August is the hottest month for Upland with an average high temperature of 93.5°, which ranks it as warmer than most places in California. In Upland, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Upland are May, April and October.

July is the hottest month for Walnut Creek with an average high temperature of 85.8°, which ranks it as cooler than most places in California. In Walnut Creek, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Walnut Creek are May, October and June.

December has the coldest nighttime temperatures for Upland with an average of 41.8°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Walnut Creek with an average of 39.5°. This is warmer than most places in California.

In Upland, there are 81.0 days annually when the high temperature is over 90°, which is hotter than most places in California.

In Walnut Creek, there are 36.5 days annually when the high temperature is over 90°, which is about average compared to other places in California.

In Upland, there are 2.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Walnut Creek, there are 9.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Upland, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In Walnut Creek, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

February is the wettest month in Upland with 5.1 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 60% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 21.0 inches in Upland means that it is about average compared to other places in California.


February is the wettest month in Walnut Creek with 3.9 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 19.6 inches in Walnut Creek means that it is about average compared to other places in California.

February is the rainiest month in Upland with 5.9 days of rain, and July is the driest month with only 0.1 rainy days. There are 32.5 rainy days annually in Upland, which is less rainy than most places in California. The rainiest season is Spring when it rains 49% of the time and the driest is Autumn with only a 3% chance of a rainy day.

December is the rainiest month in Walnut Creek with 11.1 days of rain, and July is the driest month with only 0.1 rainy days. There are 62.2 rainy days annually in Walnut Creek, which is rainier than most places in California. The rainiest season is Spring when it rains 52% of the time and the driest is Autumn with only a 2% chance of a rainy day.

There is rarely any recorded snowfall in Upland, ranking it as one of the least snowy places in California.

There is rarely any recorded snowfall in Walnut Creek, ranking it as one of the least snowy places in California.

Any measurable snowfall is a rare occurance in Upland.

Any measurable snowfall is a rare occurance in Walnut Creek.

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