July in Hornbrook runs hotter than in 91% of U.S. towns
January mornings start at about 30°. Its yearly precipitation falls short of 90% of U.S. towns. The latest 30-year average runs 1.7° warmer than 1901–2000’s, with January up the most. The outdoor season, with highs of 74–83°, runs through May and June.
A year in Hornbrook at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hornbrook’s climate
Compared with towns across the U.S., with Hornbrook’s place in California beside it.
What a year in Hornbrook feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 169 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 18. Day counts come from NOAA’s station at Montague Siskiyou Co Airport, 10 miles from the town’s center, 440 ft higher; frost dates and degree days from Yreka, CA, 15 miles away.
The 2023 USDA map puts Hornbrook’s center in zone 8a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 13°. 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 12 inches of snow a winter
Snow, measured at Yreka, CA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 19 inches a year; December is the wettest month and August the driest. Rain or snow falls on about 91 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Hornbrook
86% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Yreka, CA.
Living with Hornbrook’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
169 frost-free days in zone 8a. The last frost comes by Apr 30 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 18.
Months with highs of 62–84° and lows of 40° or more: May and June.
Parks & trails →Of the yearly building losses FEMA expects in Hornbrook from natural hazards, river flooding is the largest share (67%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Hornbrook and similar climates
TownRatings has no climate map of the towns around Hornbrook yet.
Climates most like Hornbrook’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 |
|---|---|---|---|---|
| Hornbrook, CA | 30° | 93° | 19" | 12" |
| Wolfforth, TX | 27° | 93° | 19" | 7.1" |
| Payson, AZ | 30° | 92° | 20" | 19" |
| Lewiston, ID | 30° | 92° | 14" | 13" |
| Walla Walla, WA | 30° | 91° | 16" | 9.0" |
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 Hornbrook averaged 1.7° warmer than the 1900s. The biggest change is in January (+3.1°).
A bigger shift than in 71% 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 Hornbrook compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Hornbrook’s place among California’s.
Hornbrook weather by month
Highs, lows and precipitation from NOAA’s grid at Hornbrook’s center; snow, wet days and snow on the ground from Yreka, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 49° | 30° | 3.3" | 4.3" | 13 | 2 | 34° – 44° |
| February | 53° | 31° | 2.3" | 2.6" | 10 | 1 | 36° – 48° |
| March | 59° | 33° | 2.0" | 0.4" | 11 | 0 | 40° – 52° |
| April | 65° | 36° | 1.2" | 0.2" | 9 | 0 | 46° – 56° |
| May | 74° | 43° | 1.2" | 0.0" | 8 | 0 | 51° – 66° |
| June | 83° | 48° | 0.6" | 0.0" | 4 | 0 | 61° – 73° |
| July | 93° | 54° | 0.4" | 0.0" | 3 | 0 | 65° – 78° |
| August | 92° | 53° | 0.3" | 0.0" | 2 | 0 | 68° – 77° |
| September | 85° | 46° | 0.3" | 0.0" | 2 | 0 | 62° – 70° |
| October | 71° | 39° | 1.1" | 0.0" | 5 | 0 | 51° – 60° |
| November | 55° | 33° | 2.4" | 1.5" | 11 | 1 | 36° – 50° |
| December | 47° | 29° | 3.6" | 2.6" | 13 | 1 | 34° – 42° |
| Year | 69° | 39° | 18.8" | 11.6" | 91 | 5 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 51° to 66°. September is the most reliable, staying within 8°.
Where Hornbrook’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 Hornbrook’s center.
- Snow: Yreka, CA.
- Frost dates, heating and cooling: Yreka, CA, 15 miles away.
- Freezing nights, 90° and 100° days: Montague Siskiyou Co Airport, 10 miles from the town’s center, 440 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 Hornbrook’s climate
What is the weather like in Hornbrook?
A typical July afternoon reaches 93°, a January night drops to 30°, and about 12 inches of snow falls in a normal winter. Milder January nights than 72% of U.S. towns; hotter July afternoons than 91% of U.S. towns.
How cold does it get in Hornbrook in winter?
December nights average 29°. About 137 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 34°.
How much snow does Hornbrook get?
About 12 inches in a normal winter at Yreka, CA, most of it in January, with snow on the ground about 5 days a year.
How hot does it get in Hornbrook?
July, with a typical high of 93° and a low of 54°. About 65 days a year reach 90° and 9 reach 100° (Yreka, CA).
When is the first and last frost in Hornbrook?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 18, about 169 frost-free days, at Yreka, CA.
What growing zone is Hornbrook in?
Zone 8a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 13°.
What is the best time of year to visit Hornbrook?
By one simple rule (highs of 62–84° and lows of 40° or more), May and June. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Hornbrook getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Hornbrook.
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.