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Yellowstone — weather by month

The air temperature by month
The average maximum daily temperature — 21.5°C in July. Average maximum night temperature — 8.7°C in August. The average minimum daily temperature — -7.2°C December. The average minimum night temperature — -13.3°C in January.
Precipitation, mm
Maximum precipitation — 90.5 mm It was recorded in May. Minimum precipitation — 35 mm It was recorded in July.
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