Twentynine Palms, California climate: Normal weather by month, frost dates and records
Twentynine Palms's normal year runs from 40°F December nights to 104°F July afternoons, with 3.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 21.3°C, December lows of 4°C, July highs of 40°C, 98 mm of precipitation a year.
- NOAA stationTwentynine Palms
- Station IDUSC00049099
- Location34.13°N 116.04°W
- Elevation1,975 ft (602 m)
- Population26,563
On October 23, the normal high in Twentynine Palms is 82°F and the normal low 55°F, and the chance of measurable rain or snow is 4%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Twentynine Palms.
- Jan 63° 42°
- Feb 67° 44°
- Mar 74° 49°
- Apr 81° 55°
- May 90° 63°
- Jun 99° 71°
- Jul 104° 77°
- Aug 103° 76°
- Sep 97° 69°
- Oct 85° 58°
- Nov 72° 47°
- Dec 62° 40°
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 Twentynine Palms each month?
July is the warmest month, with normal highs of 104°F; December the coldest, with normal lows of 40°F. The most precipitation falls in August (0.65 in), the least in June (0.00 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 63°F | 42°F | 52.6°F | 0.50 | 4 | <1 | 5 | 10 h 10 min |
| February | 67°F | 44°F | 55.7°F | 0.56 | 3 | <1 | 2 | 11 h |
| March | 74°F | 49°F | 61.7°F | 0.35 | 2 | 1 | 1 | 11 h 50 min |
| April | 81°F | 55°F | 67.8°F | 0.12 | 1 | 7 | <1 | 13 h |
| May | 90°F | 63°F | 76.4°F | 0.05 | 1 | 19 | <1 | 13 h 50 min |
| June | 99°F | 71°F | 85.1°F | 0.00 | <1 | 28 | <1 | 14 h 20 min |
| July | 104°F | 77°F | 90.7°F | 0.40 | 2 | 31 | <1 | 14 h 10 min |
| August | 103°F | 76°F | 89.6°F | 0.65 | 2 | 31 | <1 | 13 h 30 min |
| September | 97°F | 69°F | 82.9°F | 0.34 | 2 | 27 | <1 | 12 h 30 min |
| October | 85°F | 58°F | 71.2°F | 0.15 | 1 | 11 | <1 | 11 h 20 min |
| November | 72°F | 47°F | 59.3°F | 0.19 | 1 | <1 | 2 | 10 h 30 min |
| December | 62°F | 40°F | 50.9°F | 0.56 | 2 | <1 | 6 | 9 h 50 min |
| Year (annual) | 83°F | 58°F | 70.3°F | 3.87 | 21 | 154 | 17 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 17°C | 5°C | 11.4°C | 13 mm |
| February | 20°C | 7°C | 13.2°C | 14 mm |
| March | 23°C | 10°C | 16.5°C | 9 mm |
| April | 27°C | 13°C | 19.9°C | 3 mm |
| May | 32°C | 17°C | 24.7°C | 1 mm |
| June | 37°C | 22°C | 29.5°C | 0 mm |
| July | 40°C | 25°C | 32.6°C | 10 mm |
| August | 39°C | 25°C | 32.0°C | 17 mm |
| September | 36°C | 21°C | 28.3°C | 9 mm |
| October | 29°C | 14°C | 21.8°C | 4 mm |
| November | 22°C | 8°C | 15.2°C | 5 mm |
| December | 17°C | 4°C | 10.5°C | 14 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00049099; 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 Twentynine Palms?
Normal highs sit between 65°F and 85°F in February, March, April, October and November. Of those, April 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 USC00049099.
When is the last frost in Twentynine Palms?
In Twentynine Palms, the last spring frost (32°F) comes after January 24 in half of years and after February 22 in one year in ten; the first autumn frost comes before December 10 in half of years and before November 24 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
- January 241 year in 10 after February 22; 9 in 10 after December 22
- First autumn frost, half of years before
- December 101 year in 10 before November 24; 9 in 10 before January 1
NOAA puts the median frost-free season at 321 days, and the season without a hard freeze (28°F) at 357 days.
A hard freeze (28°F) comes after January 3 in half of springs and before December 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Twentynine Palms in zone 9b in ZIP code 92278. By the map's own method, the average of each year's coldest night over 1991-2020, Twentynine Palms's NOAA station is in zone 9a: the coldest night of a typical year reaches 24°F (24 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00049099; 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 Twentynine Palms?
In a normal year in Twentynine Palms, 154 days a year reach 90°F (89 of them 100°F or more), 17 nights fall to 32°F or colder and 21 days bring measurable precipitation.
- Days at 90°F or more
- 154a normal year
- Days at 100°F or more
- 89a normal year
- Nights at 32°F or colder
- 17a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 21a normal year
The highest temperature in this station's record (since 1935) is 118°F, on July 11, 1961; the lowest is 11°F, on January 22, 1937.
The wettest calendar year on that record is 1983, with 12.32 in; the snowiest season is 1948–49, with 19.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00049099; records: ACIS (NOAA Regional Climate Centers), station USC00049099. Records use complete months only; a month missing more than three days is left out.
How sunny is Twentynine Palms?
Over a year 93% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Twentynine Palms, 5.9 kWh per square metre a day. June is the sunniest month (97%) and December the cloudiest (86%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 87% | 3.4 |
| February | 87% | 4.4 |
| March | 90% | 5.8 |
| April | 93% | 7.2 |
| May | 95% | 8.1 |
| June | 97% | 8.6 |
| July | 93% | 7.8 |
| August | 94% | 7.3 |
| September | 95% | 6.3 |
| October | 94% | 5.0 |
| November | 91% | 3.7 |
| December | 86% | 3.0 |
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 Twentynine Palms need?
A normal year in Twentynine Palms brings 1,511 heating degree days, 72% fewer than the median U.S. place (5,373), and 3,482 cooling degree days, 3.8 times the median (908). Two months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 7,576 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 387 | 1 |
| February | 267 | 5 |
| March | 143 | 41 |
| April | 48 | 132 |
| May | 7 | 360 |
| June | 0 | 602 |
| July | 0 | 797 |
| August | 0 | 761 |
| September | 0 | 537 |
| October | 26 | 219 |
| November | 198 | 27 |
| December | 436 | 0 |
| Year (annual) | 1,511 | 3,482 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00049099. 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 Twentynine Palms been warmer than normal lately?
2025 averaged 71.5°F, 1.2°F above the 1991-2020 normal of 70.3°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 71.9°F | +1.6°F | 2.99 |
| 2022 | 71.2°F | +0.9°F | 1.81 |
| 2023 | 69.6°F | −0.7°F | 3.47 |
| 2024 | 71.9°F | +1.6°F | 3.11 |
| 2025 | 71.5°F | +1.2°F | 6.14 |
Over 61 complete years from 1936 to 2025, the station's annual mean temperature rose at a fitted 5.0°F per century (+0.28°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00049099; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Twentynine Palms's climate compare?
Twentynine Palms is warmer than 209 of the other 218 places with their own NOAA record in California, and wetter than 8. Across the 7,247 U.S. stations with normals, its annual mean of 70.3°F is warmer than 95%.
In the Köppen classification computed from these normals, Twentynine Palms is BWh: hot desert. 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.
Questions about Twentynine Palms's climate
What is the coldest month in Twentynine Palms?
December, with a normal high of 62°F and a normal low of 40°F. The warmest is July (104°F by day, 77°F at night).
What is the rainiest month in Twentynine Palms?
August, with 0.65 in of precipitation in a normal year; the driest is June with 0.00 in.
What plant hardiness zone is Twentynine Palms in?
The USDA's 2023 map puts Twentynine Palms in zone 9b in ZIP code 92278. By the same method at Twentynine Palms's NOAA station, the coldest night of a typical year reaches 24°F (24 years, 1991-2020): zone 9a.
How late can frost come in Twentynine Palms?
In half of years the last 32°F night comes after January 24; in one year in ten it comes after February 22. Waiting until February 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Joshua Tree, CA14 miles from this station, 65.5°F a year
- Yucca Valley, CA20 miles from this station, 62.9°F a year
- Yucca Mesa, CA22 miles from this station, 64.9°F a year
- Morongo Valley, CA30 miles from this station, 64.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made