Notices

What’s New in latest Release from January 14th 2021:

·       In Historical Hourly Data Report, users can switch between Local Standard Time (LST) and Universal Time Coordinates (UTC) time.

·       In Historical Hourly Data Report, we have an addition of a new column to display hourly precipitation data for the stations where the data are available, from 2001 onwards.

·       Expanded the Search Options of the Canadian Historical Weather Radar, users now able to select 24 hours (1 image every hour) image viewing duration.

Please note that the IDF dataset is available through this link: Intensity-Duration-Frequency (IDF) Files .

Canadian Climate Normals 1971-2000 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.

CHALK RIVER AECL *
ONTARIO

* This station meets WMO standards for temperature and precipitation.

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Normals Station Data
(all elements)
Temperature
1971 to 2000 Canadian Climate Normals station data
Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Daily Average (°C) -12.1 -9.8 -3.0 5.1 12.6 17.5 20.0 18.7 13.7 7.3 0.3 -7.9 5.2 A
Standard Deviation 3.0 2.7 2.4 2.0 1.9 1.3 1.1 1.2 1.2 1.7 1.6 3.4 0.9 A
Daily Maximum (°C) -7.0 -4.0 2.6 10.8 19.0 23.7 26.1 24.4 18.8 11.8 3.8 -3.6 10.5 A
Daily Minimum (°C) -17.2 -15.5 -8.6 -0.7 6.1 11.2 13.9 13.0 8.5 2.8 -3.2 -12.2 -0.2 A
Extreme Maximum (°C) 11.1 15.0 23.9 31.7 34.0 36.0 39.4 37.2 32.2 28.3 22.2 14.5
Date (yyyy/dd) 1975/ 11 1994/ 19 1977/ 30 1976/ 18 1978/ 28 1988/ 14 1977/ 20 1975/ 01 1961/ 10 1968/ 16 1961/ 03 2001/ 05
Extreme Minimum (°C) -39.0 -35.6 -32.0 -19.4 -8.9 -1.7 3.3 -3.0 -2.0 -9.0 -21.0 -38.0
Date (yyyy/dd) 1981/ 03 1962/ 02 1980/ 02 1965/ 01 1966/ 07 1964/ 05 1965/ 06 1982/ 29 1978/ 26 1992/ 20 1989/ 29 1980/ 20
Precipitation
1971 to 2000 Canadian Climate Normals station data
Precipitation
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Rainfall (mm) 14.2 8.7 31.4 51.4 80.2 88.3 86.8 82.1 84.6 76.7 48.4 16.6 669.2 A
Snowfall (cm) 43.7 37.7 30.7 9.1 1.4 0.0 0.0 0.0 0.0 2.7 24.3 45.8 195.4 A
Precipitation (mm) 56.7 45.3 62.0 60.4 81.6 88.3 86.8 82.1 84.6 79.3 72.3 60.9 860.2 A
Extreme Daily Rainfall (mm) 27.8 25.8 36.1 36.5 58.7 51.2 68.6 71.1 59.2 43.8 38.6 22.6
Date (yyyy/dd) 1997/ 04 1983/ 02 1980/ 21 1998/ 16 2000/ 08 1994/ 30 1994/ 08 1965/ 02 1999/ 29 1979/ 05 1999/ 02 1971/ 15
Extreme Daily Snowfall (cm) 28.5 35.9 40.1 17.8 13.0 0.0 0.0 0.0 0.3 16.0 31.4 28.0
Date (yyyy/dd) 1979/ 13 1997/ 21 1973/ 17 1970/ 02 1997/ 03 1963/ 01 1961/ 01 1961/ 01 1992/ 29 1997/ 26 1989/ 27 1986/ 02
Extreme Daily Precipitation (mm) 28.5 35.9 49.0 36.5 58.7 51.2 68.6 71.1 59.2 43.8 41.1 29.0
Date (yyyy/dd) 1979/ 13 1997/ 21 1973/ 17 1998/ 16 2000/ 08 1994/ 30 1994/ 08 1965/ 02 1999/ 29 1979/ 05 1974/ 20 1984/ 28
Extreme Snow Depth (cm) 51 63 68 30 0 0 0 0 0 0 12 25
Date (yyyy/dd) 2001/ 31 2001/ 06 2001/ 14 2001/ 01 1991/ 31 1983/ 01 1983/ 01 1983/ 01 1983/ 01 1983/ 01 2001/ 29 2000/ 24
Days with Maximum Temperature
1971 to 2000 Canadian Climate Normals station data
Days with Maximum Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
<= 0 °C 25.7 21.1 10.7 0.97 0.0 0.0 0.0 0.0 0.0 0.11 7.4 21.6 87.7 A
> 0 °C 5.3 7.1 20.3 29.0 31.0 30.0 31.0 31.0 30.0 30.9 22.6 9.4 277.6 A
> 10 °C 0.04 0.33 3.2 14.8 28.3 29.8 31.0 31.0 29.0 18.3 3.8 0.17 189.8 A
> 20 °C 0.0 0.0 0.17 2.6 12.6 23.3 28.9 26.0 10.7 2.1 0.0 0.0 106.4 A
> 30 °C 0.0 0.0 0.0 0.10 1.3 2.4 3.8 2.1 0.23 0.0 0.0 0.0 10.0 A
> 35 °C 0.0 0.0 0.0 0.0 0.0 0.03 0.27 0.07 0.0 0.0 0.0 0.0 0.37 A
Days with Minimum Temperature
1971 to 2000 Canadian Climate Normals station data
Days with Minimum Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
> 0 °C 0.50 0.53 3.1 12.4 27.1 29.8 31.0 30.9 28.8 20.9 7.1 1.2 193.3 A
<= 2 °C 31.0 28.2 29.7 21.5 7.5 0.60 0.0 0.13 3.2 15.0 26.2 30.7 193.8 A
<= 0 °C 30.5 27.7 27.9 17.6 3.9 0.17 0.0 0.07 1.2 10.2 22.9 29.8 172.0 A
< -2 °C 29.4 26.2 23.7 11.0 0.82 0.0 0.0 0.03 0.0 4.4 15.5 27.4 138.3 A
< -10 °C 23.5 19.9 11.7 0.79 0.0 0.0 0.0 0.0 0.0 0.0 3.2 17.0 76.1 A
< -20 °C 12.1 8.9 2.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.07 5.6 29.3 A
< - 30 °C 1.9 0.90 0.03 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.63 3.5 A
Days with Rainfall
1971 to 2000 Canadian Climate Normals station data
Days with Rainfall
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 mm 2.8 2.1 5.1 8.7 12.6 13.9 13.4 13.2 14.7 12.8 8.5 3.0 111.0 A
>= 5 mm 1.1 0.60 2.1 3.8 5.0 5.4 5.5 5.0 5.3 4.8 3.3 1.3 43.2 A
>= 10 mm 0.43 0.27 1.0 1.8 2.8 2.9 2.7 2.8 2.6 2.6 1.7 0.60 22.2 A
>= 25 mm 0.03 0.03 0.13 0.17 0.41 0.57 0.57 0.59 0.30 0.43 0.23 0.0 3.5 A
Days With Snowfall
1971 to 2000 Canadian Climate Normals station data
Days With Snowfall
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 cm 13.4 9.7 7.6 2.7 0.13 0.0 0.0 0.0 0.03 0.83 7.2 11.9 53.6 A
>= 5 cm 2.8 2.6 2.1 0.57 0.10 0.0 0.0 0.0 0.0 0.17 1.6 3.5 13.5 A
>= 10 cm 0.93 0.93 0.63 0.17 0.10 0.0 0.0 0.0 0.0 0.03 0.63 1.0 4.4 A
>= 25 cm 0.03 0.03 0.03 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.03 0.13 0.25 A
Days with Precipitation
1971 to 2000 Canadian Climate Normals station data
Days with Precipitation
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 mm 15.0 10.8 11.5 10.7 12.6 13.9 13.4 13.2 14.8 13.5 14.6 14.4 158.5 A
>= 5 mm 3.8 3.2 4.0 4.4 5.0 5.4 5.5 5.0 5.3 5.0 4.9 4.6 56.1 A
>= 10 mm 1.4 1.2 1.8 2.0 2.8 2.9 2.7 2.8 2.6 2.7 2.4 1.5 26.9 A
>= 25 mm 0.07 0.07 0.23 0.17 0.45 0.57 0.57 0.59 0.30 0.46 0.30 0.20 4.0 A
Degree Days
1971 to 2000 Canadian Climate Normals station data
Degree Days
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Above 24 °C 0 0 0 0 0.2 1.3 4.6 2.3 0 0 0 0 8.4 A
Above 18 °C 0 0 0 0.8 11.4 38.4 76 55.6 9.8 0.4 0 0 192.2 A
Above 15 °C 0 0 0 3.1 31.4 92 156.6 123 33.5 2.4 0 0 442.1 A
Above 10 °C 0 0 0.4 15.6 106.3 225.4 310.1 271.2 122.6 25.3 1.2 0 1078.1 A
Above 5 °C 0.1 0.2 6.4 61.4 236.6 373.8 465.1 425.7 260.1 97.4 13.4 0.4 1940.5 A
Above 0 °C 2.6 5.7 40.4 165.1 389.8 523.8 620.1 580.7 409.6 227.7 63.3 7.9 3036.6 A
Below 0 °C 377.9 281.9 133.5 12.7 0.1 0 0 0 0 1.9 53.8 253.8 1115.6 A
Below 5 °C 530.4 417.8 254.6 59 1.8 0.1 0 0 0.5 26.5 154 401.3 1845.9 A
Below 10 °C 685.3 558.9 403.6 163.2 26.6 1.6 0 0.5 13 109.4 291.8 555.9 2809.8 A
Below 15 °C 840.3 700.2 558.1 300.7 106.6 18.2 1.5 7.3 73.9 241.5 440.6 710.9 4000.1 A
Below 18 °C 933.3 785 651.1 388.4 179.6 54.6 13.9 32.9 140.2 332.5 530.6 803.9 4846.1 A

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 1971 and 2000 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.

CHALK RIVER AECL

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