sunshine hours

February 16, 2014

Canada is Cooling at -0.13C Per Decade Since 1998

Filed under: Canada,Environment Canada Data — sunshinehours1 @ 9:07 AM
Tags: ,

Environment Canada publishes monthly summaries here. The data included Tmax, Tmean, Tmin and Normals (the D column). The Normals column is “Mean Temperature difference from Normal (1971-2000) (°C)”. These are supposedly the higher quality stations. Only some of the stations get a Normals value.

I could just look at the stations with Normals and summarize the data. But some of the stations are close together. So I thought why not summarize the data by 1×1 grid square and then summarize the grid squares. The green line is the count of grid squares with data in them. That is dropping like a stone. (I will discuss this in another post).

And why not see what happens from 1998. We know 1998 is a pivot point in climate.

The trend for the whole country from 1998 is cooling at -0.13C/decade. The big surprise is Ontario. The last time I did this it was warming. Here are the trends for each province.

All  -0.13
BC   -0.20 
ALTA -0.35 
SASK -0.53 
MAN  -0.56 
ONT  -0.13
QUE   0.25 
NS    0.12 
NB    0.23 
NFLD  0.35 
PEI   0.26 
NWT  -0.22 
YT   -0.22 
NU    0.54

And here are the graphs for each province and then one more for the whole country. Click For bigger.

Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - All Provinces

Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - BC
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - ALTA
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - SASK
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - MAN
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - ONT
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - QUE

Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - NS
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - PEI
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - NFLD
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - NB
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - NU
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - YT
Canada Monthly Summary Analysis - 1998 to 2014 - 'Normals' Anomaly - 1x1 Grid - NWT

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4 Comments »

  1. Interesting that Atlantic Canada and some areas up north are warming….AMO I wonder? Pacific is in a negative phase, while the AMO is positive right now…

    Comment by Lance — February 16, 2014 @ 3:34 PM | Reply

    • West coast peaked around 2005 or so and then PDO turned negative. I suspect the AMO was keeping Atlantic Canada warmer.

      Comment by sunshinehours1 — February 16, 2014 @ 3:49 PM | Reply

  2. Nice data presentation. I notice a big difference occurs over 2010-2011 with warm spike out east that fades as you move northeast to southwest. I’m also noticing thicker ice in Canadian waters this winter which will be an influence on spring temps across the north.

    Comment by Dave in Canmore — February 17, 2014 @ 9:26 AM | Reply


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