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

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

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

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

The month with the highest number of rainy days is December (18 days).
The month with the lowest number of rainy days is July (8 days).

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

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

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