Hilmar-Irwin reaches 100° on about 12 days a year, more than 92% of U.S. towns
The coldest hours of a January night bottom out at 39° on average. It is a dry place: less rain and snow fall here than on 96% of U.S. towns. Compared with 1901–2000, the average now sits 1.6° higher. Homes need heating from December to January, the months averaging under 50°.
A year in Hilmar-Irwin at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hilmar-Irwin’s climate
Compared with towns across the U.S., with Hilmar-Irwin’s place in California beside it.
What a year in Hilmar-Irwin feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 12 days a year reach 100°
And 80 days reach 90°. Frost and day counts come from NOAA’s station at Turlock #2, CA, 7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Hilmar-Irwin’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 25°. 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 rain a year
January is the wettest month and July the driest. Rain falls on about 57 days a year. Snow is rare: about 0.0" in a normal year at Turlock #2, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Hilmar-Irwin
54% of the work is heating. Months averaging under 55° run from November through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Turlock #2, CA.
Living with Hilmar-Irwin’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 9b. Frost comes about 7 winters in 10, so the growing year is set by heat, not cold: 12 days at 100° make midsummer the hard season for gardens.
Months with highs of 62–84° and lows of 40° or more: February, March, April, May, October and November.
Parks & trails →Of the yearly building losses FEMA expects in Hilmar-Irwin from natural hazards, earthquakes are the largest share (58%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Hilmar-Irwin and similar climates
TownRatings has no climate map of the towns around Hilmar-Irwin yet.
Climates most like Hilmar-Irwin’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 |
|---|---|---|---|---|
| Hilmar-Irwin, CA | 39° | 95° | 12" | 0.0" |
| Corona de Tucson, AZ | 36° | 96° | 14" | 0.1" |
| Fort Stockton, TX | 33° | 96° | 13" | 1.4" |
| Anthony, NM | 31° | 96° | 9" | 0.0" |
| Ivins, UT | 32° | 100° | 11" | 1.2" |
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 Hilmar-Irwin averaged 1.6° warmer than the 1900s. The biggest change is in January (+2.3°).
A bigger shift than in 64% 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 Hilmar-Irwin compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Hilmar-Irwin’s place among California’s.
Hilmar-Irwin weather by month
Highs, lows and precipitation from NOAA’s grid at Hilmar-Irwin’s center; snow, wet days and snow on the ground from Turlock #2, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 56° | 39° | 2.5" | 0.0" | 10 | 0 | 43° – 52° |
| February | 62° | 42° | 2.2" | 0.0" | 10 | 0 | 48° – 55° |
| March | 68° | 45° | 1.9" | 0.0" | 9 | 0 | 50° – 62° |
| April | 74° | 48° | 0.9" | 0.0" | 5 | 0 | 56° – 65° |
| May | 82° | 53° | 0.5" | 0.0" | 3 | 0 | 61° – 74° |
| June | 90° | 59° | 0.1" | 0.0" | 1 | 0 | 70° – 77° |
| July | 95° | 63° | 0.0" | 0.0" | 0 | 0 | 75° – 83° |
| August | 94° | 62° | 0.0" | 0.0" | 0 | 0 | 74° – 81° |
| September | 90° | 59° | 0.0" | 0.0" | 1 | 0 | 71° – 77° |
| October | 80° | 51° | 0.6" | 0.0" | 3 | 0 | 62° – 70° |
| November | 66° | 43° | 1.0" | 0.0" | 6 | 0 | 48° – 59° |
| December | 56° | 39° | 2.1" | 0.0" | 10 | 0 | 43° – 52° |
| Year | 76° | 50° | 11.9" | 0.0" | 57 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 61° to 74°. September is the most reliable, staying within 6°.
Where Hilmar-Irwin’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 Hilmar-Irwin’s center.
- Snow: Turlock #2, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Turlock #2, CA, 7 miles from the town’s center, at about the same height; 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 Hilmar-Irwin’s climate
What is the weather like in Hilmar-Irwin?
A typical July afternoon reaches 95°, a January night drops to 39°, and snow is almost unheard of. Milder January nights than 87% of U.S. towns; hotter July afternoons than 95% of U.S. towns.
How cold does it get in Hilmar-Irwin in winter?
December nights average 39°. About 7 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 43°.
How much snow does Hilmar-Irwin get?
About 0.0 inches in a normal winter at Turlock #2, CA, so most winters see none.
How hot does it get in Hilmar-Irwin?
July, with a typical high of 95° and a low of 63°. About 80 days a year reach 90° and 12 reach 100° (Turlock #2, CA).
When is the first and last frost in Hilmar-Irwin?
There is no reliable frost date: a 32° night comes in about 68% of winters at Turlock #2, CA, so most years bring a freeze but some pass without one.
What growing zone is Hilmar-Irwin in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 25°.
What is the best time of year to visit Hilmar-Irwin?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, May, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Hilmar-Irwin getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 64% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Hilmar-Irwin.
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.