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Helena montana weather in december
Avg. 36°, 17°, 29, Hist. Avg. 36°, 16°, 1, . Avg. 36°, 16°, 30, Hist. Avg. 37°, 17°, 28, Hist. Helena, MT Monthly Weather | AccuWeather, December, , Daily, S, M, T, W, T, F, S, 27, Hist. Climate Averages ; High Temperature average high temperature in °F · 20° 40° 60° ; Very Hot Days # days where the high temperature rises above 90° F · 0 days 2 days. The . December Weather in Helena Montana, United States Daily high temperatures decrease by 6°F, from 36°F to 30°F, rarely falling below 12°F or exceeding 50°F. Get the monthly weather forecast for Helena, MT, including daily high/low, historical averages, to help you plan ahead. Get the monthly weather forecast for Helena, MT, including daily high/low, historical averages, to help you plan ahead. The weather is better from the previous month since in november it receives an average of . In december in Helena (Montana), the climate is relatively dry (with in of rainfall over 2 days). Interesting that the average daytime temperature is as +34°F while the average nightly. The average temperature in Helena in December year of is +30°F.