Richvale reaches 100° on about 19 days a year, more than 95% of U.S. towns
Midwinter brings lows of about 39°. Winter and summer sit 58° apart. By precipitation alone, it ranks drier than 89% of U.S. towns. Tender plants can go out after about January 29; in half of years the first frost comes by December 7.
A year in Richvale at a glance
Each month’s typical high and low, and what it brings.
What stands out about Richvale’s climate
Compared with towns across the U.S., with Richvale’s place in California beside it.
What a year in Richvale feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 317 frost-free days a year
In half of years the last 32° night comes by January 29 and the first by December 7. Frost and day counts come from NOAA’s station at Oroville Muni Airport, 7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Richvale’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 26°. 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 22 inches of rain a year
January is the wettest month and July the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Richvale
58% of the work is heating. Months averaging under 55° run from November through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Oroville Muni Airport.
Living with Richvale’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
317 frost-free days in zone 9b. The last frost comes by Jan 29 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 7.
Months with highs of 62–84° and lows of 40° or more: February, March, April, May, October and November.
Parks & trails →Of the yearly building losses FEMA expects in Richvale from natural hazards, drought is the largest share (83%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Richvale and similar climates
TownRatings has no climate map of the towns around Richvale yet.
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 Richvale averaged 1.2° warmer than the 1900s. The biggest change is in January (+2.6°).
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 Richvale compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Richvale’s place among California’s.
Richvale weather by month
Highs, lows and precipitation from NOAA’s grid at Richvale’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 56° | 39° | 4.1" | 44° – 53° |
| February | 62° | 41° | 4.0" | 47° – 56° |
| March | 67° | 44° | 3.0" | 50° – 61° |
| April | 74° | 47° | 1.5" | 55° – 64° |
| May | 82° | 54° | 1.1" | 60° – 75° |
| June | 90° | 59° | 0.4" | 70° – 79° |
| July | 96° | 63° | 0.0" | 75° – 83° |
| August | 95° | 61° | 0.0" | 75° – 82° |
| September | 91° | 58° | 0.2" | 71° – 78° |
| October | 80° | 50° | 1.2" | 61° – 70° |
| November | 65° | 43° | 2.2" | 48° – 60° |
| December | 56° | 38° | 3.8" | 44° – 51° |
| Year | 76° | 50° | 21.5" |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 60° to 75°. December is the most reliable, staying within 7°.
Where Richvale’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 Richvale’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Oroville Muni Airport, 7 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 Richvale’s climate
What is the weather like in Richvale?
A typical July afternoon reaches 96°, a January night drops to 39°. Milder January nights than 87% of U.S. towns; hotter July afternoons than 97% of U.S. towns.
How cold does it get in Richvale in winter?
December nights average 38°. About 11 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 44°.
How hot does it get in Richvale?
July, with a typical high of 96° and a low of 63°. About 93 days a year reach 90° and 19 reach 100° (Oroville Muni Airport).
When is the first and last frost in Richvale?
In half of years the last spring frost (32°) comes by January 29 and the first fall frost by December 7, about 317 frost-free days, at Oroville Muni Airport.
What growing zone is Richvale in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 26°.
What is the best time of year to visit Richvale?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, May, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Richvale 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 Richvale.
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.