Monthly weather forecast and Climate
North Cascades National Park, WA US

Warmest months (with highest average high temperature) are July and August (70°F).
Months with lowest average high temperature are January and December (30°F).

Months with highest average low temperature are July and August (45°F).
Coldest months (with lowest average low temperature) are January and December (18°F).

Wettest month (with highest rainfall) is December (7.8").
Driest months (with lowest rainfall) are July and August (1.7").

Month with highest number of rainy days is December (18 days).
Month with lowest number of rainy days is July (8 days).

Months with longest days are June and July (Average daylight: 16h).
Month with shortest days is December (Average daylight: 8h).

Month with most sunshine is July (Average sunshine: 9h).
Months with least sunshine are January, November and December (Average sunshine: 2).

Months with highest UV index are June, July and August (UV index 7).
Months with lowest UV index are January, November and December (UV index 1).