Climateby Month

Pasadena, CA climate by month

NOAA 1991-2020 normals · 863 ft elevation

Summers in Pasadena are hot; winters are mild. Highs peak at 91°F in August and fall to 67°F in December. The wettest month is February (about 8 wet days) and the driest is August (about 0). Snow is rare. The most comfortable time to visit is May.

Warmest month
91°F
August normal high
Coldest month
45°F
December normal low
Wet days a year
43
20.1 in of precipitation
Muggy days a year
3
dew point 65°F or higher

How warm is Pasadena?

Normal highs range from 67°F in December to 91°F in August.

40°50°60°70°80°90°100° January: normal high 68°F (20°C), low 46°F (8°C) February: normal high 69°F (21°C), low 46°F (8°C) March: normal high 73°F (23°C), low 48°F (9°C) April: normal high 76°F (24°C), low 51°F (11°C) May: normal high 78°F (26°C), low 54°F (12°C) June: normal high 84°F (29°C), low 58°F (14°C) July: normal high 89°F (32°C), low 62°F (17°C) August: normal high 91°F (33°C), low 63°F (17°C) 91° 63° September: normal high 90°F (32°C), low 62°F (17°C) October: normal high 83°F (28°C), low 56°F (13°C) November: normal high 75°F (24°C), low 50°F (10°C) December: normal high 67°F (19°C), low 45°F (7°C) 67° 45° JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Pasadena?

February has the most wet days (about 8); the year brings about 20 in of precipitation.

January: 7 wet days February: 8 wet days 8 March: 6 wet days April: 3 wet days May: 3 wet days June: 2 wet days July: 1 wet days August: 0 wet days 0 September: 1 wet days October: 3 wet days November: 3 wet days December: 6 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How humid is Pasadena?

Muggy days peak in July, at about 1 days.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 0 muggy days July: 1 muggy days 1 August: 1 muggy days September: 1 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Burbank-Glendale-Pasa Arpt, 13 mi WNW of the city center.

How much daylight?

Daylight ranges from about 9.9 hours in December to 14.4 hours in June.

January: 10.2 hours of daylight February: 11.0 hours of daylight March: 12.0 hours of daylight April: 13.1 hours of daylight May: 13.9 hours of daylight June: 14.4 hours of daylight 14.4 July: 14.2 hours of daylight August: 13.4 hours of daylight September: 12.4 hours of daylight October: 11.3 hours of daylight November: 10.4 hours of daylight December: 9.9 hours of daylight 9.9 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Pasadena, 1991-2020
MonthHighLowPrecip.Wet daysMuggy daysDaylight
January 68°F46°F 4.5 in7 0 10.2 h
February 69°F46°F 5.2 in8 0 11.0 h
March 73°F48°F 3.0 in6 0 12.0 h
April 76°F51°F 1.1 in3 0 13.1 h
May 78°F54°F 0.5 in3 0 13.9 h
June 84°F58°F 0.2 in2 0 14.4 h
July 89°F62°F 0.06 in1 1 14.2 h
August 91°F63°F 0.03 in0 1 13.4 h
September 90°F62°F 0.2 in1 1 12.4 h
October 83°F56°F 0.8 in3 0 11.3 h
November 75°F50°F 1.1 in3 0 10.4 h
December 67°F45°F 3.3 in6 0 9.9 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Pasadena

By our comfort score, the best month is May.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 661750
Feb 661560
Mar 741941
Apr 751823
May 791913
Jun 671006
Jul 491015
Aug 440019
Sep 463016
Oct 591118
Nov 711922
Dec 661740

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Pasadena

A night at 32°F or below happens in about 13% of years in Pasadena, so there is no typical frost date. In most years there is no frost at all.

Station: Pasadena (USC00046719), NOAA 1991-2020 freeze probabilities. Frost dates for every city in California.

Hottest and coldest readings, 1991-2020

The highest reading was 115°F (September 6, 2020); the lowest was 31°F (January 14, 2007).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Pasadena

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain and frost dates: Pasadena (USC00046719), 0.0 mi NNW of the city center, 864 ft . NOAA normals and daily records, 1991-2020.
  • Snowfall and snow depth: U C L A (USC00049152), 18 mi WSW of the city center, 430 ft (433 ft lower than the city). NOAA normals and daily records, 1991-2020.
  • Humidity and wind by hour and cloud cover: Burbank Glendale Pasadena Airport (USW00023152), 13 mi WNW of the city center, 741 ft (122 ft lower than the city). NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Burbank-Glendale-Pasa Arpt (722880-23152), 13 mi WNW of the city center, 731 ft (132 ft lower than the city). Hourly observations, 1991-2020.

Distances from the city center (USGS). Methodology · Report an error