Ziwang Deng, Xin Qiu, Xiaolan Zhou, Huaiping Zhu*

LAMPS,Department of Mathematics and Statistics,York University

*Project Leader: Professor Huaiping Zhu

2017-08-08

Inspired by a news article published on New York Times on July 28, 2017 [1] based on work carried out by Dr. James Hassen on global and hemispheric analyses[2], the York University LAMPS group did similar analyses for Ontario. The following animations clearly show that Ontario has been getting hotter – extreme hot events occurred more and more frequently in recent decades; and this is more apparent in the annual (Fig. 1) and winter (Fig.2) average temperature plots.

Plotted in the following animations are frequencies of occurrence (y-axis) of Ontario local seasonal and annual temperature anomalies (*dT*)
(at 608 CRU TS3.24.01[3] grid points within Ontario) divided by local standard deviation (*δ*, x-axis) obtained by binning all local results
and 11-year period into 0.05 frequency intervals. Area under each curve is unity. Standard deviations are for the 1951-1980 period[1][2].
The vertical dashed lines are used to separate the events classified as

*Extreme Cold:dT<-3δ**Cold:-3δ<=dT<-0.43δ*

*Normal:-0.43δ<=dT<0.43δ*

*Hot:0.43δ<=dT<3δ**Extreme Hot:dT>3δ*