Climate Insights for Guymon

The climate in Guymon is temperate. The average annual temperature is 15°C and approximately 349mm of precipitation falls per year. April is the wettest month, receiving around 97mm of rainfall. Guymon is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are December, January, February, when temperatures can drop to -4°C. Light snow can occur between January and December.

Guymon has a wide annual temperature range, spanning 40°C from the coldest to warmest months. July is the hottest month, with daytime highs reaching 36°C and an average of 28°C. The coldest month is December, when overnight lows fall to -4°C and the daily average is 1°C. On average, daily temperatures fluctuate by about 15°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 9°C shift in average temperatures.

Guymon is a quite dry location, receiving approximately 349mm of precipitation annually, which averages out to around 29mm per month. The wettest month is April, averaging 97mm of rainfall. August and May also tend to see above-average precipitation. The driest month is March, with just 7mm. That's 89mm less than April, 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 18cm annually. December is the snowiest month with approximately 9cm.

Guymon is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently summer in Guymon, which began on June 21, 2026. Guymon 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 July at around 36°C, while the coldest stretch bottoms out in December near -4°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Guymon is during May, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 34mm per month. By contrast, July can be uncomfortably hot with highs reaching 36°C, while December is the coldest period with lows dropping to -4°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Guymon 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.