Big Creek Hydroelectric System Historic District · Photo: kallahar · CC BY 3.0Richgrove reaches 100° on about 34 days a year, more than 98% of U.S. towns
A typical July afternoon reaches 99°, a January night drops to 39°, and snow is almost unheard of.
A year in Richgrove at a glance
Each month’s typical high and low, and what it brings.
What stands out about Richgrove’s climate
Compared with towns across the U.S., with Richgrove’s place in California beside it.
What a year in Richgrove feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 309 frost-free days a year
In half of years the last 32° night comes by January 31 and the first by December 8. Frost and day counts come from NOAA’s station at Delano, CA, 9 miles from the town’s center, 210 ft lower.
The 2023 USDA map puts Richgrove’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 7 inches of rain a year
January is the wettest month and July the driest. Rain falls on about 36 days a year. Snow is rare: about 0.2" in a normal year at Delano, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Richgrove
53% of the work is heating. Months averaging under 55° run from December 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 Delano, CA.
Living with Richgrove’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
309 frost-free days in zone 9b. The last frost comes by Jan 31 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 8.
Months with highs of 62–84° and lows of 40° or more: February, March, April, October and November.
Parks & trails →Of the yearly building losses FEMA expects in Richgrove from natural hazards, earthquakes are the largest share (39%); heat waves, cold waves, winter storms and ice storms together are 21%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Richgrove and similar climates
TownRatings has no climate map of the towns around Richgrove yet.
Climates most like Richgrove’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 |
|---|---|---|---|---|
| Richgrove, CA | 39° | 99° | 7" | 0.2" |
| Three Points, AZ | 37° | 99° | 11" | 0.1" |
| Summerlin South, NV | 35° | 102° | 5" | 0.2" |
| Ivins, UT | 32° | 100° | 11" | 1.2" |
| Canutillo, TX | 32° | 96° | 9" | 0.0" |
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 Richgrove averaged 1.9° warmer than the 1900s. The biggest change is in January (+2.6°).
A bigger shift than in 86% 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 Richgrove compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Richgrove’s place among California’s.
Richgrove weather by month
Highs, lows and precipitation from NOAA’s grid at Richgrove’s center; snow, wet days and snow on the ground from Delano, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 58° | 39° | 1.4" | 0.2" | 7 | 0 | 43° – 53° |
| February | 64° | 42° | 1.3" | 0.0" | 6 | 0 | 49° – 59° |
| March | 70° | 46° | 1.3" | 0.0" | 6 | 0 | 51° – 63° |
| April | 76° | 49° | 0.7" | 0.0" | 3 | 0 | 59° – 66° |
| May | 85° | 56° | 0.3" | 0.0" | 1 | 0 | 62° – 77° |
| June | 93° | 62° | 0.1" | 0.0" | 0 | 0 | 72° – 81° |
| July | 99° | 68° | 0.0" | 0.0" | 0 | 0 | 79° – 87° |
| August | 97° | 66° | 0.0" | 0.0" | 0 | 0 | 78° – 85° |
| September | 92° | 62° | 0.0" | 0.0" | 1 | 0 | 72° – 80° |
| October | 81° | 53° | 0.4" | 0.0" | 2 | 0 | 63° – 72° |
| November | 67° | 44° | 0.7" | 0.0" | 4 | 0 | 49° – 60° |
| December | 58° | 38° | 1.2" | 0.0" | 6 | 0 | 44° – 52° |
| Year | 78° | 52° | 7.4" | 0.2" | 36 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 62° to 77°. August is the most reliable, staying within 7°.
Where Richgrove’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 Richgrove’s center.
- Snow: Delano, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Delano, CA, 9 miles from the town’s center, 210 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 Richgrove’s climate
What is the weather like in Richgrove?
A typical July afternoon reaches 99°, a January night drops to 39°, and snow is almost unheard of. Milder January nights than 87% of U.S. towns; hotter July afternoons than all but 175 U.S. towns.
How cold does it get in Richgrove in winter?
December nights average 38°. About 18 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 44°.
How much snow does Richgrove get?
About 0.2 inches in a normal winter at Delano, CA, so most winters see none.
How hot does it get in Richgrove?
July, with a typical high of 99° and a low of 68°. About 116 days a year reach 90° and 34 reach 100° (Delano, CA).
When is the first and last frost in Richgrove?
In half of years the last spring frost (32°) comes by January 31 and the first fall frost by December 8, about 309 frost-free days, at Delano, CA.
What growing zone is Richgrove 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 Richgrove?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Richgrove getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 86% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Richgrove.
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.