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.

SARNIA AIRPORT *
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)-4.8-3.70.66.912.718.221.120.016.410.14.3-1.88.3A
Standard Deviation2.92.31.91.51.91.41.31.31.41.31.62.91.0A
Daily Maximum (°C)-1.20.24.912.018.323.826.425.221.714.78.01.513.0A
Daily Minimum (°C)-8.3-7.5-3.61.77.112.615.814.811.05.30.6-5.13.7A
Extreme Maximum (°C)15.019.425.631.232.939.137.337.934.429.423.318.0
Date (yyyy/dd)1995/ 142000/ 261986/ 301990/ 251987/ 301988/ 251988/ 062001/ 081983/ 101971/ 021974/ 011998/ 06
Extreme Minimum (°C)-28.9-26.9-25.6-10.0-3.0-1.16.11.2-1.6-8.9-12.8-23.6
Date (yyyy/dd)1976/ 181978/ 041978/ 021972/ 071978/ 031972/ 111972/ 062000/ 051991/ 281972/ 201971/ 231988/ 12
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)22.926.438.066.879.783.178.578.5104.775.676.339.6770.0A
Snowfall (cm)31.024.919.14.50.00.00.00.00.00.55.926.1112.0A
Precipitation (mm)51.550.957.571.579.783.178.578.5104.776.182.463.9878.2A
Average Snow Depth (cm)7730000000032A
Median Snow Depth (cm)7610000000031A
Snow Depth at Month-end (cm)8600000000052A
Extreme Daily Rainfall (mm)29.639.046.251.241.688.572.459.495.863.854.437.6
Date (yyyy/dd)2006/ 171985/ 231974/ 042000/ 202004/ 231984/ 171997/ 011985/ 241996/ 071979/ 012005/ 151967/ 21
Extreme Daily Snowfall (cm)23.633.033.321.40.00.00.00.00.017.818.538.0
Date (yyyy/dd)1979/ 131985/ 121973/ 172005/ 241970/ 011968/ 011968/ 011968/ 011968/ 011972/ 191976/ 042000/ 11
Extreme Daily Precipitation (mm)39.839.046.251.241.688.572.459.495.863.854.437.6
Date (yyyy/dd)2006/ 171985/ 231974/ 042000/ 202004/ 231984/ 171997/ 011985/ 241996/ 071979/ 012005/ 151967/ 21
Extreme Snow Depth (cm)604338230000081753
Date (yyyy/dd)2001/ 051982/ 061973/ 181975/ 041970/ 011968/ 011968/ 011968/ 011968/ 011972/ 192002/ 272000/ 31
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 °C17.213.57.10.480000001.711.151A
> 0 °C13.814.823.929.531303131303128.419.9314.2A
> 10 °C0.881.25.816.227.9303131302510.12211A
> 20 °C000.844.511.922.329.128.518.35.10.230120.8A
> 30 °C0000.040.763.962.9100014.6A
> 35 °C000000.150.280.1200000.55A
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 °C336.219.230.430313129.928.215.55.3232.5A
<= 2 °C30.127.527.817.23.3000.040.237.219.629.2162.1A
<= 0 °C2825.224.810.80.640000.082.814.525.7132.7A
< -2 °C2522.118.45000000.658.419.599.2A
< -10 °C11.58.93.600000000.156.330.4A
< -20 °C1.20.770.08000000000.282.3A
< - 30 °C0000000000000A
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 mm54.97.512.412.610.910.910.411.412.211.57.2116.7A
>= 5 mm1.71.82.74.854.74.34.65.34.54.32.946.7A
>= 10 mm0.6511.32.12.82.42.32.53.52.62.41.324.9A
>= 25 mm0.080.150.150.240.520.680.720.681.10.350.650.125.5A
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 cm11.38.472.4000000.193941.4A
>= 5 cm1.71.51.40.160000000.231.76.6A
>= 10 cm0.460.500.380.040000000.120.542A
>= 25 cm00.040000000000.040.08A
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 mm1511.912.91412.610.910.910.411.412.213.714.2150A
>= 5 mm3.23.24.15.154.74.34.65.34.64.64.653.2A
>= 10 mm1.21.61.72.22.82.42.32.53.52.62.51.727A
>= 25 mm0.080.230.190.240.520.680.720.681.10.380.650.195.7A
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 cm21.520.511.11.60000001.312.868.8A
>= 5 cm1414.46.40.200000000.326.642A
>= 10 cm9.97.93.50.160000000.123.325A
>= 20 cm3.22.30.76000000000.887.1A
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)19.618.018.118.215.713.412.311.813.516.418.518.816.2C
Most Frequent DirectionWSSNNNNSSSSWSC
Maximum Hourly Speed (km/h)788167746556536756728393
Date (yyyy/dd)1992/ 141987/ 081985/ 041987/ 041983/ 081975/ 151974/ 041987/ 221970/ 102001/ 161978/ 171980/ 02
Direction of Maximum Hourly SpeedNWNENNSWSWSSWWSWNW
Maximum Gust Speed (km/h)100117159109115871028793106109124
Date (yyyy/dd)1982/ 231987/ 081991/ 271984/ 301998/ 311975/ 191983/ 311971/ 101987/ 302001/ 161994/ 212000/ 12
Direction of Maximum GustSWNSWSWWWWSWNWNWSWNW
Days with Winds >= 52 km/h2.12.12.21.91.10.60.40.30.61.01.92.116.2D
Days with Winds >= 63 km/h0.50.60.80.80.40.10.10.20.10.20.50.64.7D
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 °C00000.54.611.95.90.800023.7A
Above 18 °C000.12.11454.6104.878.2302.300286A
Above 15 °C000.97.134.8112.2190.1157.774.510.30.30587.9A
Above 10 °C00.1630.3107.5247.4344.8311.3194.354.88.21.11305.8A
Above 5 °C2.12.123.490.3238.8396.9499.8466.3341.5161.745.97.32276.1A
Above 0 °C18.921.577.3209.3393.1546.9654.8621.3491.5311.7140.740.73527.6A
Below 0 °C159124.757.73.600000010.796.2452A
Below 5 °C297.2246.5158.834.70.700005.165.9217.91026.7A
Below 10 °C450.1385.7296.4124.624.50.5002.953.1178.2366.61882.5A
Below 15 °C605.1526.7446.3251.4106.715.30.31.533.1163.6320.3520.52990.8A
Below 18 °C698.1611.4538.5336.4178.947.77.91578.5248.7410613.53784.5A
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
Total Hours81.7100.3139.9185.2236.6266.3299.1254.3191.3151.287.667.42060.9C
Days with measurable19.219.422.624.427.627.430.128.326.325.419.617.4287.6C
% of possible daylight hours28.033.937.946.252.258.064.358.950.944.129.924.044.0C
Extreme Daily9.610.811.613.614.815.015.014.212.810.79.88.9
Date (yyyy/dd)1995/ 281979/ 262000/ 301976/ 281990/ 301971/ 101971/ 021972/ 041991/ 021999/ 011981/ 031994/ 02
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 Humidex17.221.530.035.038.844.349.947.343.834.926.122.4
Date (yyyy/dd)1995/ 142000/ 261998/ 301990/ 251987/ 301988/ 251995/ 141988/ 021985/ 072002/ 041968/ 011998/ 06
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-41-38-30-19-7000-4-9-20-32
Date (yyyy/dd)1994/ 191976/ 021986/ 071982/ 041978/ 011968/ 031968/ 011968/ 011974/ 231974/ 211976/ 301983/ 26
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 Relative Humidity - 0600LST (%)83.582.88483.283.886.38991.590.586.684.884.785.9C
Frost-Free
1981 to 2010 Canadian Climate Normals station data
Frost-Free
Date/Days Code
Average Date of Last Spring Frost Apr 29 C
Average Date of First Fall Frost Oct 19 C
Average Length of Frost-Free Period 172 Days C
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 13May 08May 05Apr 30Apr 27Apr 25Apr 19
Probability of first temperature in fall of 0 °C or lower on or after indicated dates10%25%33%50%66%75%90%
DateSep 30Oct 10Oct 12Oct 16Oct 20Oct 26Nov 03
Probability of frost-free period equal to or less than indicated period (Days)10%25%33%50%66%75%90%
Days139161162165180183191

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.

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