For weather, Cromberg is about as ordinary as U.S. towns get
The warmest part of a July day comes in at 86° on average. Winter and summer sit 62° apart. Precipitation is light here, less than falls on 71% of U.S. towns. Comfortable outdoor weather, highs of 77–79°, belongs to June and September.
A year in Cromberg at a glance
Each month’s typical high and low, and what it brings.
What stands out about Cromberg’s climate
Compared with towns across the U.S., with Cromberg’s place in California beside it.
What a year in Cromberg feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 91 frost-free days a year
In half of years the last 32° night comes by June 11 and the first by September 10. Frost and day counts come from NOAA’s station at Portola, CA, 12 miles from the town’s center, 120 ft higher.
The 2023 USDA map puts Cromberg’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 2°. 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 38 inches of snow a winter
Snow, measured at Portola, CA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 37 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 62 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Cromberg
98% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Portola, CA.
Living with Cromberg’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
91 frost-free days in zone 7a. The last frost comes by Jun 11 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 10.
Months with highs of 62–84° and lows of 40° or more: June and September. 7.3 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Cromberg from natural hazards, wildfire is the largest share (47%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Cromberg and similar climates
TownRatings has no climate map of the towns around Cromberg yet.
Climates most like Cromberg’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 |
|---|---|---|---|---|
| Cromberg, CA | 24° | 86° | 37" | 38" |
| Cresaptown, MD | 22° | 86° | 41" | 31" |
| Bellevue, PA | 22° | 85° | 40" | 44" |
| Toledo, OH | 21° | 85° | 34" | 37" |
| Woodstock, VA | 23° | 87° | 39" | 24" |
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 Cromberg averaged 1.1° warmer than the 1900s. The biggest change is in September (+2.1°).
A smaller shift than in 68% 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 Cromberg compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Cromberg’s place among California’s.
Cromberg weather by month
Highs, lows and precipitation from NOAA’s grid at Cromberg’s center; snow, wet days and snow on the ground from Portola, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 44° | 24° | 6.6" | 11.7" | 9 | 9 | 26° – 39° |
| February | 47° | 25° | 6.1" | 7.6" | 9 | 6 | 30° – 43° |
| March | 52° | 28° | 5.5" | 6.4" | 8 | 5 | 33° – 46° |
| April | 58° | 32° | 2.9" | 1.8" | 6 | 1 | 39° – 49° |
| May | 68° | 38° | 1.9" | 0.2" | 6 | 0 | 45° – 60° |
| June | 77° | 44° | 0.7" | 0.0" | 3 | 0 | 56° – 65° |
| July | 86° | 49° | 0.2" | 0.0" | 1 | 0 | 63° – 72° |
| August | 85° | 47° | 0.2" | 0.0" | 1 | 0 | 63° – 70° |
| September | 79° | 42° | 0.5" | 0.1" | 2 | 0 | 57° – 64° |
| October | 67° | 34° | 2.1" | 0.4" | 4 | 0 | 46° – 54° |
| November | 52° | 28° | 3.8" | 2.4" | 6 | 1 | 32° – 45° |
| December | 43° | 24° | 6.8" | 7.2" | 8 | 6 | 29° – 37° |
| Year | 63° | 34° | 37.3" | 37.8" | 62 | 29 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 45° to 60°. August is the most reliable, staying within 7°.
Where Cromberg’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 Cromberg’s center.
- Snow: Portola, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Portola, CA, 12 miles from the town’s center, 120 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 Cromberg’s climate
What is the weather like in Cromberg?
A typical July afternoon reaches 86°, a January night drops to 24°, and about 38 inches of snow falls in a normal winter. Milder January nights than 59% of U.S. towns; hotter July afternoons than 55% of U.S. towns.
How cold does it get in Cromberg in winter?
December nights average 24°. About 205 nights a year reach 32° or below and 2 reach 0° or below. In the coldest December of the last 30 years the month averaged 29°.
How much snow does Cromberg get?
About 38 inches in a normal winter at Portola, CA, most of it in January, with snow on the ground about 29 days a year.
How hot does it get in Cromberg?
July, with a typical high of 86° and a low of 49°. About 22 days a year reach 90° (Portola, CA).
When is the first and last frost in Cromberg?
In half of years the last spring frost (32°) comes by June 11 and the first fall frost by September 10, about 91 frost-free days, at Portola, CA.
What growing zone is Cromberg in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 2°.
What is the best time of year to visit Cromberg?
By one simple rule (highs of 62–84° and lows of 40° or more), June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Cromberg getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 68% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Cromberg.
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.