North Cascades National Park (WA) Temperature by Month
The average annual maximum temperature in North Cascades National Park, Washington State, United States of America is 10°C (50°F), with daytime highs ranging from 1°C (34°F) in December to 21°C (70°F) in August. This page covers monthly averages, day-night differences, and how North Cascades National Park compares to cities worldwide.
North Cascades National Park Monthly Temperatures
In North Cascades National Park, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 10°C (50°F) in August to -4°C (25°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in North Cascades National Park by month:
Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: North Cascades National Park vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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North Cascades National Park vs World: Temperature Compared
North Cascades National Park's average annual maximum temperature is 10°C (50°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in North Cascades National Park this rarely lasts long on the ground.
For more on North Cascades National Park's weather — including monthly rainfall, sunshine hours, and humidity — visit our North Cascades National Park climate page.
