The climate in Johnsville sits close to the middle of U.S. towns
High summer brings afternoon highs near 84°. Its January nights stay gentler than in 63% of U.S. towns. Warming shows here too: 1.2° more than in 1901–2000, led by September. Plan time outside for June, August and September, when highs sit at 75–83°.
A year in Johnsville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Johnsville’s climate
Compared with towns across the U.S., with Johnsville’s place in California beside it.
What a year in Johnsville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 167 frost-free days a year
In half of years the last 32° night comes by May 12 and the first by October 29. Frost and day counts come from NOAA’s station at Bowman Dam, CA, 22 miles from the town’s center, 190 ft lower.
The 2023 USDA map puts Johnsville’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 4°. 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 28 inches of snow a winter
Snow, measured at Quincy, CA, falls mostly in February. Precipitation (rain plus melted snow) adds up to 44 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 84 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Johnsville
94% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October 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 Bowman Dam, CA.
Living with Johnsville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
167 frost-free days in zone 7a. The last frost comes by May 12 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 29.
Months with highs of 62–84° and lows of 40° or more: June, August and September. 17 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Johnsville from natural hazards, river flooding is the largest share (58%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Johnsville and its neighbors
Plumas Eureka has the coldest January nights next door (24°, 1° colder) and Graeagle the hottest July afternoons (87°, 3° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Johnsville’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 |
|---|---|---|---|---|
| Johnsville, CA | 25° | 84° | 44" | 28" |
| West Babylon, NY | 25° | 84° | 44" | 32" |
| Blacksburg, VA | 25° | 84° | 43" | 25" |
| Damascus, MD | 25° | 85° | 45" | 31" |
| Fairmont, WV | 23° | 84° | 46" | 24" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Johnsville averaged 1.2° warmer than the 1900s. The biggest change is in September (+2.2°).
A smaller shift than in 60% 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 Johnsville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Johnsville’s place among California’s.
Johnsville weather by month
Highs, lows and precipitation from NOAA’s grid at Johnsville’s center; snow, wet days and snow on the ground from Quincy, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 44° | 25° | 7.8" | 5.8" | 12 | 3 | 27° – 40° |
| February | 46° | 26° | 7.3" | 7.6" | 11 | 2 | 29° – 44° |
| March | 51° | 29° | 6.4" | 5.4" | 13 | 1 | 32° – 46° |
| April | 57° | 32° | 3.6" | 1.6" | 9 | 0 | 38° – 49° |
| May | 66° | 39° | 2.3" | 0.0" | 7 | 0 | 43° – 59° |
| June | 75° | 45° | 0.8" | 0.0" | 3 | 0 | 55° – 65° |
| July | 84° | 50° | 0.2" | 0.0" | 1 | 0 | 63° – 72° |
| August | 83° | 49° | 0.2" | 0.0" | 1 | 0 | 63° – 70° |
| September | 77° | 43° | 0.6" | 0.0" | 2 | 0 | 57° – 64° |
| October | 65° | 36° | 2.6" | 0.1" | 5 | 0 | 47° – 55° |
| November | 51° | 29° | 4.6" | 1.7" | 8 | 0 | 31° – 45° |
| December | 42° | 25° | 8.0" | 6.2" | 12 | 1 | 29° – 38° |
| Year | 62° | 36° | 44.2" | 28.4" | 84 | 7 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 43° to 59°. September is the most reliable, staying within 7°.
Where Johnsville’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 Johnsville’s center.
- Snow: Quincy, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Bowman Dam, CA, 22 miles from the town’s center, 190 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 Johnsville’s climate
What is the weather like in Johnsville?
A typical July afternoon reaches 84°, a January night drops to 25°, and about 28 inches of snow falls in a normal winter. Milder January nights than 63% of U.S. towns; cooler July afternoons than 59% of U.S. towns.
How cold does it get in Johnsville in winter?
December nights average 25°. About 127 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 29°.
How much snow does Johnsville get?
About 28 inches in a normal winter at Quincy, CA, most of it in February, with snow on the ground about 7 days a year.
How hot does it get in Johnsville?
July, with a typical high of 84° and a low of 50°. About 9 days a year reach 90° (Bowman Dam, CA).
When is the first and last frost in Johnsville?
In half of years the last spring frost (32°) comes by May 12 and the first fall frost by October 29, about 167 frost-free days, at Bowman Dam, CA.
What growing zone is Johnsville in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 4°.
What is the best time of year to visit Johnsville?
By one simple rule (highs of 62–84° and lows of 40° or more), June, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Johnsville getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 60% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Johnsville.
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.