Hillsborough, CA Climate


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United States / California / San Francisco-Oakland-Berkeley Metro Area / San Mateo County / Hillsborough / Zip Codes
Hillsborough, CA typically has a mild climate all year round. During the summer months, temperatures range from the high-60s to mid-70s Fahrenheit, making it an ideal place for outdoor activities like hiking and swimming. Winters are usually cool with little to no snowfall. The average annual rainfall is 17 inches, making it a great place for light gardening or relaxing in the sunshine. Overall, Hillsborough has a pleasant climate that makes it inviting all year long.

Hillsborough, California gets 23 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Hillsborough 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 Hillsborough. The US average is 205 sunny days.

Hillsborough gets some kind of precipitation, on average, 81 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 73 degrees
Winter Low: the January low is 42
Rain: averages 23 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Hillsborough is 8.4 (10=best), which means it is more comfortable than most places in California.

9.5 Summer - 7.4 Winter
August, July and September are the most pleasant months in Hillsborough, while January and December are the least comfortable months.

  ClimateHillsborough, CaliforniaUnited States
  23.3 in.38.1 in.
  0.0 in.27.8 in.
  81.0 days106.2 days
  260 days205 days
  72.9°85.8°
  42.1°21.7°
  8.47
  4.94.3
  322 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 Hillsborough with an average high temperature of 73.3°, which ranks it as one of the coolest places in California. In Hillsborough, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Hillsborough are August, September and July.
In Hillsborough, there are 6.7 days annually when the high temperature is over 90°, which is cooler than most places in California.
January has the coldest nighttime temperatures for Hillsborough with an average of 42.1°. This is warmer than most places in California.
In Hillsborough, there are 3.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.
In Hillsborough, 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 Hillsborough 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 August, July and September.
January is the wettest month in Hillsborough with 4.6 inches of rain, and the driest month is July with 0.1 inches. The wettest season is Spring with 58% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 23.3 inches in Hillsborough means that it is wetter than most places in California.
January is the rainiest month in Hillsborough with 11.9 days of rain, and June is the driest month with only 2.2 rainy days. There are 81.0 rainy days annually in Hillsborough, which is rainier than most places in California. The rainiest season is Spring when it rains 43% of the time and the driest is Autumn with only a 9% chance of a rainy day.
There is rarely any recorded snowfall in Hillsborough, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Hillsborough.
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