Zip 91739 (Rancho Cucamonga, CA) Climate

Rancho Cucamonga, CA is situated in the foothills of the San Gabriel Mountains with an average temperature of 64°F (18°C). The summers are warm and dry with temperatures reaching into the mid 80s (30°C), while winter temperatures can drop to the low 40s (5°C). The climate typically follows a Mediterranean pattern, with hot, dry summers and mild winters. In addition, Rancho Cucamonga experiences very little precipitation throughout the year, averaging only 12-14 inches annually.

Rancho Cucamonga (zip 91739), California gets 20 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Rancho Cucamonga (zip 91739) averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 282 sunny days per year in Rancho Cucamonga (zip 91739). The US average is 205 sunny days.

Rancho Cucamonga (zip 91739) gets some kind of precipitation, on average, 42 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 94 degrees
Winter Low: the January low is 42
Rain: averages 20 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for the 91739 zip code is 8.6 (10=best), which means it is more comfortable than most places in California.

8 Summer - 8.5 Winter

May, October and April are the most pleasant months in the 91739 zip code, while August and July are the least comfortable months.

Climate	Rancho Cucamonga, California	United States
	19.5 in.	38.1 in.
	0.0 in.	27.8 in.
	42.0 days	106.2 days
	282 days	205 days
	94.4°	85.8°
	42.1°	21.7°
	8.6	7
	5.7	4.3
	1402 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for the 91739 zip code with an average high temperature of 95.6°, which ranks it as warmer than most places in California. In the 91739 zip code, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for the 91739 zip code are April, May and October.

In the 91739 zip code, there are 97.2 days annually when the high temperature is over 90°, which is hotter than most places in California.

December has the coldest nighttime temperatures for the 91739 zip code with an average of 41.2°. This is warmer than most places in California.

In the 91739 zip code, there are 3.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In the 91739 zip code, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

Humidity in the 91739 zip code is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.

February is the wettest month in the 91739 zip code with 4.5 inches of rain, and the driest month is July with 0.1 inches. The wettest season is Spring with 59% of yearly precipitation and 3% occurs in Autumn, which is the driest season. The annual rainfall of 19.5 inches in the 91739 zip code means that it is about average compared to other places in California.

February is the rainiest month in the 91739 zip code with 7.2 days of rain, and July is the driest month with only 0.6 rainy days. There are 42.0 rainy days annually in the 91739 zip code, which is less rainy than most places in California. The rainiest season is Spring when it rains 45% of the time and the driest is Autumn with only a 5% chance of a rainy day.

There is rarely any recorded snowfall in the 91739 zip code, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in the 91739 zip code.

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