Martinez, California climate: Normal weather by month, frost dates and records
Martinez's normal year runs from 35°F January nights to 88°F July afternoons, with 19.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.6°C, January lows of 2°C, July highs of 31°C, 493 mm of precipitation a year.
- NOAA stationMartinez Water Treatment Plant
- Station IDUSC00045378
- Location38.01°N 122.11°W
- Elevation40 ft (12 m)
- Population37,006
On October 14, the normal high in Martinez is 77°F and the normal low 46°F, and the chance of measurable rain or snow is 9%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Martinez.
- Jan 56° 35°
- Feb 61° 37°
- Mar 66° 40°
- Apr 71° 43°
- May 78° 46°
- Jun 85° 50°
- Jul 88° 51°
- Aug 87° 51°
- Sep 84° 50°
- Oct 76° 46°
- Nov 64° 39°
- Dec 57° 35°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Martinez each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 35°F. The most precipitation falls in January (3.86 in), the least in July (0.00 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 56°F | 35°F | 45.6°F | 3.86 | 11 | <1 | 6 | 9 h 50 min |
| February | 61°F | 37°F | 49.1°F | 3.81 | 11 | <1 | 2 | 10 h 50 min |
| March | 66°F | 40°F | 53.0°F | 2.74 | 9 | <1 | 1 | 11 h 50 min |
| April | 71°F | 43°F | 56.8°F | 1.32 | 6 | 1 | <1 | 13 h 10 min |
| May | 78°F | 46°F | 62.0°F | 0.62 | 3 | 3 | <1 | 14 h 10 min |
| June | 85°F | 50°F | 67.4°F | 0.25 | 1 | 9 | <1 | 14 h 50 min |
| July | 88°F | 51°F | 69.8°F | 0.00 | <1 | 14 | <1 | 14 h 30 min |
| August | 87°F | 51°F | 68.9°F | 0.03 | <1 | 11 | <1 | 13 h 40 min |
| September | 84°F | 50°F | 66.9°F | 0.06 | 1 | 8 | <1 | 12 h 30 min |
| October | 76°F | 46°F | 60.8°F | 0.79 | 3 | 2 | <1 | 11 h 20 min |
| November | 64°F | 39°F | 51.9°F | 2.10 | 7 | <1 | 1 | 10 h 10 min |
| December | 57°F | 35°F | 45.6°F | 3.81 | 10 | <1 | 7 | 9 h 30 min |
| Year (annual) | 73°F | 44°F | 58.2°F | 19.39 | 62 | 47 | 16 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 13°C | 2°C | 7.6°C | 98 mm |
| February | 16°C | 3°C | 9.5°C | 97 mm |
| March | 19°C | 5°C | 11.7°C | 70 mm |
| April | 22°C | 6°C | 13.8°C | 34 mm |
| May | 26°C | 8°C | 16.7°C | 16 mm |
| June | 29°C | 10°C | 19.7°C | 6 mm |
| July | 31°C | 11°C | 21.0°C | 0 mm |
| August | 31°C | 10°C | 20.5°C | 1 mm |
| September | 29°C | 10°C | 19.4°C | 2 mm |
| October | 24°C | 8°C | 16.0°C | 20 mm |
| November | 18°C | 4°C | 11.1°C | 53 mm |
| December | 14°C | 2°C | 7.6°C | 97 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00045378; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Martinez?
Normal highs sit between 65°F and 85°F in March, April, May, June, September and October. Of those, September has the fewest days with rain (1).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00045378.
When is the last frost in Martinez?
In Martinez, the last spring frost (32°F) comes after February 28 in half of years and after April 5 in one year in ten; the first autumn frost comes before November 22 in half of years and before November 7 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- February 281 year in 10 after April 5; 9 in 10 after January 29
- First autumn frost, half of years before
- November 221 year in 10 before November 7; 9 in 10 before December 10
NOAA puts the median frost-free season at 266 days, and the season without a hard freeze (28°F) at 323 days.
A hard freeze (28°F) comes after January 23 in half of springs and before December 9 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Martinez in zone 9b in ZIP code 94553. By the map's own method, the average of each year's coldest night over 1991-2020, Martinez's NOAA station is in zone 9b: the coldest night of a typical year reaches 26°F (27 complete years).
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00045378; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Martinez?
In a normal year in Martinez, 47 days a year reach 90°F (6 of them 100°F or more), 16 nights fall to 32°F or colder and 62 days bring measurable precipitation.
- Days at 90°F or more
- 47a normal year
- Days at 100°F or more
- 6a normal year
- Nights at 32°F or colder
- 16a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 62a normal year
The highest temperature in this station's record (since 1970) is 115°F, on July 14, 1972; the lowest is 19°F, on December 22, 1990.
The wettest calendar year on that record is 1983, with 39.09 in.
Source: NOAA NCEI 1991-2020 annual normals, station USC00045378; records: ACIS (NOAA Regional Climate Centers), station USC00045378. Records use complete months only; a month missing more than three days is left out.
How sunny is Martinez?
Over a year 87% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Martinez, 5.1 kWh per square metre a day. July is the sunniest month (95%) and December the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 74% | 2.3 |
| February | 77% | 3.3 |
| March | 78% | 4.6 |
| April | 84% | 6.1 |
| May | 88% | 7.3 |
| June | 93% | 8.1 |
| July | 95% | 8.0 |
| August | 94% | 7.1 |
| September | 93% | 5.8 |
| October | 88% | 4.2 |
| November | 81% | 2.8 |
| December | 72% | 2.0 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Martinez need?
A normal year in Martinez brings 3,026 heating degree days, 44% fewer than the median U.S. place (5,373), and 544 cooling degree days, 40% fewer than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,421 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 603 | 0 |
| February | 444 | 0 |
| March | 371 | 0 |
| April | 251 | 5 |
| May | 129 | 35 |
| June | 33 | 105 |
| July | 7 | 156 |
| August | 10 | 132 |
| September | 33 | 90 |
| October | 151 | 21 |
| November | 395 | 0 |
| December | 600 | 0 |
| Year (annual) | 3,026 | 544 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00045378. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Martinez been warmer than normal lately?
Over 35 complete years from 1971 to 2017, the station's annual mean temperature rose at a fitted 4.1°F per century (+0.23°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Martinez's climate compare?
Martinez is warmer than 65 of the other 218 places with their own NOAA record in California, and wetter than 131. Across the 7,247 U.S. stations with normals, its annual mean of 58.2°F is warmer than 69%.
In the Köppen classification computed from these normals, Martinez is Csb: temperate, dry-summer, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Martinez share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Vine Hill, CA3,617 people · 1 mi E
- Mountain View, CA2,072 people · 0 mi SW
- Alhambra Valley, CA937 people · 3 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Martinez's climate
What is the coldest month in Martinez?
January, with a normal high of 56°F and a normal low of 35°F. The warmest is July (88°F by day, 51°F at night).
Does it snow in Martinez?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Martinez?
January, with 3.86 in of precipitation in a normal year; the driest is July with 0.00 in.
What plant hardiness zone is Martinez in?
The USDA's 2023 map puts Martinez in zone 9b in ZIP code 94553. By the same method at Martinez's NOAA station, the coldest night of a typical year reaches 26°F (27 years, 1991-2020): zone 9b.
How late can frost come in Martinez?
In half of years the last 32°F night comes after February 28; in one year in ten it comes after April 5. Waiting until April 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Martinez in OctoberThis month day by day, its records and recent years
- California climateThe statewide normals and every place in the state
- Concord Wastewater Treatment Plant, CA3 miles from this station, 62.4°F a year
- Concord, CA4 miles from this station, 62.0°F a year
- Vallejo, CA7 miles from this station, 61.6°F a year
- Berkeley, CA12 miles from this station, 58.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made