Keswick reaches 100° on about 24 days a year, more than 97% of U.S. towns
A typical July afternoon reaches 98°, a January night drops to 38°, and snow is almost unheard of.
A year in Keswick at a glance
Each month’s typical high and low, and what it brings.
What stands out about Keswick’s climate
Compared with towns across the U.S., with Keswick’s place in California beside it.
What a year in Keswick feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 24 days a year reach 100°
And 90 days reach 90°. Frost and day counts come from NOAA’s station at Shasta Dam, CA, 7 miles from the town’s center, 320 ft higher.
The 2023 USDA map puts Keswick’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 27°. 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 52 inches of rain a year
December is the wettest month and July the driest. Rain falls on about 59 days a year. Snow is rare: about 0.7" in a normal year at Redding Cdf, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Keswick
55% of the work is heating. Months averaging under 55° run from November 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 Shasta Dam, CA.
Living with Keswick’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 9b. Frost comes about 9 winters in 10, so the growing year is set by heat, not cold: 24 days at 100° make midsummer the hard season for gardens.
Months with highs of 62–84° and lows of 40° or more: March, April, May, October and November. 11 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Keswick from natural hazards, wildfire is the largest share (66%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Keswick and its neighbors
Every town next door is within a degree of Keswick in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Keswick’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 |
|---|---|---|---|---|
| Keswick, CA | 38° | 98° | 52" | 0.7" |
| Hudson, TX | 38° | 94° | 52" | 0.3" |
| Shreveport, LA | 37° | 94° | 52" | 0.1" |
| Jesup, GA | 39° | 93° | 49" | 0.0" |
| Cayce, SC | 35° | 93° | 46" | 1.2" |
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 Keswick averaged 1.3° warmer than the 1900s. The biggest change is in September (+2.3°).
A smaller shift than in 56% 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 Keswick compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Keswick’s place among California’s.
Keswick weather by month
Highs, lows and precipitation from NOAA’s grid at Keswick’s center; snow, wet days and snow on the ground from Redding Cdf, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 55° | 38° | 8.9" | 0.1" | 10 | 0 | 42° – 53° |
| February | 59° | 40° | 9.2" | 0.5" | 9 | 0 | 44° – 56° |
| March | 64° | 42° | 8.3" | 0.0" | 8 | 0 | 45° – 60° |
| April | 70° | 46° | 3.8" | 0.0" | 6 | 0 | 52° – 63° |
| May | 80° | 53° | 2.4" | 0.0" | 4 | 0 | 56° – 74° |
| June | 89° | 60° | 1.1" | 0.0" | 2 | 0 | 68° – 82° |
| July | 98° | 66° | 0.1" | 0.0" | 0 | 0 | 78° – 86° |
| August | 96° | 64° | 0.1" | 0.0" | 0 | 0 | 77° – 85° |
| September | 91° | 59° | 0.5" | 0.0" | 1 | 0 | 71° – 79° |
| October | 78° | 51° | 2.4" | 0.0" | 3 | 0 | 60° – 70° |
| November | 62° | 43° | 5.1" | 0.0" | 7 | 0 | 45° – 59° |
| December | 54° | 38° | 9.7" | 0.1" | 10 | 0 | 42° – 49° |
| Year | 75° | 50° | 51.5" | 0.7" | 59 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 56° to 74°. December is the most reliable, staying within 7°.
Where Keswick’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 Keswick’s center.
- Snow: Redding Cdf, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Shasta Dam, CA, 7 miles from the town’s center, 320 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 Keswick’s climate
What is the weather like in Keswick?
A typical July afternoon reaches 98°, a January night drops to 38°, and snow is almost unheard of. Milder January nights than 86% of U.S. towns; hotter July afternoons than 98% of U.S. towns.
How cold does it get in Keswick in winter?
December nights average 38°. About 6 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 42°.
How much snow does Keswick get?
About 0.7 inches in a normal winter at Redding Cdf, CA, so most winters see none.
How hot does it get in Keswick?
July, with a typical high of 98° and a low of 66°. About 90 days a year reach 90° and 24 reach 100° (Shasta Dam, CA).
When is the first and last frost in Keswick?
There is no reliable frost date: a 32° night comes in about 87% of winters at Shasta Dam, CA, so most years bring a freeze but some pass without one.
What growing zone is Keswick in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 27°.
What is the best time of year to visit Keswick?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April, May, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Keswick getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 56% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Keswick.
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.