British Columbia – Environment Canada – 5 year averages plotted using all monthly anomalies

British Columbia, Canada (BC)  is north of Washington/Idaho/Montana. Here is the same graph for BC as I did for Washington State in my previous post.

I downloaded monthly data from the Environment Canada (EC) websites. EC treats some stations as special and calculates anomalies against what they call Normals. As of today the Normals are calculated for 1971-2000 and I am using those special stations.

This data is in anomalies in Celsius, not Fahrenheit.

The last 5 years were exactly at the 1971-2000 average. Which puts the last 5 years colder than ~1925-1930, and colder than ~1940 and the same temperature as ~1945 and ~1960.

It is also .8C colder than the previous 5 years.

The thing that struck me about this graph is that previous 5 years were not hotter than many, many other periods. By not hotter I mean the positive anomalies were not larger. What made the previous 5 years “warmer” was the absence of really large negative anomalies. The recent 5 year period saw many anomalies around -2.5C .

And notice the y axis. There are only two positive anomalies greater than 5C in the whole record and they occurred in the 1800s. But up until 1985 there were many anomalies lower than -5C and even two greater than -10C.

I wonder if those large negative anomalies were the Little Ice Age holding onto the 20th century and the LIA finally let go … or may it is all those heated buildings clustered around weather stations making sure they don’t get too cold in the winter.



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