Canadian Climate Normals 1981-2010 Station Data

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.

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.

Metadata including Station Name, Province, Latitude, Longitude, Elevation, Climate ID, WMO ID, TC ID
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

* This station meets WMO standards for temperature and precipitation.

1981 to 2010 Canadian Climate Normals station data
 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Temperature:
Daily Average (°C)-10.3 -8.1 -2.3 6.3 13.3 18.5 21 19.8 15 8 1.5 -6.2 6.4 Legend AA
Standard Deviation3.4 2.5 2.3 1.7 1.8 1.3 1.1 1.2 1.4 1.4 1.7 3 0.8 Legend AA
Daily Maximum (°C)-5.8 -3.4 2.5 11.6 19 24.1 26.5 25.3 20.4 12.7 5.4 -2.3 11.3 Legend AA
Daily Minimum (°C)-14.8 -12.8 -7 1 7.5 12.9 15.5 14.3 9.6 3.3 -2.4 -10.1 1.4 Legend AA
Extreme Maximum (°C)12.9 12.4 26.7 31.1 35.8 36.1 36.7 37.8 35.1 27.8 23.9 16.3   Legend
Date
(yyyy/dd)
2005/ 13 2000/ 27 1946/ 29 1990/ 27 2010/ 26 1941/ 27 1955/ 21 1944/ 11 2002/ 09 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   Legend
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 18.7 31.1 63 80.1 92.8 91.9 85.5 90.1 82.2 64.5 33.5 758.2 Legend AA
Snowfall (cm)53.9 43.3 38.3 11.3 0.2 0 0 0 0 3.7 20.2 52.5 223.5 Legend AA
Precipitation (mm)65.4 54.3 64.4 74.5 80.3 92.8 91.9 85.5 90.1 86.1 81.9 76.4 943.4 Legend AA
Average Snow Depth (cm)24 28 20 1 0 0 0 0 0 0 2 13 7 Legend AA
Median Snow Depth (cm)24 27 20 0 0 0 0 0 0 0 1 13 7 Legend AA
Snow Depth at Month-end (cm)27 25 5 0 0 0 0 0 0 0 4 19 7 Legend AA
Extreme Daily Rainfall (mm)43.6 40.4 44.2 46.2 47.8 66.6 69.6 67 135.4 76 46.2 36.3   Legend
Date
(yyyy/dd)
2010/ 25 1997/ 21 1980/ 21 2005/ 02 2008/ 31 1995/ 03 1967/ 09 2004/ 10 2004/ 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 35.6   Legend
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 2007/ 16  
Extreme Daily Precipitation (mm)43.6 40.4 44.2 46.2 47.8 66.6 69.6 67 135.4 76 46.2 43.7   Legend
Date
(yyyy/dd)
2010/ 25 1997/ 21 1980/ 21 2005/ 02 2008/ 31 1995/ 03 1967/ 09 2004/ 10 2004/ 09 1995/ 06 2000/ 26 1973/ 09  
Extreme Snow Depth (cm)77 119 135 58 10 0 0 0 0 20 42 75   Legend
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 2007/ 17  
Days with Maximum Temperature:
<= 0 °C23.7 19.5 10 0.70 0 0 0 0 0 0 5 18.6 77.5 Legend AA
> 0 °C7.3 8.7 21 29.3 31 30 31 31 30 31 25 12.4 287.7 Legend AA
> 10 °C0.17 0.13 3.5 17 29.9 30 31 31 29.6 20.6 6 0.60 199.5 Legend AA
> 20 °C0 0 0.17 3.3 12.7 24.2 29.6 28.2 15.2 3.1 0 0 116.4 Legend AA
> 30 °C0 0 0 0.10 0.70 2.9 4.8 3.6 0.87 0 0 0 13 Legend AA
> 35 °C0 0 0 0 0.03 0.03 0.13 0.17 0.03 0 0 0 0.39 Legend AA
Days with Minimum Temperature:
> 0 °C0.93 1.1 4.5 17.4 30.3 30 31 31 29.7 23.7 9.4 1.4 210.4 Legend AA
<= 2 °C30.8 27.9 29.6 18.4 2.6 0 0 0 0.97 12.8 25.5 30.7 179.1 Legend AA
<= 0 °C30.1 27.1 26.5 12.6 0.67 0 0 0 0.30 7.3 20.6 29.6 154.9 Legend AA
< -2 °C29.1 25.9 22.6 6.6 0.07 0 0 0 0.03 2.8 14.5 26.8 128.5 Legend AA
< -10 °C22.7 19 9.2 0.37 0 0 0 0 0 0 1.9 14.7 67.9 Legend AA
< -20 °C8.6 4.2 0.76 0 0 0 0 0 0 0 0 2.7 16.3 Legend AA
< - 30 °C0.40 0 0 0 0 0 0 0 0 0 0 0.07 0.47 Legend AA
Days with Rainfall:
>= 0.2 mm4.4 3.9 6.7 10.9 13.4 13.2 11.9 11 12.3 13.7 11 6 118.4 Legend AA
>= 5 mm1.6 1.2 2.1 4 4.9 5.8 5.4 4.8 5.1 5 4.2 2.3 46.5 Legend AA
>= 10 mm0.87 0.57 1 2 2.7 2.9 3.1 2.8 3.2 2.7 2.1 1.2 25.2 Legend AA
>= 25 mm0.13 0.07 0.10 0.33 0.47 0.73 0.77 0.67 0.60 0.47 0.43 0.13 4.9 Legend AA
Days With Snowfall:
>= 0.2 cm16.1 12.1 8.8 3.5 0.17 0 0 0 0 1.1 6.8 14.7 63.3 Legend AA
>= 5 cm3.9 2.9 2.6 0.60 0 0 0 0 0 0.20 1.2 3.7 15.1 Legend AA
>= 10 cm1 0.93 1.2 0.27 0 0 0 0 0 0.10 0.47 1.3 5.3 Legend AA
>= 25 cm0.03 0.10 0.10 0.03 0 0 0 0 0 0.03 0.07 0.03 0.39 Legend AA
Days with Precipitation:
>= 0.2 mm16.6 13.1 12.7 12.4 13.4 13.2 11.9 11 12.3 14.3 15.2 17.4 163.6 Legend AA
>= 5 mm4.4 3.5 4.3 4.6 4.9 5.8 5.4 4.8 5.1 5.1 5.4 4.9 58.4 Legend AA
>= 10 mm1.6 1.6 2 2.3 2.7 2.9 3.1 2.8 3.2 2.9 2.6 2.2 30 Legend AA
>= 25 mm0.20 0.17 0.23 0.40 0.47 0.73 0.77 0.67 0.60 0.50 0.50 0.27 5.5 Legend AA
Days with Snow Depth:
>= 1 cm30.4 27.8 23.7 4.3 0 0 0 0 0 0.53 6 24.5 117.3 Legend AA
>= 5 cm29 27.3 19.6 1.9 0 0 0 0 0 0.30 3.3 19.7 101.1 Legend AA
>= 10 cm25.4 25.6 15.6 1.2 0 0 0 0 0 0.07 1.6 15 84.4 Legend AA
>= 20 cm16 15.3 11.8 0.40 0 0 0 0 0 0.03 0.50 7.8 51.8 Legend AA
Wind:
Speed (km/h)14.6 14.3 14.4 15 13.1 11.4 10.7 10.2 11.1 12.7 13.8 14.2 12.9 Legend AA
Most Frequent DirectionW W W E W W W SW S W W W W Legend AA
Maximum Hourly Speed (km/h)72 72 72 67 64 67 54 69 64 80 66 61   Legend
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  
Direction of Maximum Hourly SpeedE E SW SW SW W NW SW SW E NW SW E Legend
Maximum Gust Speed (km/h)100 122 116 93 135 106 129 100 85 100 103 94   Legend
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 Legend
Days with Winds >= 52 km/h0.9 0.8 0.9 0.7 0.5 0.5 0.4 0.3 0.1 0.5 1.1 1.2 7.9 Legend AA
Days with Winds >= 63 km/h0.2 0 0.1 0.2 0.1 0.1 0.1 0.1 0 0.1 0.2 0.1 1.5 Legend AA
Degree Days:
Above 24 °C0 0 0 0 0.3 4.1 7.8 4.3 0.8 0 0 0 17.2 Legend AA
Above 18 °C0 0 0 1 11.2 53.5 100.3 75.3 17.6 0.6 0 0 259.7 Legend AA
Above 15 °C0 0 0 4 33 116.3 187.2 152 50.2 4 0 0 546.7 Legend AA
Above 10 °C0 0 0.9 21.9 118.2 255.7 341.9 304.2 156.6 29.3 1.9 0 1230.6 Legend AA
Above 5 °C0.5 0.3 9.4 80.5 257.9 405.5 496.9 459.2 300.8 109.7 19.8 1.3 2141.8 Legend AA
Above 0 °C5.6 7.3 47.2 195.9 412.2 555.5 651.9 614.2 450.6 248.6 83.8 12.5 3285.2 Legend AA
Below 0 °C325.6 236.2 114.4 7.2 0 0 0 0 0 0.4 39.6 204.6 928 Legend AA
Below 5 °C475.5 370.4 231.5 41.9 0.6 0 0 0 0.2 16.6 125.6 348.4 1610.8 Legend AA
Below 10 °C630.1 511.2 378 133.2 16 0.2 0 0 6 91.2 257.7 502.1 2525.7 Legend AA
Below 15 °C785.1 652.4 532.1 265.3 85.8 10.8 0.4 2.8 49.7 220.9 405.8 657.1 3668 Legend AA
Below 18 °C878.1 737.1 625.1 352.4 157 38 6.5 19.1 107 310.5 495.8 750.1 4476.7 Legend AA
Bright Sunshine:
Extreme Daily9.3 10.4 11.8 13.6 14.8 15.3 15.4 14.1 12.5 10.9 9.8 8.7   Legend
Date
(yyyy/dd)
1981/ 31 1980/ 28 1980/ 30 1980/ 21 1980/ 28 1978/ 30 1979/ 03 1978/ 05 1983/ 01 1982/ 04 1978/ 01 1980/ 04  
Humidex:
Extreme Humidex13.9 12.7 27.2 35.1 41.8 44 46 47 42.5 33.9 26.1 18.4   Legend
Date
(yyyy/dd)
2005/ 13 1981/ 22 1998/ 30 2002/ 17 2010/ 26 1995/ 19 1955/ 01 2006/ 01 1953/ 04 2005/ 04 1961/ 03 1982/ 03  
Days with Humidex >= 300 0 0 0.3 2 8.4 15.9 12.9 4 0.2 0 0 43.8 Legend AA
Days with Humidex >= 350 0 0 0 0.4 3.2 5.6 4 0.8 0 0 0 14 Legend AA
Days with Humidex >= 400 0 0 0 0 0.5 1.4 0.7 0 0 0 0 2.7 Legend AA
Wind Chill:
Extreme Wind Chill-47.8 -47.6 -42.7 -26.3 -10.9 0 0 0 -6.4 -13.3 -29.5 -44.6   Legend
Date
(yyyy/dd)
1968/ 08 1967/ 12 2007/ 06 1982/ 07 1966/ 07 1953/ 01 1953/ 01 1953/ 01 1980/ 29 1966/ 30 1958/ 30 1980/ 25  
Days with Wind Chill < -2017.4 13.8 5.7 0.2 0 0 0 0 0 0 0.6 9.8 47.4 Legend AA
Days with Wind Chill < -306.8 2.9 0.6 0 0 0 0 0 0 0 0 1.8 12.1 Legend AA
Days with Wind Chill < -400.7 0 0.1 0 0 0 0 0 0 0 0 0.1 0.9 Legend AA
Humidity:
Average Vapour Pressure (kPa)0.3 0.3 0.4 0.6 1 1.4 1.7 1.7 1.3 0.8 0.6 0.4 0.9 Legend AA
Average Relative Humidity - 0600LST (%)76.5 74.9 73.7 73.5 76.1 81.1 84.4 87.9 89.6 86.1 83.5 81.8 80.8 Legend AA
Average Relative Humidity - 1500LST (%)67.5 61.3 56.6 50.2 49.9 53.1 53.7 55 59.1 61.6 68.1 72.2 59 Legend AA
Pressure:
Average Station Pressure (kPa)100.2 100.3 100.2 100 100.1 99.9 100 100.2 100.3 100.3 100.3 100.3 100.2 Legend AA
Average Sea Level Pressure (kPa)101.7 101.7 101.7 101.4 101.4 101.3 101.4 101.6 101.7 101.7 101.7 101.7 101.6 Legend AA
Visibility (hours with):
< 1 km12.8 15.4 14.6 5.2 3.3 3.6 3.1 4.8 8.2 12 14.5 16.7 114.1 Legend CC
1 to 9 km141.8 108.6 101.2 71.2 56.8 64.7 63.2 76.8 78.1 77.1 109 144.4 1092.7 Legend CC
> 9 km589.4 553.6 628.2 643.7 683.9 651.7 677.8 662.5 633.6 654.9 596.5 582.9 7558.8 Legend CC
Cloud Amount (hours with):
0 to 2 tenths189 199.2 235.4 179.7 185 178.1 201.5 211.6 223.4 193.9 138.3 156.9 2291.9 Legend CC
3 to 7 tenths96.8 102.7 119 128 167 195.1 228.1 214.1 168.2 139.1 108.2 99.2 1765.6 Legend CC
8 to 10 tenths458.3 375.7 389.6 412.3 392 346.8 314.5 318.3 328.4 411 473.5 488 4708.1 Legend CC
1981 to 2010 Canadian Climate Normals station data (Frost-Free)
Frost-Free:Code
Average Date of Last Spring Frost April 30 LegendAA
Average Date of First Fall Frost October 07 LegendAA
Average Length of Frost-Free Period 159 Days LegendAA
Probability of last temperature in spring of 0 °C or lower on or after indicated dates 10% 25% 33% 50% 66% 75% 90%
DateMay 20May 13May 11May 07Apr 29Apr 27Apr 19
Probability of first temperature in fall of 0 °C or lower on or after indicated dates 10% 25% 33% 50% 66% 75% 90%
DateSep 24Sep 28Sep 29Oct 02Oct 06Oct 09Oct 15
Probability of frost-free period equal to or less than indicated period (Days) 10% 25% 33% 50% 66% 75% 90%
Days130140144152158161167
Legend
  • A = WMO "3 and 5 rule" (i.e. no more than 3 consecutive and no more than 5 total missing for either temperature or precipitation)
  • B = At least 25 years
  • C = At least 20 years
  • D = At least 15 years