sunshine hours

January 23, 2013

Extreme Weather In Canada – 1936 is tops using +10C or -10C

Filed under: Canada,Environment Canada Data — sunshinehours1 @ 4:40 AM
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As a follow up to yesterdays post about monthly anomalies in Canada of +15C  or higher and -15C and colder, I thought I would take a look what happens if I set the bar at +10C  or -10C.

I am using Environment Canada Normals from their monthly summaries. The values are the anomaly from the 1971-2000 average (the Normals).

In 1936, 3.6% of the monthly anomalies were -10C or colder than normal. 

A -10C or lower deviation from normal for a whole month is definitely extreme! 

And notice 1982 is the most recent year to make the top 25.

Top 25 Cold Anomaly Months in a Year (by %)

Year Anomaly_Count Cold_Anomalies Hot_Anomalies Pct_Cold_Anomalies Pct_Hot_Anomalies
1936 2281 82 0 3.595 0
1907 555 17 0 3.063 0
1899 433 13 0 3.002 0
1950 3868 116 0 2.999 0
1896 374 11 0 2.941 0
1916 1332 36 0 2.703 0
1890 277 7 0 2.527 0
1904 525 10 0 1.905 0
1937 2361 40 0 1.694 0
1969 9771 159 5 1.627 0.051
1917 1349 21 1 1.557 0.074
1893 327 5 0 1.529 0
1979 13984 196 4 1.402 0.029
1891 272 3 0 1.103 0
1897 373 4 0 1.072 0
1982 14928 154 0 1.032 0
1933 2172 20 0 0.921 0
1939 2658 20 1 0.752 0.038
1922 1557 11 0 0.706 0
1966 8479 58 0 0.684 0
1911 674 4 1 0.593 0.148
1951 4120 24 0 0.583 0
1955 4756 27 0 0.568 0
1954 4592 26 1 0.566 0.022
1930 2025 11 2 0.543 0.099

Hot Anomalies are much rarer.

Only .688% of the anomalies were 10C or higher in 2006. Thats less than 1/5th of the largest percentage of cold anomalies. It was also 6 years ago.

Top 25 Hot Anomaly Months in a Year (by %)

Year Anomaly_Count Cold_Anomalies Hot_Anomalies Pct_Cold_Anomalies Pct_Hot_Anomalies
2006 6979 12 48 0.172 0.688
1931 2054 0 12 0 0.584
2001 9869 1 37 0.01 0.375
2010 5367 0 18 0 0.335
1981 14717 0 46 0 0.313
1926 1832 0 4 0 0.218
1947 3376 0 7 0 0.207
1977 13502 8 27 0.059 0.2
1943 3175 1 5 0.031 0.157
1911 674 4 1 0.593 0.148
1919 1403 2 2 0.143 0.143
1998 10503 0 15 0 0.143
1942 2977 1 4 0.034 0.134
1985 15582 84 20 0.539 0.128
2004 8159 0 9 0 0.11
2002 9206 42 10 0.456 0.109
1930 2025 11 2 0.543 0.099
1944 3280 1 3 0.03 0.091
1960 5870 0 5 0 0.085
2012 3750 2 3 0.053 0.08
2005 7581 0 6 0 0.079
1917 1349 21 1 1.557 0.074
1958 5466 0 4 0 0.073
1997 10891 2 8 0.018 0.073
1949 3693 11 2 0.298 0.054
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1 Comment »

  1. That’s interesting stuff. When I say that 1968/69 was the coldest cold snap on record, I’m referring to BC, which is only once portion of the entire coutnry. If you take into account the three winter months (Dec, Jan, Feb), then the winter of 1968/1969 was by far the most below normal in British Columbia history.

    I’m surprised not to see 1936 in the “hot” category since that was apparently the worst heat wave to hit Canada. Temperature reaching 44.4 degrees (112 F) in Manitoba. St Albans, Manitoba was over 40 degrees 9 days that summer. I believe this is a Canadian record for the most days reaching 40 or more degrees in a year.

    Comment by Glacier — January 23, 2013 @ 9:22 AM | Reply


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