.3 0.8 2089.6 A
Above 0 °C4.2 6.6 43.8 181.2 416 547.7 649.2 604.9 430 241.5 76.5 9.9 3211.6 A
Below 0 °C337.6 253.4 117.8 9.4 0 0 0 0 0 0.6 47.2 228.5 994.5 A
Below 5 °C488.6 388.4 237.6 49.8 0.8 0 0 0 0.2 20.2 139 374.3 1698.9 A
Below 10 °C643.4 529.4 385 146.5 16.9 0.6 0 0 9 96.6 272.6 528.5 2628.6 A
Below 15 °C798.4 670.8 539 281.6 86 12.8 0.5 3.6 61.5 227.1 420.7 683.5 3785.5 A
Below 18 °C891.4 755.6 632 369 155.2 41.3 7.3 21.7 124.2 317.5 510.7 776.5 4602.4 A
Humidex:
Extreme Humidex13.1 12.7 27.2 35.1 38.2 44 46 45.7 42.5 33.7 26.1 18.4    
Date (yyyy/dd)1995/15 1981/22 1998/30 2002/17 1987/30 1995/19 1955/01 1988/03 1953/04 1979/22 1961/03 1982/03  
Days with Humidex >= 300 0 0 0.2 2.3 7.6 15.3 12.2 3.2 0.1 0 0 41 A
Days with Humidex >= 350 0 0 0 0.3 2.4 5.2 3.4 0.6 0 0 0 11.9 A
Days with Humidex >= 400 0 0 0 0 0.3 1.2 0.5 0.1 0 0 0 2 A
Wind Chill:
Extreme Wind Chill-47.8 -47.6 -37.8 -26.3 -10.9 -1.6 4.6 1.1 -6.4 -13.3 -29.5 -44.6    
Date (yyyy/dd)1968/08 1967/12 1989/07 1982/07 1966/07 1980/09 2001/01 1965/31 1980/29 1966/30 1958/30 1980/25  
Days with Wind Chill < -2018.5 14.5 5.9 0.3 0 0 0 0 0 0 0.6 11.6 51.5 A
Days with Wind Chill < -307.2 3.5 0.4 0 0 0 0 0 0 0 0 2.8 14 A
Days with Wind Chill < -400.7 0.2 0 0 0 0 0 0 0 0 0 0.2 1.1 A
Humidity:
Average Vapour Pressure (kPa)0.3 0.3 0.4 0.6 1 1.4 1.7 1.6 1.3 0.8 0.6 0.3 0.8 A
Average Relative Humidity - 0600LST (%)74 72.1 73 72.5 74.9 79.6 82.4 86.8 87.6 83.4 81.9 79.8 79 A
Average Relative Humidity - 1500LST (%)66.5 60.7 57.7 50.3 49.1 52.4 52.5 55.3 59.8 60.3 68.2 71.9 58.7 A
Pressure:
Average Station Pressure (kPa)100.2 100.3 100.1 100 100 99.9 100 100.2 100.2 100.3 100.2 100.3 100.1 A
Average Sea Level Pressure (kPa)101.7 101.7 101.6 101.4 101.4 101.3 101.4 101.6 101.7 101.8 101.7 101.7 101.6 A
Visibility (hours with):
< 1 km14.5 17.1 18 8.3 3.8 4.6 3.6 6.9 11.4 13.7 15.9 21 138.7 C
1 to 9 km156.2 129.1 122.7 80.7 74.8 89.8 98.3 115 113.4 95.3 131.5 168.5 1375 C
> 9 km573.4 532.1 603.2 631 665.4 625.7 642.2 622.2 595.2 634.9 572.7 554.6 7252.4 C
Cloud Amount (hours with):
0 to 2 tenths186.3 199.3 220.4 185.4 185.7 175.4 205 200.4 196.7 195.7 128.4 162.3 2240.9 C
3 to 7 tenths102.5 102 115.2 128.2 167.8 205.1 228.4 211.7 168.8 139.8 108.5 99 1777 C
8 to 10 tenths455.2 376.9 408.5 406.4 390.6 339.5 310.6 332 354.5 408.5 483.2 482.7 4748.4 C


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Date Modified: 2013-02-04

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