Photo: Scottthezombie (Transferred by JaumeBG/Originally uploaded by Scottthezombie) · CC BY-SA 3.0Dry weather: only 23 inches of rain and melted snow a year in Crestline, less than in 88% of U.S. towns
The coldest hours of a January night bottom out at 36° on average. Winter and summer sit 52° apart. Winters are mild: January nights here are milder than in 82% of U.S. towns. For walks and days out, the stretch from April to June and September to October brings highs of 65–82°.
A year in Crestline at a glance
Each month’s typical high and low, and what it brings.
What stands out about Crestline’s climate
Compared with towns across the U.S., with Crestline’s place in California beside it.
What a year in Crestline feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 176 frost-free days a year
In half of years the last 32° night comes by May 5 and the first by November 2. Frost and day counts come from Lake Arrowhead, CA, 5 miles away.
The 2023 USDA map puts Crestline’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 21°. 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 23 inches of rain a year
February is the wettest month and June the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Crestline
93% of the work is heating, so the furnace matters far more than the air conditioner. 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 Lake Arrowhead, CA.
Living with Crestline’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
176 frost-free days in zone 9a. The last frost comes by May 5 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 2.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 13 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Crestline from natural hazards, wildfire is the largest share (46%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Crestline and similar climates
TownRatings has no climate map of the towns around Crestline 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 Crestline averaged 2.0° warmer than the 1900s. The biggest change is in January (+2.8°).
A bigger shift than in 89% 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 Crestline compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Crestline’s place among California’s.
Crestline weather by month
Highs, lows and precipitation from NOAA’s grid at Crestline’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 53° | 36° | 4.9" | 40° – 51° |
| February | 54° | 36° | 5.5" | 38° – 53° |
| March | 60° | 38° | 3.4" | 41° – 56° |
| April | 65° | 41° | 1.6" | 47° – 58° |
| May | 72° | 47° | 0.5" | 52° – 67° |
| June | 82° | 55° | 0.1" | 63° – 73° |
| July | 87° | 62° | 0.2" | 70° – 79° |
| August | 87° | 62° | 0.1" | 72° – 78° |
| September | 82° | 58° | 0.2" | 66° – 74° |
| October | 72° | 49° | 0.9" | 56° – 66° |
| November | 61° | 41° | 1.4" | 43° – 56° |
| December | 53° | 36° | 3.8" | 40° – 49° |
| Year | 69° | 47° | 22.6" |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 41° to 56°. August is the most reliable, staying within 7°.
Where Crestline’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 Crestline’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Lake Arrowhead, CA, 5 miles from the town’s center, 510 ft higher; no station nearby passes every check; this is the nearest one in the same valley, flagged above.
- 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 Crestline’s climate
What is the weather like in Crestline?
A typical July afternoon reaches 87°, a January night drops to 36°. Milder January nights than 82% of U.S. towns; hotter July afternoons than 63% of U.S. towns.
How cold does it get in Crestline in winter?
December nights average 36°. About 105 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 40°.
How hot does it get in Crestline?
July, with a typical high of 87° and a low of 62°. About 11 days a year reach 90° (Lake Arrowhead, CA).
When is the first and last frost in Crestline?
In half of years the last spring frost (32°) comes by May 5 and the first fall frost by November 2, about 176 frost-free days, at Lake Arrowhead, CA.
What growing zone is Crestline in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 21°.
What is the best time of year to visit Crestline?
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 Crestline getting warmer?
Yes: 1991–2020 averaged 2.0° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 89% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Crestline.
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.