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St. Charles

Missouri, United States

Climate metrics

Overall Comfort Mixed
Summer Feel Hot
Average Summer High Hot · 95°F
Days Above 90°F 29 days/year
Winter Feel Cool · 31°F
Average Winter Low 31°F / 0°C
Days Below Freezing 111 days/year
Humidity Humid · 76% average
Comfortable Months 9 months
Solar Exposure 1,510 peak-sun-hr/yr · Moderate
Air Quality Good
Current AQI AQI 43 · Good
Recent Fine-Particle Pollution Good · 7.2 µg/m³ multi-year average
Best Months MAY, JUN, SEP
Toughest Months DEC, JAN, FEB
Allergy Levels Poor
Heat Risk Moderate
Drought Risk High
Weather Volatility 3.3 / 5 · Moderate