Precipitation in Harmony Grove trails that of 95% of U.S. towns: 13 inches a year
The coldest hours of a January night bottom out at 44° on average. The wettest month is February; the driest is August. By January nights alone, it runs milder than 93% of U.S. towns. Garden chairs stay out from October to July, the months with highs of 67–84°.
A year in Harmony Grove at a glance
Each month’s typical high and low, and what it brings.
What stands out about Harmony Grove’s climate
Compared with towns across the U.S., with Harmony Grove’s place in California beside it.
What a year in Harmony Grove 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 Escondido #2, CA, 3 miles from the town’s center, 170 ft lower.
The 2023 USDA map puts Harmony Grove’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 33°. 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 13 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 Poway Valley, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Harmony Grove
44% of the work is heating, so air conditioning is the bigger bill. No month averages under 55°.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Escondido #2, CA.
Living with Harmony Grove’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 3, 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, July, October, November and December. 12 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Harmony Grove from natural hazards, river flooding is the largest share (56%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Harmony Grove and its neighbors
Escondido has the coldest January nights next door (42°, 2° colder) and Escondido the hottest July afternoons (87°, 4° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Harmony Grove’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 |
|---|---|---|---|---|
| Harmony Grove, CA | 44° | 84° | 13" | 0.0" |
| The Dalles, OR | 31° | 88° | 15" | 5.5" |
| Ewa Beach, HI | 62° | 87° | 17" | 0.0" |
| Sierra Vista Southeast, AZ | 32° | 91° | 15" | 0.7" |
| Alpine, TX | 30° | 90° | 15" | 2.2" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Harmony Grove averaged 2.1° warmer than the 1900s. The biggest change is in January (+3.2°).
A bigger shift than in 93% 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 Harmony Grove compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Harmony Grove’s place among California’s.
Harmony Grove weather by month
Highs, lows and precipitation from NOAA’s grid at Harmony Grove’s center; snow, wet days and snow on the ground from Poway Valley, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 67° | 44° | 2.6" | 0.0" | 7 | 0 | 52° – 61° |
| February | 67° | 45° | 2.9" | 0.0" | 7 | 0 | 52° – 62° |
| March | 69° | 48° | 2.2" | 0.0" | 6 | 0 | 53° – 65° |
| April | 71° | 50° | 0.9" | 0.0" | 4 | 0 | 56° – 65° |
| May | 74° | 54° | 0.3" | 0.0" | 3 | 0 | 61° – 69° |
| June | 78° | 58° | 0.1" | 0.0" | 1 | 0 | 64° – 72° |
| July | 84° | 62° | 0.1" | 0.0" | 1 | 0 | 69° – 78° |
| August | 86° | 63° | 0.0" | 0.0" | 0 | 0 | 71° – 78° |
| September | 84° | 61° | 0.1" | 0.0" | 1 | 0 | 70° – 77° |
| October | 79° | 56° | 0.6" | 0.0" | 2 | 0 | 63° – 72° |
| November | 73° | 49° | 1.1" | 0.0" | 4 | 0 | 54° – 65° |
| December | 67° | 44° | 2.0" | 0.0" | 6 | 0 | 52° – 59° |
| Year | 75° | 53° | 12.8" | 0.0" | 41 | 0 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 53° to 65°. August is the most reliable, staying within 7°.
Where Harmony Grove’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 Harmony Grove’s center.
- Snow: Poway Valley, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Escondido #2, CA, 3 miles from the town’s center, 170 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 Harmony Grove’s climate
What is the weather like in Harmony Grove?
A typical July afternoon reaches 84°, a January night drops to 44°, and snow is almost unheard of. Milder January nights than 93% of U.S. towns; cooler July afternoons than 65% of U.S. towns.
How cold does it get in Harmony Grove in winter?
December nights average 44°. About 2 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 52°.
How much snow does Harmony Grove get?
About 0.0 inches in a normal winter at Poway Valley, CA, so most winters see none.
How hot does it get in Harmony Grove?
July, with a typical high of 84° and a low of 62°. About 54 days a year reach 90° and 6 reach 100° (Escondido #2, CA).
When is the first and last frost in Harmony Grove?
Most years have no frost at all: a 32° night comes in about 39% of winters at Escondido #2, CA, usually in December or January.
What growing zone is Harmony Grove in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 33°.
What is the best time of year to visit Harmony Grove?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, May, June, July, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Harmony Grove getting warmer?
Yes: 1991–2020 averaged 2.1° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 93% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Harmony Grove.
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.