Maxwell Creek Bridge on Hardin Road · Photo: Sanfranman59 · CC BY-SA 3.0Winter nights in Angwin are milder than in 87% of U.S. towns
Peak summer warmth arrives in July, with afternoons near 87°. The seasons are far apart: from a winter night to a summer afternoon the average spans 49°. Summer afternoons here are warmer than in 63% of U.S. towns. The heating season runs December to February: each of those months averages under 50°.
A year in Angwin at a glance
Each month’s typical high and low, and what it brings.
What stands out about Angwin’s climate
Compared with towns across the U.S., with Angwin’s place in California beside it.
What a year in Angwin feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 245 frost-free days a year
In half of years the last 32° night comes by April 7 and the first by December 5. Frost and day counts come from NOAA’s station at Angwin Pacific Union College, CA, 0.7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Angwin’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 26°. 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 40 inches of rain a year
December is the wettest month and July the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Angwin
85% of the work is heating. Months averaging under 55° run from November 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 Angwin Pacific Union College, CA.
Living with Angwin’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
245 frost-free days in zone 9b. The last frost comes by Apr 7 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 5.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 20 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Angwin from natural hazards, river flooding is the largest share (42%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Angwin and similar climates
TownRatings has no climate map of the towns around Angwin yet.
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 Angwin averaged 1.5° warmer than the 1900s. The biggest change is in January (+2.4°).
A bigger shift than in 62% 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 Angwin compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Angwin’s place among California’s.
Angwin weather by month
Highs, lows and precipitation from NOAA’s grid at Angwin’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 55° | 39° | 7.8" | 43° – 54° |
| February | 57° | 39° | 7.3" | 43° – 54° |
| March | 61° | 41° | 5.6" | 44° – 58° |
| April | 66° | 42° | 2.5" | 48° – 59° |
| May | 73° | 48° | 1.6" | 53° – 68° |
| June | 81° | 53° | 0.3" | 63° – 70° |
| July | 87° | 56° | 0.0" | 69° – 76° |
| August | 87° | 56° | 0.0" | 68° – 76° |
| September | 84° | 55° | 0.1" | 66° – 73° |
| October | 75° | 51° | 1.9" | 59° – 69° |
| November | 62° | 43° | 4.0" | 45° – 56° |
| December | 54° | 39° | 8.4" | 42° – 50° |
| Year | 70° | 47° | 39.6" |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 53° to 68°. September is the most reliable, staying within 7°.
Where Angwin’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 Angwin’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Angwin Pacific Union College, CA, 0.7 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 Angwin’s climate
What is the weather like in Angwin?
A typical July afternoon reaches 87°, a January night drops to 39°. Milder January nights than 87% of U.S. towns; hotter July afternoons than 63% of U.S. towns.
How cold does it get in Angwin in winter?
December nights average 39°. About 15 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 42°.
How hot does it get in Angwin?
July, with a typical high of 87° and a low of 56°. About 27 days a year reach 90° and 1 reach 100° (Angwin Pacific Union College, CA).
When is the first and last frost in Angwin?
In half of years the last spring frost (32°) comes by April 7 and the first fall frost by December 5, about 245 frost-free days, at Angwin Pacific Union College, CA.
What growing zone is Angwin in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 26°.
What is the best time of year to visit Angwin?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Angwin getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 62% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Angwin.
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.