FROLIC (brig) · Photo: Missvain · CC BY 4.0Few U.S. towns have cooler summers than Caspar
Midwinter brings lows of about 43°. Its January nights stay gentler than in 91% of U.S. towns. Warming shows here too: 0.8° more than in 1901–2000, led by January. The frost-free window for a garden runs roughly March 2 to December 1.
A year in Caspar at a glance
Each month’s typical high and low, and what it brings.
What stands out about Caspar’s climate
Compared with towns across the U.S., with Caspar’s place in California beside it.
What a year in Caspar feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 272 frost-free days a year
In half of years the last 32° night comes by March 2 and the first by December 1. Frost and day counts come from NOAA’s station at Ft Bragg 5 N, CA, 10 miles from the town’s center, at about the same height.
The 2023 USDA map puts Caspar’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 31°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 42 inches of rain a year
December is the wettest month and July the driest. Rain falls on about 111 days a year. Snow is rare: about 0.0" in a normal year at Ft Bragg 5 N, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Caspar
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55° run from November through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Ft Bragg 5 N, CA.
Living with Caspar’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
272 frost-free days in zone 10a. The last frost comes by Mar 2 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Dec 1.
Months with highs of 62–84° and lows of 40° or more: June, July, August, September and October. 4.8 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Caspar from natural hazards, earthquakes are the largest share (67%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Caspar and similar climates
TownRatings has no climate map of the towns around Caspar yet.
Climates most like Caspar’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 |
|---|---|---|---|---|
| Caspar, CA | 43° | 65° | 42" | 0.0" |
| Port Angeles, WA | 37° | 69° | 28" | 0.4" |
| Coos Bay, OR | 40° | 66° | 61" | 0.2" |
| Makawao, HI | 53° | 75° | 23" | 0.0" |
| Nantucket, MA | 26° | 76° | 44" | 25" |
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 Caspar averaged 0.8° warmer than the 1900s. The biggest change is in January (+1.3°).
A smaller shift than in 88% 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 Caspar compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Caspar’s place among California’s.
Caspar weather by month
Highs, lows and precipitation from NOAA’s grid at Caspar’s center; snow, wet days and snow on the ground from Ft Bragg 5 N, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 55° | 43° | 7.3" | 0.0" | 16 | 0 | 45° – 53° |
| February | 56° | 43° | 6.8" | 0.0" | 14 | 0 | 45° – 55° |
| March | 57° | 44° | 6.9" | 0.0" | 15 | 0 | 46° – 54° |
| April | 58° | 45° | 3.3" | 0.0" | 11 | 0 | 48° – 55° |
| May | 60° | 47° | 1.3" | 0.0" | 7 | 0 | 49° – 58° |
| June | 63° | 49° | 0.4" | 0.0" | 3 | 0 | 53° – 59° |
| July | 65° | 51° | 0.1" | 0.0" | 2 | 0 | 55° – 60° |
| August | 65° | 52° | 0.1" | 0.0" | 3 | 0 | 56° – 62° |
| September | 65° | 50° | 0.4" | 0.0" | 4 | 0 | 55° – 61° |
| October | 63° | 48° | 2.3" | 0.0" | 7 | 0 | 53° – 63° |
| November | 59° | 45° | 4.9" | 0.0" | 13 | 0 | 46° – 56° |
| December | 55° | 42° | 8.1" | 0.0" | 17 | 0 | 46° – 53° |
| Year | 60° | 46° | 41.7" | 0.0" | 111 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 45° to 55°. July is the most reliable, staying within 5°.
Where Caspar’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 Caspar’s center.
- Snow: Ft Bragg 5 N, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Ft Bragg 5 N, CA, 10 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 Caspar’s climate
What is the weather like in Caspar?
A typical July afternoon reaches 65°, a January night drops to 43°, and snow is almost unheard of. Milder January nights than 91% of U.S. towns; cooler July afternoons than all but 20 U.S. towns.
How cold does it get in Caspar in winter?
December nights average 42°. About 12 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 46°.
How much snow does Caspar get?
About 0.0 inches in a normal winter at Ft Bragg 5 N, CA, so most winters see none.
How hot does it get in Caspar?
July, with a typical high of 65°. 90° days are rare: none in a normal year at Ft Bragg 5 N, CA.
When is the first and last frost in Caspar?
In half of years the last spring frost (32°) comes by March 2 and the first fall frost by December 1, about 272 frost-free days, at Ft Bragg 5 N, CA.
What growing zone is Caspar in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 31°.
What is the best time of year to visit Caspar?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Caspar getting warmer?
Yes: 1991–2020 averaged 0.8° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 88% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Caspar.
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.