Climate Insights for Affton

The climate in Affton is temperate. The average annual temperature is 14°C and approximately 1154mm of precipitation falls per year. Affton receives a notable amount of rainfall throughout the year, including during its driest month. Affton 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 January, February, December, when temperatures can drop to -3°C. Light snow can occur between January and December.

Temperatures in Affton vary considerably across the year, with a 35°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 32°C and the mean temperature sits around 27°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is 0°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Affton is a moderately rainy area, receiving approximately 1154mm of precipitation annually, which averages out to around 96mm per month. The wettest month is April, averaging 136mm of rainfall. May and March also tend to see above-average precipitation. The driest month is December, with just 65mm. That's 71mm less than April, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Light snowfall can occur between January and December, totalling around 41cm annually. January is the snowiest month with approximately 16cm.

Affton is relatively calm, with an average annual wind speed of 11km/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 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/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 13km/h in winter, 13km/h in spring, 9km/h in summer, 11km/h in autumn.

It is currently summer in Affton, which began on June 21, 2026. Affton 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 32°C, while the coldest stretch bottoms out in January near -3°C. Autumn is next, beginning on September 23, 2026 (8 days from now).

The best time to visit Affton is during September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 83mm per month. By contrast, July can be uncomfortably hot with highs reaching 32°C, while January is the coldest period with lows dropping to -3°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Affton 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.