Climate Insights for Cromwell

The climate in Cromwell is cool. The average annual temperature is 7°C and approximately 992mm of precipitation falls per year. Cromwell receives a notable amount of rainfall throughout the year, including during its driest month. Cromwell 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 July, June, August, when temperatures can drop to -3°C. Snowfall occurs from April to November, with around 95cm accumulating over the season.

Temperatures in Cromwell vary considerably across the year, with a 22°C difference between the coldest and warmest months. January is the warmest month, though highs remain moderate at 19°C with a mean of 14°C. The coldest month is July, when overnight lows fall to -3°C and the daily average is 0°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between March and April, with a 4°C shift in average temperatures.

Cromwell is a moderately rainy area, receiving approximately 992mm of precipitation annually, which averages out to around 83mm per month. The wettest month is October, averaging 102mm of rainfall. September and November also tend to see above-average precipitation. The driest month is August, with just 60mm. That's 41mm 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 April to November, with around 95cm accumulating over the season. July typically sees the most snow at around 20cm.

Cromwell is relatively calm, with an average annual wind speed of 11km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 7km/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 pick up during the summer months. The seasonal averages are 7km/h in winter, 12km/h in spring, 13km/h in summer, 10km/h in autumn.

It is currently autumn in Cromwell, which began on March 20, 2026. Cromwell 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 19°C, while the coldest stretch bottoms out in July near -3°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The table below shows monthly climate averages for Cromwell 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.