Precipitation in Harbison Canyon trails that of 93% of U.S. towns: 15 inches a year
The warmest part of a July day comes in at 89° on average. Expect the heaviest rain or snow in February and the lightest in July. Its January nights stay gentler than in 90% of U.S. towns. Garden planting can start around February 12; autumn frost returns near December 24.
A year in Harbison Canyon at a glance
Each month’s typical high and low, and what it brings.
What stands out about Harbison Canyon’s climate
Compared with towns across the U.S., with Harbison Canyon’s place in California beside it.
What a year in Harbison Canyon 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 February 12 and the first by December 24. Frost and day counts come from NOAA’s station at Alpine, CA, 4 miles from the town’s center, 450 ft higher.
The 2023 USDA map puts Harbison Canyon’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 15 inches of rain a year
February is the wettest month and July the driest. Rain falls on about 38 days a year. Snow is rare: about 0.0" in a normal year at Ramona Fire Dept, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Harbison Canyon
63% of the work is heating. Months averaging under 55°: December and January.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Alpine, CA.
Living with Harbison Canyon’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
317 frost-free days in zone 10a. The last frost comes by Feb 12 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 24.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, May, June, October, November and December. 3.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Harbison Canyon from natural hazards, wildfire is the largest share (76%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Harbison Canyon and its neighbors
Alpine has the coldest January nights next door (40°, 1° colder) and Alpine the hottest July afternoons (92°, 3° 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 Harbison Canyon’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 |
|---|---|---|---|---|
| Harbison Canyon, CA | 42° | 89° | 15" | 0.0" |
| Sierra Vista Southeast, AZ | 32° | 91° | 15" | 0.7" |
| Ashland, OR | 31° | 91° | 19" | 0.5" |
| Alpine, TX | 30° | 90° | 15" | 2.2" |
| Finley, WA | 29° | 91° | 9" | 2.0" |
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 Harbison Canyon averaged 2.2° warmer than the 1900s. The biggest change is in January (+3.3°).
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 Harbison Canyon compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Harbison Canyon’s place among California’s.
Harbison Canyon weather by month
Highs, lows and precipitation from NOAA’s grid at Harbison Canyon’s center; snow, wet days and snow on the ground from Ramona Fire Dept, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 68° | 42° | 2.9" | 0.0" | 6 | 0 | 51° – 60° |
| February | 67° | 43° | 3.4" | 0.0" | 7 | 0 | 51° – 61° |
| March | 70° | 45° | 2.4" | 0.0" | 6 | 0 | 52° – 64° |
| April | 73° | 47° | 1.1" | 0.0" | 4 | 0 | 56° – 64° |
| May | 77° | 52° | 0.5" | 0.0" | 2 | 0 | 60° – 70° |
| June | 83° | 55° | 0.1" | 0.0" | 1 | 0 | 65° – 74° |
| July | 89° | 60° | 0.1" | 0.0" | 0 | 0 | 71° – 80° |
| August | 91° | 62° | 0.1" | 0.0" | 0 | 0 | 73° – 79° |
| September | 89° | 59° | 0.2" | 0.0" | 1 | 0 | 71° – 78° |
| October | 81° | 53° | 0.6" | 0.0" | 2 | 0 | 63° – 71° |
| November | 74° | 46° | 1.3" | 0.0" | 3 | 0 | 53° – 64° |
| December | 67° | 41° | 2.2" | 0.0" | 5 | 0 | 51° – 58° |
| Year | 77° | 50° | 14.7" | 0.0" | 38 | 0 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 52° to 64°. August is the most reliable, staying within 6°.
Where Harbison Canyon’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 Harbison Canyon’s center.
- Snow: Ramona Fire Dept, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Alpine, CA, 4 miles from the town’s center, 450 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 Harbison Canyon’s climate
What is the weather like in Harbison Canyon?
A typical July afternoon reaches 89°, a January night drops to 42°, and snow is almost unheard of. Milder January nights than 90% of U.S. towns; hotter July afternoons than 73% of U.S. towns.
How cold does it get in Harbison Canyon in winter?
December nights average 41°. About 3 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 51°.
How much snow does Harbison Canyon get?
About 0.0 inches in a normal winter at Ramona Fire Dept, CA, so most winters see none.
How hot does it get in Harbison Canyon?
July, with a typical high of 89° and a low of 60°. About 55 days a year reach 90° and 4 reach 100° (Alpine, CA).
When is the first and last frost in Harbison Canyon?
In half of years the last spring frost (32°) comes by February 12 and the first fall frost by December 24, about 317 frost-free days, at Alpine, CA.
What growing zone is Harbison Canyon 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 Harbison Canyon?
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 Harbison Canyon getting warmer?
Yes: 1991–2020 averaged 2.2° 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 Harbison Canyon.
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.