Climate Insights for Bethalto

The climate in Bethalto is temperate. The average annual temperature is 14°C and approximately 1112mm of precipitation falls per year. Bethalto receives a notable amount of rainfall throughout the year, including during its driest month. Bethalto is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Luglio, Giugno, Agosto. The coldest months are Gennaio, Febbraio, Dicembre, when temperatures can drop to -3°C. Light snow can occur between January and December.

Temperatures in Bethalto vary considerably across the year, with a 34°C difference between the coldest and warmest months. The warmest month is Luglio, when average highs reach 31°C and the mean temperature sits around 26°C. The coldest month is Gennaio, 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.

Bethalto is a moderately rainy area, receiving approximately 1112mm of precipitation annually, which averages out to around 93mm per month. The wettest month is May, averaging 127mm of rainfall. April and July also tend to see above-average precipitation. The driest month is February, with just 66mm. That's 62mm less than May, 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 31cm annually. February is the snowiest month with approximately 12cm.

Bethalto is mildly breezy, with an average annual wind speed of 17km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 13km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/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 18km/h in winter, 19km/h in spring, 14km/h in summer, 16km/h in autumn.

It is currently winter in Bethalto, which began on December 21, 2026. Bethalto 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 Luglio at around 31°C, while the coldest stretch bottoms out in Gennaio near -3°C. Spring is next, beginning on March 20, 2026 — 1 days from now.

The best time to visit Bethalto is during Giugno and Settembre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 85mm per month. By contrast, Luglio can be uncomfortably hot with highs reaching 31°C, while Gennaio 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 Bethalto 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.