Climate Insights for Flagstaff

The climate in Flagstaff is cool. The average annual temperature is 6°C and approximately 186mm of precipitation falls per year. May is the wettest month, receiving around 33mm of rainfall. Flagstaff 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: July, June, August. The coldest months are September, October, August, when temperatures can drop to -4°C. Snowfall occurs from February to December, with around 98cm accumulating over the season.

Temperatures in Flagstaff vary considerably across the year, with a 21°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 17°C with a mean of 9°C. The coldest month is September, when overnight lows fall to -4°C and the daily average is 7°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between January and February, with a 6°C shift in average temperatures.

Flagstaff is a quite dry location, receiving approximately 186mm of precipitation annually, which averages out to around 15mm per month. The wettest month is January, averaging 33mm of rainfall. February and March also tend to see above-average precipitation. The driest month is June, with just 0mm. That's 33mm less than January, 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 February to December, with around 98cm accumulating over the season. February typically sees the most snow at around 33cm.

Flagstaff 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 January, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, 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 7km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to pick up during the summer months. The seasonal averages are 2km/h in winter, 4km/h in spring, 6km/h in summer, 4km/h in autumn.

It is currently winter in Flagstaff, which began on June 21, 2026. Flagstaff 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 July at around 17°C, while the coldest stretch bottoms out in September near -4°C. Spring is next, beginning on September 23, 2026 (16 days from now).

The table below shows monthly climate averages for Flagstaff 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.