Climate Insights for Duncan

The climate in Duncan is temperate. The average annual temperature is 18°C and approximately 817mm of precipitation falls per year. Duncan receives a notable amount of rainfall throughout the year, including during its driest month. Duncan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to 0°C. Light snow can occur between January and December.

Duncan has a wide annual temperature range, spanning 36°C from the coldest to warmest months. July is the hottest month, with daytime highs reaching 36°C and an average of 30°C. January is the coolest month, with minimum temperatures around 0°C and an average of 5°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Duncan is a moderately rainy area, receiving approximately 817mm of precipitation annually, which averages out to around 68mm per month. The wettest month is April, averaging 133mm of rainfall. May and October also tend to see above-average precipitation. The driest month is December, with just 36mm. That's 96mm less than April, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Light snowfall can occur between January and December, totalling around 13cm annually. February is the snowiest month with approximately 6cm.

Duncan 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 April, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, 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.

It is currently summer in Duncan, which began on June 21, 2026. Duncan 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 July at around 36°C, while the coldest stretch bottoms out in January near 0°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Duncan is during October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 88mm per month. By contrast, July can be uncomfortably hot with highs reaching 36°C, while January is the coldest period with lows dropping to 0°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 Duncan 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.