Climateby Month

Antioch, CA climate by month

NOAA 1991-2020 normals · 41 ft elevation

Antioch has hot summers and cool winters. Highs peak at 91°F in July and fall to 56°F in January. The wettest month is January (about 10 wet days) and the driest is July (about 0). Snow is rare. By our comfort score the best months are April and May.

Warmest month
91°F
July normal high
Coldest month
40°F
January normal low
Wet days a year
56
17.7 in of precipitation
Muggy days a year
0
dew point 65°F or higher

How warm is Antioch?

Normal highs range from 56°F in January to 91°F in July.

40°60°80°100° January: normal high 56°F (13°C), low 40°F (4°C) 56° 40° February: normal high 61°F (16°C), low 44°F (7°C) March: normal high 67°F (19°C), low 47°F (8°C) April: normal high 72°F (22°C), low 50°F (10°C) May: normal high 79°F (26°C), low 54°F (12°C) June: normal high 86°F (30°C), low 59°F (15°C) July: normal high 91°F (33°C), low 61°F (16°C) 91° 61° August: normal high 90°F (32°C), low 60°F (16°C) September: normal high 87°F (31°C), low 59°F (15°C) October: normal high 78°F (26°C), low 54°F (12°C) November: normal high 65°F (18°C), low 46°F (8°C) December: normal high 56°F (13°C), low 40°F (4°C) JFMAMJJASOND

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

How rainy is Antioch?

January has the most wet days (about 10); the year brings about 18 in of precipitation.

January: 10 wet days 10 February: 10 wet days March: 8 wet days April: 5 wet days May: 3 wet days June: 1 wet days July: 0 wet days 0 August: 0 wet days September: 1 wet days October: 3 wet days November: 6 wet days December: 9 wet days JFMAMJJASOND

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

How humid is Antioch?

Muggy days (dew point 65°F or higher) are rare in any month.

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: 0 muggy days August: 0 muggy days September: 0 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 Travis Air Force Base, 19 mi NNW of the city center (the nearest airport with complete hourly records).

How much daylight?

Daylight ranges from about 9.6 hours in December to 14.8 hours in June.

January: 9.9 hours of daylight February: 10.8 hours of daylight March: 12.0 hours of daylight April: 13.2 hours of daylight May: 14.2 hours of daylight June: 14.8 hours of daylight 14.8 July: 14.5 hours of daylight August: 13.6 hours of daylight September: 12.4 hours of daylight October: 11.2 hours of daylight November: 10.1 hours of daylight December: 9.6 hours of daylight 9.6 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Antioch, 1991-2020
MonthHighLowPrecip.Wet daysMuggy daysDaylight
January 56°F40°F 3.5 in10 0 9.9 h
February 61°F44°F 3.6 in10 0 10.8 h
March 67°F47°F 2.6 in8 0 12.0 h
April 72°F50°F 1.2 in5 0 13.2 h
May 79°F54°F 0.6 in3 0 14.2 h
June 86°F59°F 0.1 in1 0 14.8 h
July 91°F61°F 0.0 in0 0 14.5 h
August 90°F60°F 0.02 in0 0 13.6 h
September 87°F59°F 0.06 in1 0 12.4 h
October 78°F54°F 0.7 in3 0 11.2 h
November 65°F46°F 1.9 in6 0 10.1 h
December 56°F40°F 3.5 in9 0 9.6 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 Antioch

By our comfort score, the best months are April and May.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 46370
Feb 54870
Mar 721960
Apr 781940
May 771724
Jun 607012
Jul 481020
Aug 492016
Sep 546011
Oct 732022
Nov 651640
Dec 44370

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 Antioch

The last spring frost typically comes around Jan 12, and the first fall frost around Dec 19, leaving 343 frost-free days in a typical year.

Frost and freeze dates for Antioch
Typical date1 year in 10
Last spring frost (32°F)Jan 12after Feb 1
First fall frost (32°F)Dec 19before Nov 29
Hard freeze (28°F)in about 35% of years; no typical date
Frost-free season343 daysunder 315 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Antioch Pumping Plt #3 (USC00040232), NOAA 1991-2020 freeze probabilities. Frost dates for every city in California.

Hottest and coldest readings, 1991-2020

The highest reading was 111°F (June 16, 2011); the lowest was 22°F (December 23, 1998).

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

Near Antioch

Similar climates elsewhere

Where the numbers come from

  • Temperature and frost dates: Antioch Pumping Plt #3 (USC00040232), 3.3 mi ESE of the city center, 60 ft . NOAA normals and daily records, 1991-2020.
  • Rain: Concord Wwtp (USC00041967), 14 mi W of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
  • Snowfall and snow depth: Fairfield (USC00042934), 23 mi NW of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
  • Humidity and wind by hour and cloud cover: Travis AFB (USW00023202), 19 mi NNW of the city center, 59 ft . NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Travis Air Force Base (745160-23202), 19 mi NNW of the city center, 62 ft . Hourly observations, 1991-2020.

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