James Bay Road website

Weather

Climate Archive Data - Radisson

Use this chart to get an idea of the climate of the James Bay region. This chart reproduced from the Environment Canada website Online Climate Archive. It shows Climate Normals for 1971-2000. The readings are for "LaGrande" (near Radisson, which is located at the top end of the James Bay Road).

Non-weather people may find much of this chart to be too technical for their liking. The most important and easy-to-understand data is in the bolded rows in the first two sections: temperature and precipitation.
 

 

 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Temperature:
Daily Average (°C)   -23.2   -21.6   -14.6   -4.9   4.3   10.5   13.7   12.9   7.4   1.2   -6.3   -17.1   -3.1
Standard Deviation   3.0   3.4   3.2   2.6   2.1   2.1   1.4   1.6   1.7   1.6   2.3   4.0   1.9
Daily Maximum (°C)   -18.3   -15.8   -8.2   0.7   10.3   17.1   20.0   18.4   11.6   4.4   -3.3   -13.0   2.0
Daily Minimum (°C)   -28.0   -27.4   -20.9   -10.5   -1.6   3.9   7.4   7.4   3.1   -2.0   -9.4   -21.2   -8.3
Extreme Maximum (°C)   1.4   5.0   11.3   22.3   32.6   35.0   32.3   31.2   26.8   23.5   12.3   12.5  
Date (yyyy/dd)  1993/22  2000/26  1979/21  1980/30  1998/16  1983/21  1990/15  1996/03  1996/02  1997/09  1977/03  1986/13  
Extreme Minimum (°C)   -40.9   -44.6   -38.5   -31.4   -13.5   -6.6   -0.9   -0.5   -7.0   -16.7   -29.2   -40.3  
Date (yyyy/dd)  1982/18  1979/15  1984/12  1994/01  1981/10  1986/02  1978/01  1984/17  1978/29  1990/26  1989/25  1993/28  

Precipitation:

Rainfall (mm)   0.1   1.2   3.0   11.5   30.2   62.3   79.5   85.1   100.8   52.5   10.2   1.2   437.4
Snowfall (cm)   34.2   23.3   29.5   20.9   11.1   2.5   0.0   0.1   6.4   35.5   60.8   42.5   266.7
Precipitation (mm)   31.8   21.8   29.3   31.5   40.3   64.8   79.5   85.2   106.9   86.5   66.3   40.1   683.9
Average Snow Depth (cm)  43  50  47  30  3  0  0  0  0  2  16  32  19
Median Snow Depth (cm)  43  50  47  30  2  0  0  0  0  1  16  32  18
Snow Depth at Month-end (cm)  50  49  41  13  0  0  0  0  0  6  25  37  18
Extreme Daily Rainfall (mm)   0.6   6.4   12.6   18.0   28.6   64.2   42.0   66.4   66.2   35.4   22.0   16.8  
Date (yyyy/dd)  1995/18  1994/19  1991/28  1988/06  1991/11  1977/29  1986/24  2000/16  1987/13  1995/02  2001/25  1982/03  
Extreme Daily Snowfall (cm)   21.2   17.4   22.4   16.9   16.5   9.4   0.2   2.0   12.6   25.4   25.8   17.2  
Date (yyyy/dd)  1996/19  1994/19  1984/21  1982/18  1977/06  1980/09  2001/25  1986/28  1984/25  1991/21  1985/20  1982/06  
Extreme Daily Precipitation (mm)   21.2   23.8   19.1   20.4   28.6   64.2   42.0   66.4   66.2   35.5   23.4   16.8  
Date (yyyy/dd)  1996/19  1994/19  1984/21  1997/07  1991/11  1977/29  1986/24  2000/16  1987/13  1981/18  1988/27  1982/03  
Extreme Snow Depth (cm)   102.0   110.0   99.0   88.0   61.0   4.0   0.0   1.0   10.0   38.0   59.0   61.0  
Date (yyyy/dd)  1996/31  1996/13+  1977/03+  1994/12  1994/03  1989/05  1977/01+  1986/28  1980/30  1992/21  1993/22  1992/31  

Days with Maximum Temperature:

<= 0 °C   30.9   27.3   25.3   13.2   2.1   0.09   0.0   0.0   0.0   5.3   22.6   30.2   156.9
> 0 °C   0.14   0.96   5.7   16.8   28.9   29.9   31.0   31.0   30.0   25.8   7.4   0.83   208.4
> 10 °C   0.0   0.0   0.13   2.0   15.1   25.5   30.1   30.2   17.4   3.6   0.17   0.04   124.1
> 20 °C   0.0   0.0   0.0   0.04   3.4   10.0   15.5   11.2   1.7   0.04   0.0   0.0   42.0
> 30 °C   0.0   0.0   0.0   0.0   0.08   0.70   0.43   0.24   0.0   0.0   0.0   0.0   1.5
> 35 °C   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0

Days with Minimum Temperature:

> 0 °C   0.0   0.09   0.33   2.0   10.2   21.8   30.8   30.8   23.5   8.3   1.3   0.04   129.0
<= 2 °C   31.0   28.2   31.0   29.3   24.3   13.1   2.4   1.3   13.8   27.3   29.4   31.0   262.2
<= 0 °C   31.0   28.1   30.7   28.0   20.8   8.2   0.17   0.24   6.5   22.8   28.7   31.0   236.2
< -2 °C   31.0   28.1   30.1   26.0   15.3   3.0   0.0   0.0   2.0   15.0   27.3   30.9   208.6
< -10 °C   30.2   27.3   26.9   15.4   1.4   0.0   0.0   0.0   0.0   0.46   13.0   26.6   141.1
< -20 °C   26.3   23.7   17.8   3.0   0.0   0.0   0.0   0.0   0.0   0.0   1.8   16.8   89.4
< - 30 °C   13.6   11.5   5.1   0.04   0.0   0.0   0.0   0.0   0.0   0.0   0.0   5.6   35.8

 

 

 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year

Days with Rainfall:

>= 0.2 mm   0.35   0.52   1.1   3.8   8.2   11.6   14.3   16.6   18.4   12.0   3.9   0.76   91.4
>= 5 mm   0.0   0.04   0.08   0.74   2.0   3.9   5.5   5.6   6.0   3.6   0.79   0.04   28.4
>= 10 mm   0.0   0.0   0.04   0.22   0.83   2.0   2.5   2.5   3.4   1.7   0.21   0.04   13.4
>= 25 mm   0.0   0.0   0.0   0.0   0.08   0.35   0.38   0.36   0.48   0.13   0.0   0.0   1.8

Days With Snowfall:

>= 0.2 cm   15.9   12.2   11.1   8.2   5.1   1.6   0.0   0.05   2.5   13.1   20.1   18.7   108.5
>= 5 cm   1.6   1.1   1.8   1.3   0.63   0.13   0.0   0.0   0.48   2.0   4.0   2.3   15.2
>= 10 cm   0.39   0.13   0.33   0.30   0.13   0.0   0.0   0.0   0.09   0.50   0.83   0.52   3.2
>= 25 cm   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.04   0.04   0.0   0.08

Days with Precipitation:

>= 0.2 mm   15.8   12.3   11.5   10.3   11.9   12.4   14.5   16.5   19.4   20.9   21.7   18.8   185.9
>= 5 mm   1.4   1.0   1.8   2.0   2.5   4.1   5.6   5.5   6.6   5.9   4.3   1.9   42.6
>= 10 mm   0.30   0.09   0.38   0.52   0.96   2.0   2.6   2.4   3.7   2.4   1.2   0.40   16.9
>= 25 mm   0.0   0.0   0.0   0.0   0.08   0.35   0.35   0.29   0.48   0.13   0.0   0.0   1.7

Days with Snow Depth:

>= 1 cm   31.0   28.3   31.0   28.4   8.1   0.22   0.0   0.05   0.65   10.1   25.9   31.0   194.8
>= 5 cm   31.0   28.3   31.0   26.3   4.4   0.0   0.0   0.0   0.30   5.1   23.1   30.7   180.1
>= 10   31.0   28.3   30.8   24.8   3.2   0.0   0.0   0.0   0.04   3.1   20.1   29.8   171.1
>= 20   30.6   27.5   28.8   19.4   1.8   0.0   0.0   0.0   0.0   0.83   9.9   25.3   144.1

Wind:

Speed (km/h)   14.4   13.8   14.6   14.4   15.0   15.5   14.5   14.6   15.9   16.2   16.0   14.3   14.9
ost Frequent Direction  W  W  W  W  W  W  W  W  W  S  SW  S  W
Maximum Hourly Speed   57.0   56.0   72.0   63.0   56.0   59.0   65.0   65.0   65.0   93.0   74.0   67.0  
Date (yyyy/dd)  1978/10  2000/09  2002/11  1984/28  1987/13  1978/19+  1978/18  1978/12  1992/09  1984/28  1994/22  1982/04  
Maximum Gust Speed   83.0   78.0   89.0   85.0   81.0   82.0   104.0   102.0   93.0   122.0   89.0   85.0  
Date (yyyy/dd)  1990/28  1990/13  1986/23  1984/28  1987/13  1999/30  1984/23  1978/12  1989/29  1984/28  1982/21+  1982/04  
Direction of Maximum Gust  W  NW  SW  SE  SW  W  W  SW  W  W  SW  W  
Days with Winds >= 52 km/hr   0.35   0.09   0.42   0.22   0.25   0.43   0.25   0.33   0.77   0.57   0.43   0.29   4.4
Days with Winds >= 63 km/hr   0.0   0.04   0.13   0.04   0.08   0.09   0.17   0.10   0.14   0.13   0.09   0.0   1.0

Degree Days:

Above 24 °C   0.0   0.0   0.0   0.0   0.0   0.6   0.1   0.1   0.0   0.0   0.0   0.0   0.7
Above 18 °C   0.0   0.0   0.0   0.0   0.5   8.8   10.4   8.9   0.2   0.0   0.0   0.0   28.8
Above 15 °C   0.0   0.0   0.0   0.0   3.3   23.5   34.5   28.4   1.8   0.0   0.0   0.0   91.6
Above 10 °C   0.0   0.0   0.0   0.4   19.2   77.6   126.2   106.7   20.9   0.7   0.0   0.0   351.6
Above 5 °C   0.0   0.0   0.1   4.2   62.6   178.6   268.8   249.3   86.3   11.3   1.0   0.0   862.1
Above 0 °C   0.0   0.3   2.2   24.3   156.5   317.9   423.6   404.1   217.5   67.2   8.0   0.2   1621.8
Below 0 °C   713.8   617.3   453.2   169.6   22.2   0.4   0.0   0.0   0.6   29.2   200.0   527.9   2734.2
Below 5 °C   868.8   758.4   606.1   299.4   83.3   11.1   0.1   0.2   19.5   128.3   343.1   682.7   3800.8
Below 10 °C   1023.8   899.8   761.0   445.6   194.9   60.1   12.5   12.5   104.0   272.7   492.1   837.7   5116.7
Below 15 °C   1178.8   1041.2   916.0   595.2   334.0   156.0   75.9   89.3   235.0   427.0   642.1   992.7   6683.1
Below 18 °C   1271.8   1126.0   1009.0   685.2   424.2   231.3   144.8   162.8   323.4   520.0   732.1   1085.7   7716.2

 

 

 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year

Bright Sunshine:

Total Hours     111.7   164.7   201.3   224.1   249.0   245.1   193.2   106.5   66.1   36.5    
Days with measureable     22.0   25.4   24.9   26.2   27.3   28.4   27.0   23.9   19.5   13.8     
% of possible daylight hours     40.5   44.9   48.0   45.5   48.9   47.9   42.1   27.9   20.1   14.1     
Extreme Daily   8.4   10.0   12.1   14.3   16.0   17.2   16.3   14.8   12.5   9.8   8.7   6.9  
Date (yyyy/dd)  2000/28  1989/27+  1989/31  1977/27+  1977/27+  1996/19  1978/01+  1981/05  1983/02  1987/03  1985/02  1987/13+  

Humidex:

Extreme Humidex   0.1   4.8   11.1   21.8   33.9   37.5   35.0   35.5   31.5   28.3   11.7   7.6  
Date (yyyy/dd)  1992/04  2000/26  1979/21  1980/30  1998/16  1989/23  1990/28  1996/07  1996/02  1997/09  1977/03  1982/03  
Days with Humidex >= 30   0.0   0.0   0.0   0.0   0.0   1.2   1.5   1.3   0.1   0.0   0.0   0.0   4.1
Days with Humidex >= 35   0.0   0.0   0.0   0.0   0.0   0.3   0.0   0.1   0.0   0.0   0.0   0.0   0.4
Days with Humidex >= 40   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0

Wind Chill:

Extreme Wind Chill   -56.0   -56.9   -48.9   -40.1   -21.0   -12.5   -5.6   -6.5   -10.3   -18.2   -40.3   -52.9  
Date (yyyy/dd)  1977/10  1979/15  1984/12  1994/01  1983/16  1982/03  1983/05  1986/28  1980/28  1981/24  1976/30  1993/28  
Days with Wind Chill < -20   29.6   26.4   24.2   9.9   0.2   0.0   0.0   0.0   0.0   0.0   6.8   24.6   121.7
Days with Wind Chill < -30   25.4   22.2   14.7   1.7   0.0   0.0   0.0   0.0   0.0   0.0   1.3   15.0   80.1
Days with Wind Chill < -40   13.7   11.7   3.7   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   5.3   34.5

Humidity:

Average Vapour Pressure (kPa)   0.1   0.1   0.2   0.3   0.6   0.8   1.1   1.1   0.9   0.6   0.4   0.2   0.5
Average Relative Humidity - 0600LST (%)   71.9   72.1   74.7   78.3   78.6   78.6   84.2   88.0   90.3   89.2   87.5   79.2   81.1
Average Relative Humidity - 1500LST (%)   73.0   68.6   61.2   58.2   53.5   50.5   55.2   59.9   68.7   75.3   82.9   79.0   65.5

Pressure:

Average Station Pressure (kPa)   98.9   99.1   99.2   99.2   99.1   98.8   98.8   98.9   98.9   98.9   98.8   98.9   99.0
Average Sea Level Pressure (kPa)   101.4   101.7   101.7   101.7   101.5   101.2   101.1   101.3   101.3   101.3   101.2   101.4   101.4

Visibility (hours with):

< 1 km   8.1   6.0   6.9   12.6   19.0   13.0   26.9   24.0   16.5   24.2   23.7   11.4   192.2
1 to 9 km   154.2   118.9   112.8   79.4   63.7   58.4   69.4   75.9   96.9   145.8   188.6   182.4   1346.3
> 9 km   581.7   552.0   624.4   628.1   661.3   648.6   647.8   644.1   606.6   574.0   507.7   550.2   7226.4

Cloud Amount (hours with):

0 to 2 tenths   237.5   257.5   269.3   221.0   171.2   155.4   145.3   141.4   85.5   82.5   62.7   156.0   1985.2
3 to 7 tenths   148.5   139.9   140.4   126.7   143.6   178.5   191.1   169.1   125.5   98.6   86.1   117.9   1665.9
8 to 10 tenths   358.0   279.5   334.4   372.3   429.2   386.1   407.7   433.5   509.1   562.8   571.2   470.2   5113.7

 

 

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