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St Louis weather is mostly influenced by cold air pushing south from Canada and warm, moist air pushing north from the Gulf of Mexico. This combination makes for mercurial weather conditions. When one air mass replaces another, particularly during winter and spring, the temperature may change by as much as 22°C (40°F) and 28°C (50°F) within a few hours.
Weather from the south tends to dominate during summer, pushing temperatures up across the June-September period. Winters, on the other hand, are affected by weather from the north, bringing weeks of cold and some days of snow (5-10 days per year). However, prolonged periods of extremely cold weather are rare.
Temperature (average ° C)
Humidity (average %)
Rainfall (average mm)
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