Climate Insights for Castro

The climate in Castro is cold. The average annual temperature is -8°C and approximately 209mm of precipitation falls per year. December is the wettest month, receiving around 33mm of rainfall. Castro is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: January, February, December. The coldest months are June, July, May, when temperatures can drop to -11°C. Castro experiences heavy snowfall, typically from January through December.

Castro has relatively stable temperatures year-round, staying within a 9°C range. January is the warmest month, though highs remain moderate at -2°C with a mean of -2°C. The coldest month is June, when overnight lows fall to -11°C and the daily average is -10°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between February and March, with a 3°C shift in average temperatures.

Castro is a quite dry location, receiving approximately 209mm of precipitation annually, which averages out to around 17mm per month. The wettest month is September, averaging 33mm of rainfall. October and November also tend to see above-average precipitation. The driest month is April, with just 0mm. That's 33mm less than September, 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. Castro receives heavy snowfall, accumulating around 209cm annually from January through December. The snowiest month is September, with approximately 33cm. Winter travel should account for significant snow cover.

Castro is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 4km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 5km/h in winter, 5km/h in spring, 3km/h in summer, 4km/h in autumn.

It is currently winter in Castro, which began on June 21, 2026. Castro is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in January at around -2°C, while the coldest stretch bottoms out in June near -11°C. Spring is next, beginning on September 23, 2026 — 16 days from now.

The table below shows monthly climate averages for Castro 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.