Climate Insights for Diamond Bar Jones Airport

The climate in Diamond Bar Jones Airport is cool. The average annual temperature is 10°C and approximately 646mm of precipitation falls per year. May is the wettest month, receiving around 125mm of rainfall. Diamond Bar Jones Airport 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 February, January, December, when temperatures can drop to -8°C. Snowfall occurs from January to December, with around 76cm accumulating over the season.

Diamond Bar Jones Airport has a wide annual temperature range, spanning 38°C from the coldest to warmest months. The warmest month is July, when average highs reach 30°C and the mean temperature sits around 24°C. The coldest month is February, when overnight lows fall to -8°C and the daily average is -3°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 9°C shift in average temperatures.

Diamond Bar Jones Airport is a relatively dry area, receiving approximately 646mm of precipitation annually, which averages out to around 54mm per month. The wettest month is May, averaging 125mm of rainfall. July and June also tend to see above-average precipitation. The driest month is February, with just 18mm. That's 107mm less than May, 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 January to December, with around 76cm accumulating over the season. December typically sees the most snow at around 16cm.

Diamond Bar Jones Airport is moderately windy, with an average annual wind speed of 25km/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 30km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 22km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 8km/h between the calmest and windiest months.

It is currently spring in Diamond Bar Jones Airport, which began on March 20, 2026. Diamond Bar Jones Airport 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 30°C, while the coldest stretch bottoms out in February near -8°C. Summer is next, beginning on June 21, 2026 — 87 days from now.

The best time to visit Diamond Bar Jones Airport is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 67mm per month. By contrast, February can be quite cold with temperatures dropping to -8°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 Diamond Bar Jones Airport 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.