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Canadian Climate Normals 1981-2010 Station Data

Temperature and Precipitation Graph
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Normals 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.

OTTAWA MACDONALD-CARTIER INT'L A *
ONTARIO

* This station meets WMO standards for temperature and precipitation.

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Normals Station Data
(all elements)
Temperature
1981 to 2010 Canadian Climate Normals station data
Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Daily Average (°C)-10.3-8.1-2.36.313.318.521.019.815.08.01.5-6.26.4A
Standard Deviation3.42.52.31.71.81.31.11.21.41.41.73.00.8A
Daily Maximum (°C)-5.8-3.42.511.619.024.126.525.320.412.75.4-2.311.3A
Daily Minimum (°C)-14.8-12.8-7.01.07.512.915.514.39.63.3-2.4-10.11.4A
Extreme Maximum (°C)12.912.426.731.135.836.136.737.835.127.823.916.3
Date (yyyy/dd)2005/ 132000/ 271946/ 291990/ 272010/ 261941/ 271955/ 211944/ 112002/ 091946/ 071938/ 061982/ 03
Extreme Minimum (°C)-35.6-36.1-30.6-16.7-5.6-0.15.02.6-3.0-7.8-21.7-34.4
Date (yyyy/dd)1957/ 151943/ 151950/ 031954/ 041966/ 071980/ 091946/ 151986/ 291980/ 291939/ 181940/ 291942/ 20
Precipitation
1981 to 2010 Canadian Climate Normals station data
Precipitation
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Rainfall (mm)25.018.731.163.080.192.891.985.590.182.264.533.5758.2A
Snowfall (cm)53.943.338.311.30.20.00.00.00.03.720.252.5223.5A
Precipitation (mm)65.454.364.474.580.392.891.985.590.186.181.976.4943.4A
Average Snow Depth (cm)24282010000002137A
Median Snow Depth (cm)24272000000001137A
Snow Depth at Month-end (cm)2725500000004197A
Extreme Daily Rainfall (mm)43.640.444.246.247.866.669.667.0135.476.046.236.3
Date (yyyy/dd)2010/ 251997/ 211980/ 212005/ 022008/ 311995/ 031967/ 092004/ 102004/ 091995/ 062000/ 261941/ 24
Extreme Daily Snowfall (cm)38.639.640.629.815.00.00.00.01.529.228.235.6
Date (yyyy/dd)1966/ 301954/ 161947/ 021993/ 011963/ 101939/ 011939/ 011939/ 011946/ 301988/ 221987/ 252007/ 16
Extreme Daily Precipitation (mm)43.640.444.246.247.866.669.667.0135.476.046.243.7
Date (yyyy/dd)2010/ 251997/ 211980/ 212005/ 022008/ 311995/ 031967/ 092004/ 102004/ 091995/ 062000/ 261973/ 09
Extreme Snow Depth (cm)7711913558100000204275
Date (yyyy/dd)1979/ 261971/ 241993/ 141971/ 011963/ 111955/ 011955/ 011955/ 011955/ 011997/ 271995/ 292007/ 17
Days with Maximum Temperature
1981 to 2010 Canadian Climate Normals station data
Days with Maximum Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
<= 0 °C23.719.5100.70000000518.677.5A
> 0 °C7.38.72129.33130313130312512.4287.7A
> 10 °C0.170.133.51729.930313129.620.660.60199.5A
> 20 °C000.173.312.724.229.628.215.23.100116.4A
> 30 °C0000.100.702.94.83.60.8700013A
> 35 °C00000.030.030.130.170.030000.39A
Days with Minimum Temperature
1981 to 2010 Canadian Climate Normals station data
Days with Minimum Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
> 0 °C0.931.14.517.430.330313129.723.79.41.4210.4A
<= 2 °C30.827.929.618.42.60000.9712.825.530.7179.1A
<= 0 °C30.127.126.512.60.670000.307.320.629.6154.9A
< -2 °C29.125.922.66.60.070000.032.814.526.8128.5A
< -10 °C22.7199.20.370000001.914.767.9A
< -20 °C8.64.20.76000000002.716.3A
< - 30 °C0.4000000000000.070.47A
Days with Rainfall
1981 to 2010 Canadian Climate Normals station data
Days with Rainfall
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 mm4.43.96.710.913.413.211.91112.313.7116118.4A
>= 5 mm1.61.22.144.95.85.44.85.154.22.346.5A
>= 10 mm0.870.57122.72.93.12.83.22.72.11.225.2A
>= 25 mm0.130.070.100.330.470.730.770.670.600.470.430.134.9A
Days With Snowfall
1981 to 2010 Canadian Climate Normals station data
Days With Snowfall
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 cm16.112.18.83.50.1700001.16.814.763.3A
>= 5 cm3.92.92.60.60000000.201.23.715.1A
>= 10 cm10.931.20.27000000.100.471.35.3A
>= 25 cm0.030.100.100.03000000.030.070.030.39A
Days with Precipitation
1981 to 2010 Canadian Climate Normals station data
Days with Precipitation
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 mm16.613.112.712.413.413.211.91112.314.315.217.4163.6A
>= 5 mm4.43.54.34.64.95.85.44.85.15.15.44.958.4A
>= 10 mm1.61.622.32.72.93.12.83.22.92.62.230A
>= 25 mm0.200.170.230.400.470.730.770.670.600.500.500.275.5A
Days with Snow Depth
1981 to 2010 Canadian Climate Normals station data
Days with Snow Depth
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 1 cm30.427.823.74.3000000.53624.5117.3A
>= 5 cm2927.319.61.9000000.303.319.7101.1A
>= 10 cm25.425.615.61.2000000.071.61584.4A
>= 20 cm1615.311.80.40000000.030.507.851.8A
Wind
1981 to 2010 Canadian Climate Normals station data
Wind
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Speed (km/h)14.614.314.415.013.111.410.710.211.112.713.814.212.9A
Most Frequent DirectionWWWEWWWSWSWWWWA
Maximum Hourly Speed (km/h)727272676467546964806661
Date (yyyy/dd)1962/ 071965/ 251956/ 111985/ 071964/ 091985/ 231986/ 291961/ 111955/ 101954/ 151963/ 301982/ 28
Direction of Maximum Hourly SpeedEESWSWSWWNWSWSWENWSW
Maximum Gust Speed (km/h)100122116931351061291008510010394
Date (yyyy/dd)1996/ 271956/ 251964/ 051975/ 191959/ 111957/ 231962/ 091957/ 031955/ 101955/ 141956/ 161982/ 28
Direction of Maximum GustSWWSWSWSWWSWSWSWESWSW
Days with Winds >= 52 km/h0.90.80.90.70.50.50.40.30.10.51.11.27.9A
Days with Winds >= 63 km/h0.20.00.10.20.10.10.10.10.00.10.20.11.5A
Degree Days
1981 to 2010 Canadian Climate Normals station data
Degree Days
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Above 24 °C00000.34.17.84.30.800017.2A
Above 18 °C000111.253.5100.375.317.60.600259.7A
Above 15 °C000433116.3187.215250.2400546.7A
Above 10 °C000.921.9118.2255.7341.9304.2156.629.31.901230.6A
Above 5 °C0.50.39.480.5257.9405.5496.9459.2300.8109.719.81.32141.8A
Above 0 °C5.67.347.2195.9412.2555.5651.9614.2450.6248.683.812.53285.2A
Below 0 °C325.6236.2114.47.2000000.439.6204.6928A
Below 5 °C475.5370.4231.541.90.60000.216.6125.6348.41610.8A
Below 10 °C630.1511.2378133.2160.200691.2257.7502.12525.7A
Below 15 °C785.1652.4532.1265.385.810.80.42.849.7220.9405.8657.13,668A
Below 18 °C878.1737.1625.1352.4157386.519.1107310.5495.8750.14476.7A
Bright Sunshine
1981 to 2010 Canadian Climate Normals station data
Bright Sunshine
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Extreme Daily9.310.411.813.614.815.315.414.112.510.99.88.7
Date (yyyy/dd)1981/ 311980/ 281980/ 301980/ 211980/ 281978/ 301979/ 031978/ 051983/ 011982/ 041978/ 011980/ 04
Humidex
1981 to 2010 Canadian Climate Normals station data
Humidex
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Extreme Humidex13.912.727.235.141.844.046.047.042.533.926.118.4
Date (yyyy/dd)2005/ 131981/ 221998/ 302002/ 172010/ 261995/ 191955/ 012006/ 011953/ 042005/ 041961/ 031982/ 03
Days with Humidex >= 300.00.00.00.32.08.415.912.94.00.20.00.043.8A
Days with Humidex >= 350.00.00.00.00.43.25.64.00.80.00.00.014.0A
Days with Humidex >= 400.00.00.00.00.00.51.40.70.00.00.00.02.7A
Wind Chill
1981 to 2010 Canadian Climate Normals station data
Wind Chill
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Extreme Wind Chill-48-48-43-26-11000-6-13-30-45
Date (yyyy/dd)1968/ 081967/ 122007/ 061982/ 071966/ 071953/ 011953/ 011953/ 011980/ 291966/ 301958/ 301980/ 25
Days with Wind Chill < -2017.413.85.70.20.00.00.00.00.00.00.69.847.4A
Days with Wind Chill < -306.82.90.60.00.00.00.00.00.00.00.01.812.1A
Days with Wind Chill < -400.70.00.10.00.00.00.00.00.00.00.00.10.9A
Humidity
1981 to 2010 Canadian Climate Normals station data
Humidity
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Average Vapour Pressure (kPa)0.30.30.40.611.41.71.71.30.80.60.40.9A
Average Relative Humidity - 0600LST (%)76.574.973.773.576.181.184.487.989.686.183.581.880.8A
Average Relative Humidity - 1500LST (%)67.561.356.650.249.953.153.75559.161.668.172.259A
Pressure
1981 to 2010 Canadian Climate Normals station data
Pressure
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Average Station Pressure (kPa)100.2100.3100.2100100.199.9100100.2100.3100.3100.3100.3100.2A
Average Sea Level Pressure (kPa)101.7101.7101.7101.4101.4101.3101.4101.6101.7101.7101.7101.7101.6A
Visibility (hours with)
1981 to 2010 Canadian Climate Normals station data
Visibility (hours with)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
< 1 km12.815.414.65.23.33.63.14.88.21214.516.7114.1C
1 to 9 km141.8108.6101.271.256.864.763.276.878.177.1109144.41092.7C
> 9 km589.4553.6628.2643.7683.9651.7677.8662.5633.6654.9596.5582.97558.8C
Cloud Amount (hours with)
1981 to 2010 Canadian Climate Normals station data
Cloud Amount (hours with)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
0 to 2 tenths189199.2235.4179.7185178.1201.5211.6223.4193.9138.3156.92291.9C
3 to 7 tenths96.8102.7119128167195.1228.1214.1168.2139.1108.299.21765.6C
8 to 10 tenths458.3375.7389.6412.3392346.8314.5318.3328.4411473.54884708.1C
Frost-Free
1981 to 2010 Canadian Climate Normals station data
Frost-Free
Date/Days Code
Average Date of Last Spring Frost Apr 30 A
Average Date of First Fall Frost Oct 07 A
Average Length of Frost-Free Period 159 Days A
1981 to 2010 Canadian Climate Normals station data
Frost-Free
Probability of last temperature in spring of 0 °C or lower on or after indicated dates10%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 dates10%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
Station / Element Metadata

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.

OTTAWA MACDONALD-CARTIER INT'L A

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