Photo: Amin Eshaiker · CC BY-SA 3.0Barstow reaches 100° on about 68 days a year, more than all but 114 U.S. towns
A typical July afternoon reaches 101°, a January night drops to 37°, and snow is almost unheard of.
A year in Barstow at a glance
Each month’s typical high and low, and what it brings.
What stands out about Barstow’s climate
Compared with towns across the U.S., with Barstow’s place in California beside it.
What a year in Barstow feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 271 frost-free days a year
In half of years the last 32° night comes by February 22 and the first by November 23. Frost and day counts come from NOAA’s station at Barstow, CA, 1.9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Barstow’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 21°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 5 inches of rain a year
February is the wettest month and June the driest. Rain falls on about 22 days a year. Snow is rare: about 0.3" in a normal year at Barstow, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Barstow
47% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Barstow, CA.
Living with Barstow’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
271 frost-free days in zone 9a. The last frost comes by Feb 22 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 23.
Months with highs of 62–84° and lows of 40° or more: March, April, October and November. 62 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Barstow from natural hazards, earthquakes are the largest share (55%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Barstow and similar climates
TownRatings has no climate map of the towns around Barstow yet.
Climates most like Barstow’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Barstow, CA | 37° | 101° | 5" | 0.3" |
| Golden Valley, AZ | 38° | 101° | 9" | 0.0" |
| St. George, UT | 33° | 103° | 8" | 1.2" |
| Monahans, TX | 30° | 98° | 12" | 0.7" |
| Sunland Park, NM | 32° | 96° | 9" | 2.0" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Barstow averaged 2.1° warmer than the 1900s. The biggest change is in September (+3.0°).
A bigger shift than in 93% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Barstow compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Barstow’s place among California’s.
Barstow weather by month
Highs, lows and precipitation from NOAA’s grid at Barstow’s center; snow, wet days and snow on the ground from Barstow, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 59° | 37° | 0.8" | 0.0" | 4 | 0 | 43° – 54° |
| February | 63° | 39° | 1.0" | 0.0" | 4 | 0 | 45° – 58° |
| March | 69° | 44° | 0.7" | 0.0" | 3 | 0 | 50° – 62° |
| April | 76° | 49° | 0.3" | 0.0" | 1 | 0 | 57° – 66° |
| May | 85° | 56° | 0.1" | 0.0" | 1 | 0 | 62° – 78° |
| June | 95° | 64° | 0.0" | 0.0" | 0 | 0 | 73° – 85° |
| July | 101° | 71° | 0.2" | 0.0" | 2 | 0 | 81° – 90° |
| August | 100° | 70° | 0.1" | 0.0" | 1 | 0 | 81° – 89° |
| September | 93° | 64° | 0.2" | 0.0" | 1 | 0 | 74° – 82° |
| October | 80° | 53° | 0.3" | 0.0" | 1 | 0 | 63° – 73° |
| November | 68° | 43° | 0.3" | 0.0" | 2 | 0 | 47° – 62° |
| December | 58° | 36° | 0.8" | 0.3" | 3 | 0 | 44° – 51° |
| Year | 79° | 52° | 4.9" | 0.3" | 22 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 62° to 78°. December is the most reliable, staying within 7°.
Where Barstow’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Barstow’s center.
- Snow: Barstow, CA (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Barstow, CA, 1.9 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Barstow’s climate
What is the weather like in Barstow?
A typical July afternoon reaches 101°, a January night drops to 37°, and snow is almost unheard of. Milder January nights than 84% of U.S. towns; hotter July afternoons than all but 111 U.S. towns.
How cold does it get in Barstow in winter?
December nights average 36°. About 32 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 44°.
How much snow does Barstow get?
About 0.3 inches in a normal winter at Barstow, CA, so most winters see none.
How hot does it get in Barstow?
July, with a typical high of 101° and a low of 71°. About 133 days a year reach 90° and 68 reach 100° (Barstow, CA).
When is the first and last frost in Barstow?
In half of years the last spring frost (32°) comes by February 22 and the first fall frost by November 23, about 271 frost-free days, at Barstow, CA.
What growing zone is Barstow in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 21°.
What is the best time of year to visit Barstow?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Barstow getting warmer?
Yes: 1991–2020 averaged 2.1° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 93% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Barstow.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.