Zip 91001 (Altadena, CA) Climate

The climate in 91001 Altadena, CA is generally mild throughout the year. Summers are hot and dry, while winters tend to be more mild and wet. In the summertime, temperatures average in the 80s and 90s, while during the winter temperatures usually stay between 40°F and 60°F. The area receives an average of 18 inches of rain each year, which mostly falls during the months of December through March. Although it can get quite hot in the summer time, Altadena’s mild climate makes it a great place to live all year round.

Altadena (zip 91001), California gets 23 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Altadena (zip 91001) averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 291 sunny days per year in Altadena (zip 91001). The US average is 205 sunny days.

Altadena (zip 91001) gets some kind of precipitation, on average, 37 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 86 degrees
Winter Low: the January low is 47
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 the 91001 zip code is 9.1 (10=best), which means it is one of the most pleasant places in California.

9.4 Summer - 8.7 Winter

June, October and May are the most pleasant months in the 91001 zip code, while January and February are the least comfortable months.

Climate	Altadena, California	United States
	22.6 in.	38.1 in.
	0.0 in.	27.8 in.
	36.9 days	106.2 days
	291 days	205 days
	86.2°	85.8°
	47.0°	21.7°
	9.1	7
	6.2	4.3
	1318 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 91001 zip code with an average high temperature of 87.9°, which ranks it as about average compared to other places in California. In the 91001 zip code, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for the 91001 zip code are October, May and June.

In the 91001 zip code, there are 43.4 days annually when the high temperature is over 90°, which is about average compared to other places in California.

December has the coldest nighttime temperatures for the 91001 zip code with an average of 46.2°. This is one of the warmest places in California.

In the 91001 zip code, there are 0.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In the 91001 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 91001 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 91001 zip code with 5.5 inches of rain, and the driest month is July with 0.1 inches. The wettest season is Spring with 59% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 22.6 inches in the 91001 zip code means that it is wetter than most places in California.

February is the rainiest month in the 91001 zip code with 6.3 days of rain, and July is the driest month with only 0.4 rainy days. There are 36.9 rainy days annually in the 91001 zip code, which is less rainy than most places in California. The rainiest season is Spring when it rains 46% 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 91001 zip code, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in the 91001 zip code.

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