Climate and average weather in Twentynine Palms
In Twentynine Palms, the summers are sweltering, dry, and clear and the winters are mild and mostly clear.
Over the course of the year, the temperature in Twentynine Palms typically varies from 42°F to 101°F, and is rarely below 34°F or above 107°F. July is the hottest month of the year, while December is the coldest.
Based on the travel score, the best times of year to visit Twentynine Palms for warm-weather activities are from late February to early May and early October to late November.
- Hottest
- Jul
- 101°
- Coldest
- Dec
- 42°
- Wettest
- Feb
- 0.8 in
- Driest
- Jun
- 0.0 in
- Rain / yr
- 4.1 in
- 20 wet days
- Daylight
- 9.7–14.3 h
- shortest–longest
- Elevation
- 1,988 ft
- 34.1°N
- Clearest
- Jun
- 13% cloud
Twentynine Palms is city in San Bernardino County, California, United States.
- Density
- 170/km²
- people per km²
- Founded
- 1920
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Twentynine Palms weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around late February to early May.
Temperature through the year
Daily average highs and lows in Twentynine Palms, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 3.9 months, from May 28 to September 24, with daily high temperatures above 90°F. The hottest month of the year in Twentynine Palms is July, with an average high of 101°F and low of 77°F.
The cool season lasts 3.4 months, from November 20 to March 1, with daily high temperatures below 67°F. The coldest month of the year in Twentynine Palms is December, with an average low of 42°F and high of 59°F.
Days typically run about 22°F warmer than nights, with the widest day–night swing (around 26°F) in June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 61 | 64 | 71 | 78 | 87 | 96 | 101 | 100 | 93 | 81 | 68 | 59 |
| Avg low (°F) | 43 | 45 | 49 | 54 | 62 | 70 | 77 | 76 | 69 | 59 | 48 | 42 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| Jan | 61 | 43 |
| Feb | 64 | 45 |
| Mar | 71 | 49 |
| Apr | 78 | 54 |
| May | 87 | 62 |
| Jun | 96 | 70 |
| Jul | 101 | 77 |
| Aug | 100 | 76 |
| Sep | 93 | 69 |
| Oct | 81 | 59 |
| Nov | 68 | 48 |
| Dec | 59 | 42 |
How hot and cold Twentynine Palms really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, Twentynine Palms feels like about 101°F (around July 16). About 123 days a year carry some heat stress, peaking in July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°F) | 61 | 64 | 71 | 78 | 87 | 96 | 101 | 99 | 93 | 81 | 68 | 59 |
| Air high (°F) | 61 | 64 | 71 | 78 | 87 | 96 | 101 | 100 | 93 | 81 | 68 | 59 |
| Feels-like low (°F) | 39 | 42 | 48 | 54 | 62 | 70 | 77 | 76 | 69 | 59 | 47 | 38 |
| Air low (°F) | 43 | 45 | 49 | 54 | 62 | 70 | 77 | 76 | 69 | 59 | 48 | 42 |
| Feels-like high (°F) | Air high (°F) | Feels-like low (°F) | Air low (°F) | |
|---|---|---|---|---|
| Jan | 61 | 61 | 39 | 43 |
| Feb | 64 | 64 | 42 | 45 |
| Mar | 71 | 71 | 48 | 49 |
| Apr | 78 | 78 | 54 | 54 |
| May | 87 | 87 | 62 | 62 |
| Jun | 96 | 96 | 70 | 70 |
| Jul | 101 | 101 | 77 | 77 |
| Aug | 99 | 100 | 76 | 76 |
| Sep | 93 | 93 | 69 | 69 |
| Oct | 81 | 81 | 59 | 59 |
| Nov | 68 | 68 | 47 | 48 |
| Dec | 59 | 59 | 38 | 42 |
Average hourly temperature in Twentynine Palms
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on July afternoons, near 101°F, and coldest before dawn in December, near 42°F.
Twentynine Palms weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 61° / 43° | 0.6 | 2.6 | 10 | 6.2 |
| Feb | 64° / 45° | 0.8 | 3 | 10.7 | 7.2 |
| Mar | 71° / 49° | 0.4 | 2.1 | 11.7 | 8.3 |
| Apr | 78° / 54° | 0.2 | 1.2 | 12.8 | 8.7 |
| May | 87° / 62° | 0.1 | 0.6 | 13.8 | 6.4 |
| Jun | 96° / 70° | 0.0 | 0.2 | 14.2 | 3.0 |
| Jul | 101° / 77° | 0.3 | 2.4 | 14 | 1.2 |
| Aug | 100° / 76° | 0.4 | 2.4 | 13.3 | 1.6 |
| Sep | 93° / 69° | 0.2 | 1.5 | 12.2 | 4.1 |
| Oct | 81° / 59° | 0.3 | 0.9 | 11.1 | 8.2 |
| Nov | 68° / 48° | 0.2 | 0.9 | 10.2 | 8.2 |
| Dec | 59° / 42° | 0.6 | 2.2 | 9.8 | 5.8 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Twentynine Palms gets about 4.1 in of precipitation a year. On a typical day the chance of rain is mostly dry, but that rises and falls sharply with the seasons.
The wetter season lasts 3.9 months, from around Dec 1 to Mar 29, peaking in February at about 12% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 13.
February is the wettest month by volume, with 0.8 in over about 3 wet days; June is the driest, with 0.0 in.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 8 | 10 | 7 | 4 | 2 | 1 | 7 | 8 | 5 | 3 | 3 | 7 |
| Rain days | 3 | 3 | 2 | 1 | 1 | 0 | 2 | 2 | 2 | 1 | 1 | 2 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 8 | 3 |
| Feb | 10 | 3 |
| Mar | 7 | 2 |
| Apr | 4 | 1 |
| May | 2 | 1 |
| Jun | 1 | 0 |
| Jul | 7 | 2 |
| Aug | 8 | 2 |
| Sep | 5 | 2 |
| Oct | 3 | 1 |
| Nov | 3 | 1 |
| Dec | 7 | 2 |
Monthly rainfall
Over a full year, Twentynine Palms collects about 4.1 in of rain across 20 wet days — roughly 0.3 in in an average month.
It doesn’t fall evenly. February is the wettest month with 0.8 in, while June is the driest at just 0.0 in. The three wettest months alone bring about 48% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (in) | 0.6 | 0.8 | 0.4 | 0.2 | 0.1 | 0.0 | 0.3 | 0.4 | 0.2 | 0.3 | 0.2 | 0.6 |
| Rain days | 3 | 3 | 2 | 1 | 1 | 0 | 2 | 2 | 2 | 1 | 1 | 2 |
| Rainfall (in) | Rain days | |
|---|---|---|
| Jan | 0.6 | 3 |
| Feb | 0.8 | 3 |
| Mar | 0.4 | 2 |
| Apr | 0.2 | 1 |
| May | 0.1 | 1 |
| Jun | 0.0 | 0 |
| Jul | 0.3 | 2 |
| Aug | 0.4 | 2 |
| Sep | 0.2 | 2 |
| Oct | 0.3 | 1 |
| Nov | 0.2 | 1 |
| Dec | 0.6 | 2 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Twentynine Palms, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around April 14 and lasts for 6.8 months, ending around November 6. The clearest month is September, when the sky is clear, mostly clear, or partly cloudy 94% of the time on average.
The cloudier part of the year begins around November 7 and lasts for 5.2 months, ending around April 13. The cloudiest month is January, when it is overcast or mostly cloudy 31% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 69 | 71 | 76 | 83 | 87 | 92 | 90 | 91 | 94 | 89 | 80 | 71 |
| Cloudier (%) | 31 | 29 | 24 | 17 | 13 | 8 | 10 | 9 | 6 | 11 | 20 | 29 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 69 | 31 |
| Feb | 71 | 29 |
| Mar | 76 | 24 |
| Apr | 83 | 17 |
| May | 87 | 13 |
| Jun | 92 | 8 |
| Jul | 90 | 10 |
| Aug | 91 | 9 |
| Sep | 94 | 6 |
| Oct | 89 | 11 |
| Nov | 80 | 20 |
| Dec | 71 | 29 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 14, brings about 14 h 18 min of light; the shortest, around December 14, only 9 h 42 min — a swing of roughly 4 h 36 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.0 | 10.7 | 11.7 | 12.8 | 13.8 | 14.2 | 14.0 | 13.3 | 12.2 | 11.1 | 10.2 | 9.8 |
| Sunrise (AM) | 6:55 | 6:37 | 6:02 | 5:19 | 4:47 | 4:37 | 4:48 | 5:10 | 5:32 | 5:55 | 6:24 | 6:48 |
| Sunset (PM) | 4:52 | 5:21 | 5:46 | 6:10 | 6:34 | 6:52 | 6:52 | 6:27 | 5:45 | 5:03 | 4:35 | 4:32 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 10.0 | 6:55 | 4:52 |
| Feb | 10.7 | 6:37 | 5:21 |
| Mar | 11.7 | 6:02 | 5:46 |
| Apr | 12.8 | 5:19 | 6:10 |
| May | 13.8 | 4:47 | 6:34 |
| Jun | 14.2 | 4:37 | 6:52 |
| Jul | 14.0 | 4:48 | 6:52 |
| Aug | 13.3 | 5:10 | 6:27 |
| Sep | 12.2 | 5:32 | 5:45 |
| Oct | 11.1 | 5:55 | 5:03 |
| Nov | 10.2 | 6:24 | 4:35 |
| Dec | 9.8 | 6:48 | 4:32 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Twentynine Palms averages about 22 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 16 and 27 days.
The sunnier stretch runs 6.9 months, from around Apr 18 to Nov 12. The sunniest month is September, with roughly 26 sunny days (brilliant).
The greyest month is February, down near 17 sunny days — about 36% fewer than the September peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 18 | 15 | 18 | 21 | 24 | 26 | 25 | 26 | 26 | 25 | 21 | 18 |
| Sky | Bright | Bright | Bright | Bright | Brilliant | Brilliant | Brilliant | Brilliant | Brilliant | Brilliant | Bright | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 18 | Bright |
| Feb | 15 | Bright |
| Mar | 18 | Bright |
| Apr | 21 | Bright |
| May | 24 | Brilliant |
| Jun | 26 | Brilliant |
| Jul | 25 | Brilliant |
| Aug | 26 | Brilliant |
| Sep | 26 | Brilliant |
| Oct | 25 | Brilliant |
| Nov | 21 | Bright |
| Dec | 18 | Bright |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Twentynine Palms, the air stays dry or comfortable essentially all year. Even in July, the muggiest month, it feels humid or worse only about 9% of the time — humidity is not something you need to plan around here.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 99 | 82 | 80 | 89 | 98 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 1 | 9 | 11 | 7 | 1 | 0 | 0 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 7 | 3 | 1 | 0 | 0 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 2 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| Jan | 100 | 0 | 0 | 0 |
| Feb | 100 | 0 | 0 | 0 |
| Mar | 100 | 0 | 0 | 0 |
| Apr | 100 | 0 | 0 | 0 |
| May | 100 | 0 | 0 | 0 |
| Jun | 99 | 1 | 0 | 0 |
| Jul | 82 | 9 | 6 | 3 |
| Aug | 80 | 11 | 7 | 2 |
| Sep | 89 | 7 | 3 | 0 |
| Oct | 98 | 1 | 1 | 0 |
| Nov | 100 | 0 | 0 | 0 |
| Dec | 100 | 0 | 0 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Wind in Twentynine Palms is steady company: average speeds sit near 5 mph — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 5 | 5 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| Jan | 5 | calm |
| Feb | 5 | calm |
| Mar | 6 | calm |
| Apr | 6 | calm |
| May | 6 | calm |
| Jun | 5 | calm |
| Jul | 5 | calm |
| Aug | 5 | calm |
| Sep | 5 | calm |
| Oct | 5 | calm |
| Nov | 5 | calm |
| Dec | 5 | calm |
Best time to visit Twentynine Palms
To characterize how pleasant the weather is in Twentynine Palms throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early March, Twentynine Palms is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 64°F and 82°F. Based on this score, the best times of year to visit Twentynine Palms for general outdoor tourist activities run from late February to early May and again from early October to late November, with a peak score in the last week of October.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 6.2 | 7.2 | 8.3 | 8.7 | 6.4 | 3.1 | 1.3 | 1.7 | 4.2 | 8.1 | 8.2 | 5.9 |
| Rating | good | good | ideal | ideal | good | poor | poor | poor | fair | ideal | ideal | good |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 6.2 | good |
| Feb | 7.2 | good |
| Mar | 8.3 | ideal |
| Apr | 8.7 | ideal |
| May | 6.4 | good |
| Jun | 3.1 | poor |
| Jul | 1.3 | poor |
| Aug | 1.7 | poor |
| Sep | 4.2 | fair |
| Oct | 8.1 | ideal |
| Nov | 8.2 | ideal |
| Dec | 5.9 | good |
The beach/pool score favors clear, rainless days with daytime highs between 75°F and 93°F. Based on this score, the best times of year to visit Twentynine Palms for hot-weather activities run from early April to mid June and again from mid September to late October, with a peak score in the second week of October.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Twentynine Palms, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around July (highs near 101°F), the essentials are light clothes and sun protection. In the cold season around December (highs near 59°F), pack a warm layer.
In July, Twentynine Palms sees daytime highs around 101°F and nights near 77°F. Pack light clothes and sun protection.
UV index (midday) in Twentynine Palms by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Twentynine Palms peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 8 | 9 | 11 | 11 | 11 | 8 | 6 | 4 | 3 |
| Level | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | Moderate |
| Apr | 8 | Very high |
| May | 9 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Average hourly UV index in Twentynine Palms
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in June the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 6.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 2.5 | 4.5 | 5 | 7 | 8 | 9 | 8.5 | 8 | 7 | 5.5 | 3.5 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 4 | 5 | 6.5 | 6.5 | 6 | 4 | 1 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 2.5 | 0 |
| Feb | 4.5 | 0 |
| Mar | 5 | 0 |
| Apr | 7 | 4 |
| May | 8 | 5 |
| Jun | 9 | 6.5 |
| Jul | 8.5 | 6.5 |
| Aug | 8 | 6 |
| Sep | 7 | 4 |
| Oct | 5.5 | 1 |
| Nov | 3.5 | 0 |
| Dec | 0 | 0 |
Air quality in Twentynine Palms by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Twentynine Palms is worst in September — around 20 µg/m³ PM2.5 (moderate), about 4.6× the cleanest month (December, 4 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 5 | 7 | 8 | 8 | 8 | 14 | 10 | 11 | 20 | 6 | 5 | 4 |
| Level | Good | Good | Good | Good | Good | Moderate | Good | Good | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 5 | Good |
| Feb | 7 | Good |
| Mar | 8 | Good |
| Apr | 8 | Good |
| May | 8 | Good |
| Jun | 14 | Moderate |
| Jul | 10 | Good |
| Aug | 11 | Good |
| Sep | 20 | Moderate |
| Oct | 6 | Good |
| Nov | 5 | Good |
| Dec | 4 | Good |
Growing season
Twentynine Palms is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 98 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 97 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 98 | 0 |
| Feb | 99 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 97 | 0 |
Growing degree days
Growing degree days tally heat above 50°F: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Twentynine Palms banks about 6,918 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°F·days) | 53 | 126 | 319 | 486 | 759 | 992 | 1,197 | 1,171 | 935 | 614 | 246 | 20 |
| Growing degree days (°F·days) | |
|---|---|
| Jan | 53 |
| Feb | 126 |
| Mar | 319 |
| Apr | 486 |
| May | 759 |
| Jun | 992 |
| Jul | 1,197 |
| Aug | 1,171 |
| Sep | 935 |
| Oct | 614 |
| Nov | 246 |
| Dec | 20 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Twentynine Palms receives about 6.0 kWh/m² a day of solar energy on average — intense — with a clear seasonal swing between 3.1 and 8.7 kWh/m².
The brighter stretch of the year lasts 6.4 months, from around Mar 16 to Sep 27. The brightest month is June, averaging about 8.6 kWh/m² (intense).
The dimmest month is December, down near 3.2 kWh/m² — roughly 63% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.4 | 4.5 | 6.0 | 7.5 | 8.2 | 8.6 | 8.0 | 7.3 | 6.4 | 5.1 | 3.8 | 3.2 |
| Level | Moderate | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 3.4 | Moderate |
| Feb | 4.5 | Bright |
| Mar | 6.0 | Intense |
| Apr | 7.5 | Intense |
| May | 8.2 | Intense |
| Jun | 8.6 | Intense |
| Jul | 8.0 | Intense |
| Aug | 7.3 | Intense |
| Sep | 6.4 | Intense |
| Oct | 5.1 | Bright |
| Nov | 3.8 | Moderate |
| Dec | 3.2 | Moderate |
Where is Twentynine Palms?
Twentynine Palms sits at 34.1°N, 116.1°W, 1,988 ft above sea level, in United States. The nearest listed city is Yucca Valley, 22 mi away.
Topography around Twentynine Palms
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Twentynine Palms.
Within 2 miles, the terrain around Twentynine Palms has significant variations in elevation — a maximum elevation change of 1,588 ft around an average of 2,073 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,209 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,650 ft.
The land around Twentynine Palms is covered by bare terrain (75%) and artificial surfaces (21%) within 2 miles, bare terrain (79%) within 10 miles, and bare terrain (73%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Twentynine Palms (34.1356°, -116.0542°, elevation 1,988 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).