Climate Insights for Gridley

The climate in Gridley is warm and mild. The average annual temperature is 18°C and approximately 920mm of precipitation falls per year. January is the wettest month, receiving around 217mm of rainfall. Gridley 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 December, February, January, when temperatures can drop to 5°C. Light snow can occur between January and November.

Temperatures in Gridley vary considerably across the year, with a 33°C difference between the coldest and warmest months. July is the hottest month, with daytime highs reaching 38°C and an average of 29°C. December is the coolest month, with minimum temperatures around 5°C and an average of 9°C. On average, daily temperatures fluctuate by about 14°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Gridley is a moderately rainy area, receiving approximately 920mm of precipitation annually, which averages out to around 77mm per month. The wettest month is January, averaging 217mm of rainfall. March and February also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 217mm 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. Light snowfall can occur between January and November, totalling around 9cm annually. January is the snowiest month with approximately 3cm.

Gridley is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 3km/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 conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently spring in Gridley, which began on March 20, 2026. Gridley 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 38°C, while the coldest stretch bottoms out in December near 5°C. Summer is next, beginning on June 21, 2026 — 7 days from now.

The best time to visit Gridley is during April, May, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 42mm per month. By contrast, July can be uncomfortably hot with highs reaching 38°C, while December is the coldest period with lows dropping to 5°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Gridley 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.