Oak Grove Butterfield Stage Station · Photo: Jack Boucher · Public domainAguanga reaches 100° on about 14 days a year, more than 93% of U.S. towns
Midwinter brings lows of about 36°. It is a dry place: less rain and snow fall here than on 93% of U.S. towns. Warming shows here too: 2.1° more than in 1901–2000, led by January. Garden planting can start around April 18; autumn frost returns near October 26.
A year in Aguanga at a glance
Each month’s typical high and low, and what it brings.
What stands out about Aguanga’s climate
Compared with towns across the U.S., with Aguanga’s place in California beside it.
What a year in Aguanga feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 189 frost-free days a year
In half of years the last 32° night comes by April 18 and the first by October 26. Frost and day counts come from NOAA’s station at Henshaw Dam, CA, 16 miles from the town’s center, 420 ft higher.
The 2023 USDA map puts Aguanga’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 15 inches of rain a year
February is the wettest month and June the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Aguanga
82% of the work is heating. Months averaging under 55° run from December through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Henshaw Dam, CA.
Living with Aguanga’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
189 frost-free days in zone 9b. The last frost comes by Apr 18 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 26.
Months with highs of 62–84° and lows of 40° or more: April, May and October. 18 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Aguanga from natural hazards, wildfire is the largest share (75%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Aguanga and similar climates
TownRatings has no climate map of the towns around Aguanga 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 Aguanga averaged 2.1° warmer than the 1900s. The biggest change is in January (+3.1°).
A bigger shift than in 94% 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 Aguanga compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Aguanga’s place among California’s.
Aguanga weather by month
Highs, lows and precipitation from NOAA’s grid at Aguanga’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 64° | 36° | 3.1" | 45° – 57° |
| February | 65° | 36° | 3.7" | 44° – 59° |
| March | 68° | 40° | 2.3" | 46° – 61° |
| April | 73° | 42° | 1.0" | 51° – 61° |
| May | 79° | 46° | 0.4" | 56° – 70° |
| June | 88° | 51° | 0.1" | 63° – 75° |
| July | 95° | 58° | 0.1" | 71° – 81° |
| August | 96° | 59° | 0.2" | 74° – 81° |
| September | 90° | 54° | 0.3" | 68° – 77° |
| October | 81° | 46° | 0.5" | 59° – 70° |
| November | 71° | 39° | 1.0" | 46° – 61° |
| December | 64° | 34° | 2.2" | 43° – 56° |
| Year | 78° | 45° | 15.0" |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 44° to 59°. August is the most reliable, staying within 7°.
Where Aguanga’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 Aguanga’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Henshaw Dam, CA, 16 miles from the town’s center, 420 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 Aguanga’s climate
What is the weather like in Aguanga?
A typical July afternoon reaches 95°, a January night drops to 36°. Milder January nights than 83% of U.S. towns; hotter July afternoons than 94% of U.S. towns.
How cold does it get in Aguanga in winter?
December nights average 34°. About 105 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 43°.
How hot does it get in Aguanga?
July, with a typical high of 95° and a low of 58°. About 88 days a year reach 90° and 14 reach 100° (Henshaw Dam, CA).
When is the first and last frost in Aguanga?
In half of years the last spring frost (32°) comes by April 18 and the first fall frost by October 26, about 189 frost-free days, at Henshaw Dam, CA.
What growing zone is Aguanga 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 Aguanga?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Aguanga getting warmer?
Yes: 1991–2020 averaged 2.1° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 94% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Aguanga.
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.