Alum Rock, CA Climate


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United States / California / San Jose-Sunnyvale-Santa Clara Metro Area / Santa Clara County / Alum Rock / Zip Codes
Alum Rock, CA is known for its mild Mediterranean climate. Temperatures here range from the mid-50s in the winter to the mid-80s in the summer. In addition, rainfall is fairly moderate throughout the year with snow being rare and usually confined to higher elevations. Because of this favorable climate, Alum Rock's residents enjoy plenty of sunshine and warm weather throughout most of the year, making it an ideal spot for outdoor activities such as hiking, biking, and camping.

Alum Rock, California gets 16 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Alum Rock averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 260 sunny days per year in Alum Rock. The US average is 205 sunny days.

Alum Rock gets some kind of precipitation, on average, 63 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 80 degrees
Winter Low: the January low is 42
Rain: averages 16 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Alum Rock is 8.8 (10=best), which means it is more comfortable than most places in California.

9.9 Summer - 7.6 Winter
August, July and September are the most pleasant months in Alum Rock, while December and January are the least comfortable months.

  ClimateAlum Rock, CaliforniaUnited States
  15.5 in.38.1 in.
  0.0 in.27.8 in.
  62.5 days106.2 days
  260 days205 days
  80.4°85.8°
  42.3°21.7°
  8.87
  5.14.3
  151 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 Alum Rock with an average high temperature of 80.5°, which ranks it as cooler than most places in California. In Alum Rock, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Alum Rock are June, September and July.
In Alum Rock, there are 13.6 days annually when the high temperature is over 90°, which is cooler than most places in California.
December has the coldest nighttime temperatures for Alum Rock with an average of 42.2°. This is warmer than most places in California.
In Alum Rock, there are 2.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.
In Alum Rock, 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 is low in Alum Rock, and some people might find the dryness to be uncomfortable. Days with noticeable humidity are rare throughout the year. A very dry climate can lead to cracked, itchy skin and dry eyes.
February is the wettest month in Alum Rock with 3.1 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 56% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 15.5 inches in Alum Rock means that it is drier than most places in California.
December is the rainiest month in Alum Rock with 10.4 days of rain, and July is the driest month with only 0.2 rainy days. There are 62.5 rainy days annually in Alum Rock, which is rainier 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 2% chance of a rainy day.
There is rarely any recorded snowfall in Alum Rock, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Alum Rock.
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