Kansas City, Missouri weather in December

Averages from 2021–2025 (155 days of record).

Average high: 46°F
Average low: 30°F
Rainy days: ~5 per month
Total precipitation: 1.7 in
Warmest recorded: 73°F
Coldest recorded: -5°F

Expect December days in Kansas City, Missouri to top out around 46°F and cool to about 30°F overnight, with roughly 5 days of measurable rain across the month. In recent years December has ranged from -5°F to 73°F.

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Current Kansas City, Missouri forecast → · Historical data by Open-Meteo (ERA5).