Climate Insights for Copalis State Airport

The climate in Copalis State Airport is temperate. The average annual temperature is 11°C and approximately 2175mm of precipitation falls per year. November is the wettest month, receiving around 366mm of rainfall. Copalis State Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, December, March, when temperatures can drop to 6°C. Light snow can occur between January and December.

Copalis State Airport sees moderate temperature variation throughout the year, ranging from 6°C to 18°C. August is the warmest month, though highs remain moderate at 18°C with a mean of 15°C. February is the coolest month, with minimum temperatures around 6°C and an average of 7°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between October and November, with a 3°C shift in average temperatures.

Copalis State Airport is a very wet location, receiving approximately 2175mm of precipitation annually, which averages out to around 181mm per month. The wettest month is November, averaging 366mm of rainfall. January and December also tend to see above-average precipitation. The driest month is July, with just 17mm. That's 349mm less than November, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Light snowfall can occur between January and December, totalling around 14cm annually. February is the snowiest month with approximately 5cm.

Copalis State Airport is moderately windy, with an average annual wind speed of 24km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 28km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in September, with average winds dropping to 20km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 8km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 27km/h in winter, 24km/h in spring, 21km/h in summer, 24km/h in autumn.

It is currently spring in Copalis State Airport, which began on March 20, 2026. Copalis State Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 18°C, while the coldest stretch bottoms out in February near 6°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Copalis State Airport is during August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 15°C with modest rainfall averaging 27mm per month. By contrast, February can be quite cold with temperatures dropping to 6°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Copalis State Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.