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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.

CHATHAM WPCP
ONTARIO

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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)-3.6-2.41.98.514.620.322.621.617.811.35.2-0.99.8C
Standard Deviation2.82.41.81.42.01.41.21.41.21.31.83.01.2C
Daily Maximum (°C)-0.31.26.013.519.925.527.726.522.715.58.52.114.1C
Daily Minimum (°C)-6.9-5.9-2.23.69.415.017.516.713.06.91.8-3.95.4C
Extreme Maximum (°C)14.019.025.030.032.538.537.536.533.529.022.519.0
Date (yyyy/dd)1995/ 132000/ 261998/ 301990/ 251987/ 291988/ 251988/ 072001/ 081991/ 151997/ 071990/ 011998/ 06
Extreme Minimum (°C)-27.0-23.5-22.0-8.0-2.51.56.06.01.5-4.5-10.0-23.0
Date (yyyy/dd)1994/ 191994/ 102003/ 031995/ 051986/ 031986/ 251986/ 011986/ 281991/ 281988/ 301986/ 101983/ 30
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)31.636.548.678.379.777.985.479.389.170.775.051.1803.1C
Snowfall (cm)31.117.611.31.40.00.00.00.00.00.01.715.979.2C
Precipitation (mm)62.754.159.979.779.777.985.479.389.170.776.867.0882.3C
Extreme Daily Rainfall (mm)34.049.234.667.043.266.486.167.284.856.832.034.2
Date (yyyy/dd)2006/ 171998/ 171997/ 132003/ 301996/ 091983/ 271983/ 291985/ 141990/ 061995/ 051995/ 102000/ 16
Extreme Daily Snowfall (cm)26.020.015.04.50.00.00.00.00.01.05.218.0
Date (yyyy/dd)2004/ 141985/ 121999/ 052003/ 071984/ 011983/ 011983/ 011983/ 011983/ 011989/ 181997/ 132004/ 22
Extreme Daily Precipitation (mm)38.049.234.667.043.266.486.167.284.856.832.034.2
Date (yyyy/dd)2006/ 171998/ 171997/ 132003/ 301996/ 091983/ 271983/ 291985/ 141990/ 061995/ 051995/ 102000/ 16
Extreme Snow Depth (cm)4440253000000722
Date (yyyy/dd)1999/ 151985/ 141999/ 071994/ 071984/ 011983/ 011983/ 011983/ 011983/ 011983/ 011996/ 282004/ 26
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 °C16.212.35.60.100000001.410.345.8C
> 0 °C14.81625.429.931303131303128.620.7319.4C
> 10 °C1.11.37.120.630.230313129.926.111.11.8221.2C
> 20 °C000.674.214.12630.730215.30.220132.1C
> 30 °C000014.96.53.70.8300017C
> 35 °C000000.090.330.1300000.55C
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 °C4.13.89.222.530.93031313029.318.26.9246.9C
<= 2 °C29.62725.712.71.10.04000.14517.628146.9C
<= 0 °C26.924.521.87.50.0900001.711.824.1118.3C
< -2 °C22.319.414.32.50.0400000.085.616.380.4C
< -10 °C9.56.5200000000522.9C
< -20 °C0.820.300.04000000000.261.4C
< - 30 °C0000000000000C
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 mm5.45.28.413.113.310.99.79.610.211.911.98.3118C
>= 5 mm2.12.33.65.35.24.54.44.354.453.349.3C
>= 10 mm1.11.31.52.52.52.82.62.72.92.12.71.826.5C
>= 25 mm0.180.260.130.350.570.500.880.740.830.500.430.255.6C
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 cm7.54.73.50.83000000.040.88522.4C
>= 5 cm1.91.20.7000000000.040.794.6C
>= 10 cm0.680.480.30000000000.381.8C
>= 25 cm0.09000000000000.09C
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 mm12.59.31113.513.310.99.79.610.211.912.612.7137.1C
>= 5 mm43.54.45.35.24.54.44.354.45.14.154.1C
>= 10 mm1.81.81.82.62.52.82.62.72.92.12.72.228.4C
>= 25 mm0.270.260.130.350.570.500.880.740.830.500.430.255.7C
Wind
1981 to 2010 Canadian Climate Normals station data
Wind
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Maximum Hourly Speed (km/h)646158776361434550646674
Date (yyyy/dd)1990/ 251987/ 081985/ 121988/ 171990/ 101990/ 031985/ 251990/ 281990/ 251990/ 181994/ 281985/ 02
Direction of Maximum Hourly SpeedSWNWNWSWSWSWSWSWSWSWSWSW
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 °C00001.211.120.2122.200046.7C
Above 18 °C000.12.822.491.7144.6117.250.24.500433.5C
Above 15 °C0019.553164.7235.4205.7107.317.20.30794.1C
Above 10 °C0.10.1740.4154.3308.9390.3360.4239.175.613.10.51589.9C
Above 5 °C3.73.930.8123.2301.2458.9545.3515.4387.7196.3596.52631.9C
Above 0 °C26.930.5100255.5456.1608.9700.3670.4537.7348.7162.9483945.9C
Below 0 °C137.896.940.91.30000007.881.2365.8C
Below 5 °C269.7211.6126.6190.100002.653.8194.7878.1C
Below 10 °C421.1349.1257.986.28.30001.536.9157.9343.71662.4C
Below 15 °C576490.3406.9205.361.95.80.10.319.6133.5295.1498.22,693C
Below 18 °C669575.1498.9288.6124.322.82.44.852.5213.8384.8591.23428.1C
Frost-Free
1981 to 2010 Canadian Climate Normals station data
Frost-Free
Date/Days Code
Average Date of Last Spring Frost Apr 24 D
Average Date of First Fall Frost Oct 26 D
Average Length of Frost-Free Period 185 Days D
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 03Apr 29Apr 27Apr 24Apr 20Apr 18Apr 12
Probability of first temperature in fall of 0 °C or lower on or after indicated dates10%25%33%50%66%75%90%
DateOct 08Oct 13Oct 19Oct 29Nov 03Nov 05Nov 11
Probability of frost-free period equal to or less than indicated period (Days)10%25%33%50%66%75%90%
Days160173178186192196204

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.

CHATHAM WPCP

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