Joshua Tree
Two deserts meet here, and elevation is the line between a cold winter night and a punishing summer one.
Joshua Tree crosses the ecological and meteorological boundary between the higher Mojave and the lower Colorado Desert. The upper country has freezing winter nights and a wider daily swing; the southeastern country shares the long, severe summer of the Salton Trough. Monsoon moisture reaches both imperfectly, producing isolated lightning, gust fronts and flash flooding rather than a dependable rainy season.
California map locating Joshua Tree National Park.
The four seasons
THE PARK CHANGES VERTICALLY, TOOWinter
Cool and often ideal by day, with freezing nights routine in the high Mojave portion.
Spring
The windiest transition, warming rapidly and drying the year's short-lived vegetation.
Summer
Dangerous heat across the park, most severe in the lower Colorado Desert; shade barely changes air temperature.
Autumn
Heat retreats by elevation, and clear dry nights restore the large desert temperature swing.
The climate transect
REFERENCE STATIONS · NOT A PARK-WIDE AVERAGEThese named gauges expose the park's temperature and precipitation gradient. They may sit outside the legal boundary; each linked place page states the exact NOAA station, its elevation and its distance. None is presented as a current park forecast.
| Atlas reference | Terrain region | Elevation | Jan low | Jul high | Annual precip | Snow |
|---|---|---|---|---|---|---|
| Barstow | Mojave Desert | 2,175 | 35° | 102° | 5.0″ | 0.3″ |
| Palm Springs | Colorado Desert & Salton Trough | 479 | 48° | 109° | 4.6″ | — |
| Blythe | Colorado Desert & Salton Trough | 268 | 40° | 110° | 3.6″ | — |
What changes the day
CLIMATE CONTEXT · NOT A LIVE WARNING FEEDHeat
The lower park enters dangerous summer heat earlier and leaves it later than the uplands.
Cold nights
High-desert winter minima surprise visitors who plan from an afternoon forecast.
Flash flood
A small monsoon cell can send water through a dry wash far from the rain shaft.