The National Climatic Data Center (NCDC) data shows the mean temperature from 1971-2000 for Montana was 5.97°C (42.74°F) and Wyoming's was 5.54°C (41.98°F).
Montana is at a higher latitude, so this is surprising.
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asked May 11, 2014 at 20:18
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11$\begingroup$ Wyoming's mean elevations (2040 m) is higher than Montana's mean elevations (1040 m). $\endgroup$– blundersCommented May 11, 2014 at 21:58
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$\begingroup$ The difference between them isn't very significant... $\endgroup$– PaulCommented May 12, 2014 at 21:45
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1$\begingroup$ @Paul How large a temperature difference would be significant? $\endgroup$– gerrit ♦Commented May 13, 2014 at 16:21
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1 Answer
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As mentioned in the comments, the 1km difference in average elevation of Wyoming in comparison to Montana plays a major role, as from the website Wyoming State Climate Office,
Because of its elevation, Wyoming has a relatively cool climate.
However, there is a bit more to it than that, the presence of numerous valleys
provide ideal pockets for the collection of cold air drainage at night. Protecting mountain ranges prevent the wind from stirring the air, and the colder heavier air settles into the valleys often sending readings well below zero.