Redlands, California climate: Normal weather by month, frost dates and records
Redlands's normal year runs from 40°F December nights to 96°F August afternoons, with 12.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 18.4°C, December lows of 5°C, August highs of 36°C, 327 mm of precipitation a year.
- NOAA stationRedlands
- Station IDUSC00047306
- Location34.04°N 117.19°W
- Elevation1,410 ft (430 m)
- From the center2 miles
- Population74,279
On October 23, the normal high in Redlands is 81°F and the normal low 51°F, and the chance of measurable rain or snow is 10%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Redlands.
- Jan 67° 41°
- Feb 67° 42°
- Mar 71° 45°
- Apr 76° 48°
- May 80° 52°
- Jun 89° 56°
- Jul 95° 63°
- Aug 96° 63°
- Sep 92° 60°
- Oct 83° 53°
- Nov 75° 45°
- Dec 67° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Redlands each month?
August is the warmest month, with normal highs of 96°F; December the coldest, with normal lows of 40°F. The most precipitation falls in February (2.99 in), the least in August (0.09 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 67°F | 41°F | 53.8°F | 2.76 | 7 | <1 | 1 | 10 h 10 min |
| February | 67°F | 42°F | 54.8°F | 2.99 | 8 | <1 | <1 | 11 h |
| March | 71°F | 45°F | 57.7°F | 2.01 | 6 | 1 | <1 | 11 h 50 min |
| April | 76°F | 48°F | 61.7°F | 0.91 | 4 | 3 | <1 | 13 h |
| May | 80°F | 52°F | 66.4°F | 0.35 | 3 | 6 | <1 | 13 h 50 min |
| June | 89°F | 56°F | 72.4°F | 0.10 | 1 | 14 | <1 | 14 h 20 min |
| July | 95°F | 63°F | 78.9°F | 0.10 | 1 | 24 | <1 | 14 h 10 min |
| August | 96°F | 63°F | 79.6°F | 0.09 | 1 | 26 | <1 | 13 h 30 min |
| September | 92°F | 60°F | 76.0°F | 0.13 | 1 | 21 | <1 | 12 h 30 min |
| October | 83°F | 53°F | 67.9°F | 0.53 | 3 | 9 | <1 | 11 h 20 min |
| November | 75°F | 45°F | 60.1°F | 0.89 | 4 | 1 | <1 | 10 h 30 min |
| December | 67°F | 40°F | 53.3°F | 2.01 | 6 | <1 | 1 | 9 h 50 min |
| Year (annual) | 80°F | 51°F | 65.2°F | 12.87 | 43 | 104 | 3 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 19°C | 5°C | 12.1°C | 70 mm |
| February | 20°C | 6°C | 12.7°C | 76 mm |
| March | 22°C | 7°C | 14.3°C | 51 mm |
| April | 24°C | 9°C | 16.5°C | 23 mm |
| May | 27°C | 11°C | 19.1°C | 9 mm |
| June | 31°C | 14°C | 22.4°C | 3 mm |
| July | 35°C | 17°C | 26.1°C | 3 mm |
| August | 36°C | 17°C | 26.4°C | 2 mm |
| September | 34°C | 15°C | 24.4°C | 3 mm |
| October | 28°C | 12°C | 19.9°C | 13 mm |
| November | 24°C | 7°C | 15.6°C | 23 mm |
| December | 19°C | 5°C | 11.8°C | 51 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00047306; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Redlands?
Normal highs sit between 65°F and 85°F in January, February, March, April, May, October, November and December. Of those, May has the fewest days with rain (3).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00047306.
When is the last frost in Redlands?
In Redlands, the last spring frost (32°F) comes after January 27 in half of years and after February 28 in one year in ten; the first autumn frost comes before December 19 in half of years and before December 1 in one year in ten. A night at 32°F or colder comes at all in 88% of years here (NOAA).
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- January 271 year in 10 after February 28; 9 in 10 after December 21
- First autumn frost, half of years before
- December 191 year in 10 before December 1; 9 in 10 before January 26
NOAA puts the median frost-free season at 329 days, and the season without a hard freeze (28°F) at 365 days.
A hard freeze (28°F) comes after January 7 in half of springs and before January 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Redlands in zones 9b to 10a across its 3 ZIP code areas (9b in 92373, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Redlands's NOAA station is in zone 10a: the coldest night of a typical year reaches 30°F (22 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00047306; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Redlands ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Redlands's 3 ZIP code areas run from zone 9b to 10a: 2 in 10a and 1 in 9b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Redlands?
In a normal year in Redlands, 104 days a year reach 90°F (26 of them 100°F or more), 3 nights fall to 32°F or colder and 43 days bring measurable precipitation.
- Days at 90°F or more
- 104a normal year
- Days at 100°F or more
- 26a normal year
- Nights at 32°F or colder
- 3a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 43a normal year
The highest temperature in this station's record (since 1898) is 118°F, on July 22, 2006; the lowest is 18°F, on January 7, 1913.
The wettest calendar year on that record is 1978, with 27.00 in; the snowiest season is 1964–65, with 2.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00047306; records: ACIS (NOAA Regional Climate Centers), station USC00047306. Records use complete months only; a month missing more than three days is left out.
How sunny is Redlands?
Over a year 92% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Redlands, 5.8 kWh per square metre a day. August is the sunniest month (96%) and December the cloudiest (85%). Among the 459 U.S. places of 50,000 or more, that ranks tied 3rd (with 7 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 85% | 3.3 |
| February | 85% | 4.2 |
| March | 89% | 5.7 |
| April | 90% | 6.9 |
| May | 92% | 7.8 |
| June | 96% | 8.4 |
| July | 94% | 7.9 |
| August | 96% | 7.4 |
| September | 95% | 6.3 |
| October | 93% | 4.9 |
| November | 90% | 3.6 |
| December | 85% | 2.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Redlands need?
A normal year in Redlands brings 1,647 heating degree days, 69% fewer than the median U.S. place (5,373), and 1,751 cooling degree days, 93% more than the median (908). Two months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,663 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 347 | 1 |
| February | 287 | 2 |
| March | 234 | 9 |
| April | 137 | 36 |
| May | 57 | 99 |
| June | 8 | 232 |
| July | 0 | 432 |
| August | 0 | 451 |
| September | 3 | 331 |
| October | 41 | 131 |
| November | 170 | 25 |
| December | 363 | 1 |
| Year (annual) | 1,647 | 1,751 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00047306. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Redlands's climate compare?
Redlands is warmer than 185 of the other 218 places with their own NOAA record in California, and wetter than 77. Across the 7,247 U.S. stations with normals, its annual mean of 65.2°F is warmer than 88%.
In the Köppen classification computed from these normals, Redlands is BSh: hot semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Redlands share this climate record?
11 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- San Bernardino, CAalso near: Lake Arrowhead (10 mi, 51.1°F a year); Riverside (15 mi, 66.2°F a year)224,775 people · 9 mi NW
- Moreno Valley, CAalso near: Riverside (13 mi, 66.2°F a year); San Jacinto (16 mi, 65.0°F a year)213,919 people · 8 mi S
- Highland, CAalso near: Lake Arrowhead (9 mi, 51.1°F a year); Big Bear Lake (17 mi, 48.0°F a year)56,499 people · 6 mi N
- Yucaipa, CAalso near: Big Bear Lake (16 mi, 48.0°F a year); San Jacinto (17 mi, 65.0°F a year)54,465 people · 9 mi E
- Colton, CAalso near: Riverside (10 mi, 66.2°F a year); Lake Arrowhead (15 mi, 51.1°F a year)53,528 people · 8 mi W
- Loma Linda, CA25,197 people · 3 mi W
- Grand Terrace, CA12,979 people · 7 mi W
- Calimesa, CA11,150 people · 9 mi SE
- Mentone, CA9,487 people · 5 mi E
- Highgrove, CA7,164 people · 7 mi W
- Oak Glen, CA387 people · 13 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Redlands's climate
What is the coldest month in Redlands?
December, with a normal high of 67°F and a normal low of 40°F. The warmest is August (96°F by day, 63°F at night).
Does it snow in Redlands?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Redlands?
February, with 2.99 in of precipitation in a normal year; the driest is August with 0.09 in.
What plant hardiness zone is Redlands in?
The USDA's 2023 map puts Redlands in zones 9b to 10a across its 3 ZIP code areas (9b in 92373, the largest). By the same method at Redlands's NOAA station, the coldest night of a typical year reaches 30°F (22 years, 1991-2020): zone 10a.
How late can frost come in Redlands?
In half of years the last 32°F night comes after January 27; in one year in ten it comes after February 28. Waiting until February 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Redlands in OctoberThis month day by day, its records and recent years
- California climateThe statewide normals and every place in the state
- Lake Arrowhead, CA14 miles from this station, 51.1°F a year
- Riverside, CA15 miles from this station, 66.2°F a year
- San Jacinto, CA21 miles from this station, 65.0°F a year
- Big Bear Lake, CA21 miles from this station, 48.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made