Rainbow is drier than 94% of U.S. towns: 14 inches of precipitation a year
Expect July afternoons of about 89°. A year here swings 49° from midwinter lows to midsummer highs. In January, nights here are milder than in 93% of U.S. towns. From October to June, highs of 66–83° make it easy to spend the day outdoors.
A year in Rainbow at a glance
Each month’s typical high and low, and what it brings.
What stands out about Rainbow’s climate
Compared with towns across the U.S., with Rainbow’s place in California beside it.
What a year in Rainbow feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Frost is rare
Frost and day counts come from NOAA’s station at Fallbrook 5 Ne, CA, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Rainbow’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 35°. Plant labels use the zone; frost dates tell you when to plant.
90° days by month
Average days at 90° or more
About 14 inches of rain a year
February is the wettest month and August the driest. Rain falls on about 41 days a year. Snow is rare: about 0.0" in a normal year at Escondido #2, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Rainbow
49% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from December.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Fallbrook 5 Ne, CA.
Living with Rainbow’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10a. Frost comes about 1 winter in 6, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, May, June, October, November and December. 3.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Rainbow from natural hazards, wildfire is the largest share (80%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Rainbow and similar climates
TownRatings has no climate map of the towns around Rainbow yet.
Climates most like Rainbow’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 |
|---|---|---|---|---|
| Rainbow, CA | 44° | 89° | 14" | 0.0" |
| Sierra Vista Southeast, AZ | 32° | 91° | 15" | 0.7" |
| Port Isabel, TX | 52° | 92° | 26" | 0.2" |
| Ashland, OR | 31° | 91° | 19" | 0.5" |
| Finley, WA | 29° | 91° | 9" | 2.0" |
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 Rainbow averaged 2.0° warmer than the 1900s. The biggest change is in January (+3.1°).
A bigger shift than in 91% 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 Rainbow compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Rainbow’s place among California’s.
Rainbow weather by month
Highs, lows and precipitation from NOAA’s grid at Rainbow’s center; snow, wet days and snow on the ground from Escondido #2, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 67° | 44° | 3.0" | 0.0" | 6 | 0 | 52° – 61° |
| February | 67° | 44° | 3.5" | 0.0" | 7 | 0 | 50° – 63° |
| March | 69° | 47° | 2.2" | 0.0" | 6 | 0 | 52° – 65° |
| April | 73° | 49° | 1.0" | 0.0" | 4 | 0 | 56° – 65° |
| May | 77° | 53° | 0.4" | 0.0" | 3 | 0 | 60° – 71° |
| June | 83° | 57° | 0.1" | 0.0" | 1 | 0 | 66° – 74° |
| July | 89° | 62° | 0.1" | 0.0" | 1 | 0 | 72° – 81° |
| August | 91° | 63° | 0.1" | 0.0" | 0 | 0 | 74° – 81° |
| September | 88° | 61° | 0.1" | 0.0" | 1 | 0 | 71° – 79° |
| October | 81° | 55° | 0.6" | 0.0" | 2 | 0 | 63° – 72° |
| November | 73° | 48° | 1.0" | 0.0" | 4 | 0 | 54° – 65° |
| December | 66° | 43° | 2.1" | 0.0" | 6 | 0 | 51° – 61° |
| Year | 77° | 52° | 14.1" | 0.0" | 41 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 50° to 63°. August is the most reliable, staying within 6°.
Where Rainbow’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 Rainbow’s center.
- Snow: Escondido #2, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Fallbrook 5 Ne, CA, 4 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 Rainbow’s climate
What is the weather like in Rainbow?
A typical July afternoon reaches 89°, a January night drops to 44°, and snow is almost unheard of. Milder January nights than 93% of U.S. towns; hotter July afternoons than 73% of U.S. towns.
How cold does it get in Rainbow in winter?
December nights average 43°. A night at 32° or below comes in only some winters (0.2 a year on average). In the coldest December of the last 30 years the month averaged 51°.
How much snow does Rainbow get?
About 0.0 inches in a normal winter at Escondido #2, CA, so most winters see none.
How hot does it get in Rainbow?
July, with a typical high of 89° and a low of 62°. About 60 days a year reach 90° and 9 reach 100° (Fallbrook 5 Ne, CA).
When is the first and last frost in Rainbow?
Most years have no frost at all: a 32° night comes in about 17% of winters at Fallbrook 5 Ne, CA, usually in December or January.
What growing zone is Rainbow in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 35°.
What is the best time of year to visit Rainbow?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, May, June, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Rainbow getting warmer?
Yes: 1991–2020 averaged 2.0° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 91% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Rainbow.
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.