May weather forecast and climate
Boulder, MT US

• Average high temperature in May: 64°F

Warmest months (with the highest average high temperature) are July and August (82°F).
The month with the lowest average high temperature is January (33°F).

• Average low temperature in May: 35°F

The month with the highest average low temperature is July (48°F).
The coldest month (with the lowest average low temperature) is January (9°F).

• Average rainfall in May: 1.8"

The wettest month (with the highest rainfall) is June (2.1").
The driest month (with the lowest rainfall) is February (0.3").

• Average daylight in May: 15h

The month with the longest days is June (Average daylight: 15.7h).
The month with shortest days is December (Average daylight: 8.7h).