Climate Overview
The climate in Castle Rock is cool. The average annual temperature is 6°C and approximately 582mm of precipitation falls per year. Maggio is the wettest month, receiving around 109mm of rainfall. Castle Rock 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 -12°C. Snowfall occurs from January to December, with around 162cm accumulating over the season.
Temperature
Castle Rock has a wide annual temperature range, spanning 39°C from the coldest to warmest months. The warmest month is Luglio, when average highs reach 27°C and the mean temperature sits around 19°C. The coldest month is Gennaio, when overnight lows fall to -12°C and the daily average is -6°C. On average, daily temperatures fluctuate by about 15°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 8°C shift in average temperatures.
Precipitation
Castle Rock is a relatively dry area, receiving approximately 582mm of precipitation annually, which averages out to around 49mm per month. The wettest month is May, averaging 109mm of rainfall. July and June also tend to see above-average precipitation. The driest month is December, with just 17mm. That's 92mm less than May, 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 162cm accumulating over the season. March typically sees the most snow at around 35cm.
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 April, averaging 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, 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 3km/h between the calmest and windiest months.
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 Luglio at around 27°C, while the coldest stretch bottoms out in Gennaio near -12°C. Summer is next, beginning on June 21, 2026 — 92 days from now.
Spring
Temperatures range from -7 to 17°C. Precipitation is moderate at around 222mm for the season, averaging 74mm per month. Winds are generally light, averaging 14km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 9 to 27°C. Precipitation is moderate at around 200mm for the season, averaging 67mm per month. Winds are generally light, averaging 13km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from -6 to 24°C. Rainfall is relatively light, with around 91mm over the season and a monthly average of 30mm. Expect around 31cm of snow accumulation during this period. Winds are generally light, averaging 13km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from -12 to 4°C. Rainfall is relatively light, with around 69mm over the season and a monthly average of 23mm. Expect around 50cm of snow accumulation during this period. Winds are generally light, averaging 13km/h. Heavy layering and insulated outerwear are essential — exposed skin should be minimised outdoors.
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 58mm per month. By contrast, Gennaio can be quite cold with temperatures dropping to -12°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.