Climate Overview
The climate in Castle Rock is temperate. The average annual temperature is 10°C and approximately 1728mm of precipitation falls per year. Dicembre is the wettest month, receiving around 260mm of rainfall. Castle Rock is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Agosto, Luglio, Giugno. The coldest months are Febbraio, Dicembre, Gennaio, when temperatures can drop to 2°C. Snowfall occurs from January to December, with around 80cm accumulating over the season.
Temperature
Temperatures in Castle Rock vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is Agosto, when average highs reach 27°C and the mean temperature sits around 18°C. Febbraio is the coolest month, with minimum temperatures around 2°C and an average of 4°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.
Precipitation
Castle Rock is a fairly wet location, receiving approximately 1728mm of precipitation annually, which averages out to around 144mm per month. The wettest month is December, averaging 260mm of rainfall. November and January also tend to see above-average precipitation. The driest month is July, with just 12mm. That's 249mm less than December, 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. Snowfall is a regular feature from January to December, with around 80cm accumulating over the season. February typically sees the most snow at around 27cm.
Wind
Castle Rock is mildly breezy, with an average annual wind speed of 13km/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 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/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 14km/h in winter, 13km/h in spring, 12km/h in summer, 12km/h in autumn.
Seasons
92 days until Summer
It is currently spring in Castle Rock, which began on March 20, 2026. Castle Rock 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 Agosto at around 27°C, while the coldest stretch bottoms out in Febbraio near 2°C. Summer is next, beginning on June 21, 2026 — 92 days from now.
Spring
Temperatures range from 3 to 19°C. Rainfall is heavy, totalling around 424mm across the season with a monthly average of 141mm. Winds are generally light, averaging 13km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 10 to 27°C. Rainfall is relatively light, with around 100mm over the season and a monthly average of 33mm. Winds are generally light, averaging 12km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 4 to 22°C. Rainfall is heavy, totalling around 500mm across the season with a monthly average of 167mm. Winds are generally light, averaging 12km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 2 to 8°C. Rainfall is heavy, totalling around 704mm across the season with a monthly average of 235mm. Expect around 59cm of snow accumulation during this period. Winds are generally light, averaging 14km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Best Time to Visit
The best time to visit Castle Rock is during Giugno, Luglio, Agosto and Settembre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 44mm per month. By contrast, Febbraio can be quite cold with temperatures dropping to 2°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for Castle Rock 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.