Photo: SkiDragon · CC BY-SA 3.0Rosamond reaches 100° on about 36 days a year, more than 98% of U.S. towns
A typical July afternoon reaches 98°, a January night drops to 33°, and about 1 inches of snow falls in a normal winter.
A year in Rosamond at a glance
Each month’s typical high and low, and what it brings.
What stands out about Rosamond’s climate
Compared with towns across the U.S., with Rosamond’s place in California beside it.
What a year in Rosamond feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 211 frost-free days a year
In half of years the last 32° night comes by April 3 and the first by November 1. Frost and day counts come from NOAA’s station at Lancaster Wm J Fox Fld, CA, 9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Rosamond’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 17°. 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 1 inches of snow a winter
Snow, measured at Mojave, CA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 8 inches a year; February is the wettest month and June the driest. Rain or snow falls on about 20 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Rosamond
61% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Lancaster Wm J Fox Fld, CA.
Living with Rosamond’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
211 frost-free days in zone 8b. The last frost comes by Apr 3 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 1.
Months with highs of 62–84° and lows of 40° or more: March, April, May and October. 198 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Rosamond from natural hazards, river flooding is the largest share (64%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Rosamond and similar climates
TownRatings has no climate map of the towns around Rosamond yet.
Climates most like Rosamond’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 |
|---|---|---|---|---|
| Rosamond, CA | 33° | 98° | 8" | 1.2" |
| San Elizario, TX | 31° | 97° | 9" | 1.7" |
| Sunland Park, NM | 32° | 96° | 9" | 2.0" |
| Thatcher, AZ | 31° | 99° | 9" | 0.2" |
| Ivins, UT | 32° | 100° | 11" | 1.2" |
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 Rosamond averaged 1.9° warmer than the 1900s. The biggest change is in March (+2.6°).
A bigger shift than in 87% 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 Rosamond compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Rosamond’s place among California’s.
Rosamond weather by month
Highs, lows and precipitation from NOAA’s grid at Rosamond’s center; snow, wet days and snow on the ground from Mojave, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 59° | 33° | 1.7" | 0.5" | 4 | 0 | 42° – 51° |
| February | 62° | 36° | 2.1" | 0.1" | 4 | 0 | 43° – 56° |
| March | 67° | 40° | 1.2" | 0.2" | 3 | 0 | 47° – 60° |
| April | 73° | 45° | 0.4" | 0.0" | 2 | 0 | 52° – 64° |
| May | 81° | 53° | 0.1" | 0.0" | 1 | 0 | 57° – 75° |
| June | 91° | 61° | 0.0" | 0.0" | 0 | 0 | 69° – 82° |
| July | 98° | 67° | 0.1" | 0.0" | 0 | 0 | 77° – 87° |
| August | 98° | 65° | 0.1" | 0.0" | 0 | 0 | 78° – 85° |
| September | 91° | 58° | 0.2" | 0.0" | 0 | 0 | 69° – 79° |
| October | 80° | 48° | 0.4" | 0.0" | 1 | 0 | 60° – 70° |
| November | 67° | 38° | 0.5" | 0.0" | 2 | 0 | 45° – 58° |
| December | 57° | 32° | 1.2" | 0.4" | 3 | 0 | 40° – 48° |
| Year | 77° | 48° | 7.7" | 1.2" | 20 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 57° to 75°. December is the most reliable, staying within 7°.
Where Rosamond’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 Rosamond’s center.
- Snow: Mojave, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Lancaster Wm J Fox Fld, CA, 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 Rosamond’s climate
What is the weather like in Rosamond?
A typical July afternoon reaches 98°, a January night drops to 33°, and about 1 inches of snow falls in a normal winter. Milder January nights than 77% of U.S. towns; hotter July afternoons than 98% of U.S. towns.
How cold does it get in Rosamond in winter?
December nights average 32°. About 68 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 40°.
How much snow does Rosamond get?
About 1.2 inches in a normal winter at Mojave, CA, most of it in January, with snow on the ground about 0 days a year.
How hot does it get in Rosamond?
July, with a typical high of 98° and a low of 67°. About 109 days a year reach 90° and 36 reach 100° (Lancaster Wm J Fox Fld, CA).
When is the first and last frost in Rosamond?
In half of years the last spring frost (32°) comes by April 3 and the first fall frost by November 1, about 211 frost-free days, at Lancaster Wm J Fox Fld, CA.
What growing zone is Rosamond in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 17°.
What is the best time of year to visit Rosamond?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April, May and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Rosamond getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 87% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Rosamond.
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.