Redwood Valley reaches 100° on about 17 days a year, more than 94% of U.S. towns
The depth of winter brings overnight lows near 35°. In January, nights here are milder than in 81% of U.S. towns. Decade by decade the climate has edged up, 0.8° above 1901–2000. Garden planting can start around April 8; autumn frost returns near November 6.
A year in Redwood Valley at a glance
Each month’s typical high and low, and what it brings.
What stands out about Redwood Valley’s climate
Compared with towns across the U.S., with Redwood Valley’s place in California beside it.
What a year in Redwood Valley 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 8 and the first by November 6. Frost and day counts come from NOAA’s station at Potter Valley Powerhouse, CA, 8 miles from the town’s center, 230 ft higher.
The 2023 USDA map puts Redwood Valley’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 23°. 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 3 inches of snow a winter
Snow, measured at Ukiah 4 Wsw, CA, falls mostly in February. Precipitation (rain plus melted snow) adds up to 38 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 99 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Redwood Valley
77% 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 Potter Valley Powerhouse, CA.
Living with Redwood Valley’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
211 frost-free days in zone 9a. The last frost comes by Apr 8 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 6.
Months with highs of 62–84° and lows of 40° or more: April, May, June and October. 1.6 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Redwood Valley from natural hazards, river flooding is the largest share (61%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Redwood Valley and similar climates
TownRatings has no climate map of the towns around Redwood Valley yet.
Climates most like Redwood Valley’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 |
|---|---|---|---|---|
| Redwood Valley, CA | 35° | 92° | 38" | 2.5" |
| Grants Pass, OR | 34° | 90° | 33" | 0.9" |
| Lugoff, SC | 33° | 92° | 43" | 0.4" |
| Denison, TX | 33° | 94° | 42" | 2.0" |
| Monroe, NC | 31° | 91° | 43" | 2.1" |
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 Redwood Valley averaged 0.8° warmer than the 1900s. The biggest change is in January (+1.5°).
A smaller shift than in 92% 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 Redwood Valley compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Redwood Valley’s place among California’s.
Redwood Valley weather by month
Highs, lows and precipitation from NOAA’s grid at Redwood Valley’s center; snow, wet days and snow on the ground from Ukiah 4 Wsw, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 57° | 35° | 7.5" | 0.3" | 17 | 0 | 43° – 51° |
| February | 60° | 37° | 6.7" | 1.2" | 15 | 0 | 43° – 55° |
| March | 64° | 39° | 5.6" | 0.6" | 14 | 0 | 44° – 58° |
| April | 68° | 41° | 2.7" | 0.0" | 11 | 0 | 49° – 59° |
| May | 76° | 45° | 1.5" | 0.0" | 7 | 0 | 53° – 67° |
| June | 84° | 50° | 0.4" | 0.0" | 2 | 0 | 62° – 73° |
| July | 92° | 54° | 0.0" | 0.0" | 0 | 0 | 69° – 76° |
| August | 91° | 53° | 0.1" | 0.0" | 0 | 0 | 69° – 76° |
| September | 87° | 49° | 0.2" | 0.0" | 1 | 0 | 65° – 72° |
| October | 77° | 43° | 1.9" | 0.0" | 5 | 0 | 56° – 67° |
| November | 63° | 38° | 4.1" | 0.1" | 11 | 0 | 43° – 55° |
| December | 55° | 35° | 7.7" | 0.3" | 16 | 0 | 42° – 49° |
| Year | 73° | 43° | 38.3" | 2.5" | 99 | 1 |
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 67°. August is the most reliable, staying within 7°.
Where Redwood Valley’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 Redwood Valley’s center.
- Snow: Ukiah 4 Wsw, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Potter Valley Powerhouse, CA, 8 miles from the town’s center, 230 ft higher; 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 Redwood Valley’s climate
What is the weather like in Redwood Valley?
A typical July afternoon reaches 92°, a January night drops to 35°, and about 3 inches of snow falls in a normal winter. Milder January nights than 81% of U.S. towns; hotter July afternoons than 85% of U.S. towns.
How cold does it get in Redwood Valley in winter?
December nights average 35°. About 54 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 42°.
How much snow does Redwood Valley get?
About 2.5 inches in a normal winter at Ukiah 4 Wsw, CA, most of it in February, with snow on the ground about 1 days a year.
How hot does it get in Redwood Valley?
July, with a typical high of 92° and a low of 54°. About 82 days a year reach 90° and 17 reach 100° (Potter Valley Powerhouse, CA).
When is the first and last frost in Redwood Valley?
In half of years the last spring frost (32°) comes by April 8 and the first fall frost by November 6, about 211 frost-free days, at Potter Valley Powerhouse, CA.
What growing zone is Redwood Valley in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 23°.
What is the best time of year to visit Redwood Valley?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Redwood Valley getting warmer?
Yes: 1991–2020 averaged 0.8° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 92% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Redwood Valley.
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.