Mountain Region Climate Graphs

Helena

In Helena, there was an increase in record highs and record lows during the entire 20th century.

Salt Lake City

Note difference in scale.  In Salt Lake City, there were no record lows or highs during the first 60 years of the 20th century.   There was a decrease in record lows and record highs occurred during the last 15 years of the 20th century.

 

Phoenix

In Phoenix, the number of record lows decreased substantially since the 1940s through the 1970s.  The number of record highs increased during the last 60 years of the 20th century.

Denver

As for Salt Lake City, Denver had no record lows or record highs during the first 60 years of the 20th century.  The number of record lows decreased during the last 15 years and the number of record highs stayed fairly constant.

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