Climate Insights for Castleton

The climate in Castleton is cool. The average annual temperature is 8°C and approximately 1058mm of precipitation falls per year. Castleton receives a notable amount of rainfall throughout the year, including during its driest month. Castleton is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Luglio, Agosto, Giugno. The coldest months are Gennaio, Febbraio, Dicembre, when temperatures can drop to -9°C. Snowfall occurs from January to December, with around 145cm accumulating over the season.

Castleton has a wide annual temperature range, spanning 36°C from the coldest to warmest months. The warmest month is Luglio, when average highs reach 27°C and the mean temperature sits around 22°C. The coldest month is Gennaio, when overnight lows fall to -9°C and the daily average is -5°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 7°C shift in average temperatures.

Castleton is a moderately rainy area, receiving approximately 1058mm of precipitation annually, which averages out to around 88mm per month. The wettest month is October, averaging 109mm of rainfall. June and April also tend to see above-average precipitation. The driest month is May, with just 70mm. That's 39mm less than October, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 145cm accumulating over the season. January typically sees the most snow at around 33cm.

Castleton is mildly breezy, with an average annual wind speed of 14km/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 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h 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 15km/h in winter, 15km/h in spring, 13km/h in summer, 14km/h in autumn.

It is currently spring in Castleton, which began on March 20, 2026. Castleton 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 27°C, while the coldest stretch bottoms out in Gennaio near -9°C. Summer is next, beginning on June 21, 2026 — 92 days from now.

The best time to visit Castleton is during Agosto and Settembre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 80mm per month. By contrast, Luglio can be uncomfortably hot with highs reaching 27°C, while Gennaio is the coldest period with lows dropping to -9°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 Castleton 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.