Photo: Bobak Ha'Eri · CC BY 3.0July in Coulterville runs hotter than in 91% of U.S. towns
January mornings start at about 35°. The gap between a January night and a July afternoon is 59°. Its yearly precipitation falls short of 86% of U.S. towns. Plan time outside for April, May and October, when highs sit at 66–75°.
A year in Coulterville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Coulterville’s climate
Compared with towns across the U.S., with Coulterville’s place in California beside it.
What a year in Coulterville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 213 frost-free days a year
In half of years the last 32° night comes by April 9 and the first by November 9. Frost and day counts come from NOAA’s station at Sonora, CA, 20 miles from the town’s center, 220 ft lower.
The 2023 USDA map puts Coulterville’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 22°. 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 8 inches of snow a winter
Snow, measured at Groveland Rs, CA, falls mostly in January, March and December. Precipitation (rain plus melted snow) adds up to 30 inches a year; January is the wettest month and July the driest. Rain or snow falls on about 60 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Coulterville
79% of the work is heating. Months averaging under 55° run from November through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Sonora, CA.
Living with Coulterville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
213 frost-free days in zone 9a. The last frost comes by Apr 9 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 9.
Months with highs of 62–84° and lows of 40° or more: April, May and October.
Parks & trails →Of the yearly building losses FEMA expects in Coulterville from natural hazards, wildfire is the largest share (52%); heat waves, cold waves, winter storms and ice storms together are 24%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Coulterville and similar climates
TownRatings has no climate map of the towns around Coulterville yet.
Climates most like Coulterville’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 |
|---|---|---|---|---|
| Coulterville, CA | 35° | 93° | 30" | 8.2" |
| Abilene, TX | 32° | 96° | 26" | 3.7" |
| Eagle Point, OR | 32° | 92° | 23" | 3.4" |
| Newcastle, OK | 28° | 94° | 36" | 6.7" |
| Payson, AZ | 30° | 92° | 20" | 19" |
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 Coulterville averaged 1.1° warmer than the 1900s. The biggest change is in January (+2.2°).
A smaller shift than in 70% 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 Coulterville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Coulterville’s place among California’s.
Coulterville weather by month
Highs, lows and precipitation from NOAA’s grid at Coulterville’s center; snow, wet days and snow on the ground from Groveland Rs, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 55° | 35° | 5.7" | 1.8" | 9 | 42° – 51° |
| February | 57° | 37° | 5.0" | 1.6" | 9 | 40° – 53° |
| March | 61° | 39° | 5.0" | 1.7" | 8 | 42° – 57° |
| April | 66° | 41° | 2.6" | 0.5" | 6 | 48° – 58° |
| May | 75° | 47° | 1.3" | 0.0" | 5 | 53° – 69° |
| June | 86° | 54° | 0.3" | 0.0" | 2 | 63° – 75° |
| July | 93° | 60° | 0.0" | 0.0" | 1 | 72° – 80° |
| August | 92° | 59° | 0.0" | 0.0" | 1 | 72° – 79° |
| September | 87° | 55° | 0.2" | 0.0" | 1 | 67° – 75° |
| October | 75° | 47° | 1.5" | 0.0" | 4 | 57° – 68° |
| November | 63° | 39° | 2.9" | 0.9" | 7 | 42° – 57° |
| December | 54° | 34° | 5.4" | 1.7" | 9 | 40° – 50° |
| Year | 72° | 45° | 29.9" | 8.2" | 60 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 53° to 69°. August is the most reliable, staying within 8°.
Where Coulterville’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 Coulterville’s center.
- Snow: Groveland Rs, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Sonora, CA, 20 miles from the town’s center, 220 ft lower; 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 Coulterville’s climate
What is the weather like in Coulterville?
A typical July afternoon reaches 93°, a January night drops to 35°, and about 8 inches of snow falls in a normal winter. Milder January nights than 79% of U.S. towns; hotter July afternoons than 91% of U.S. towns.
How cold does it get in Coulterville in winter?
December nights average 34°. About 66 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 40°.
How much snow does Coulterville get?
About 8.2 inches in a normal winter at Groveland Rs, CA, most of it in January, March and December.
How hot does it get in Coulterville?
July, with a typical high of 93° and a low of 60°. About 75 days a year reach 90° and 9 reach 100° (Sonora, CA).
When is the first and last frost in Coulterville?
In half of years the last spring frost (32°) comes by April 9 and the first fall frost by November 9, about 213 frost-free days, at Sonora, CA.
What growing zone is Coulterville in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 22°.
What is the best time of year to visit Coulterville?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Coulterville getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 70% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Coulterville.
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.