Photo: Jsmithwikigt · CC BY 3.0Grand Terrace reaches 100° on about 24 days a year, more than 97% of U.S. towns
The coldest hours of a January night bottom out at 43° on average. A year here swings 55° from midwinter lows to midsummer highs. Precipitation is light here, less than falls on 95% of U.S. towns. Picnics, hikes and garden evenings come into their own from October to May, with highs of 67–84°.
A year in Grand Terrace at a glance
Each month’s typical high and low, and what it brings.
What stands out about Grand Terrace’s climate
Compared with towns across the U.S., with Grand Terrace’s place in California beside it.
What a year in Grand Terrace feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 24 days a year reach 100°
And 103 days reach 90°. Frost and day counts come from NOAA’s station at Riverside Citrus Exp, CA, 5 miles from the town’s center, 110 ft lower.
The 2023 USDA map puts Grand Terrace’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 32°. 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
February is the wettest month and June the driest. Rain falls on about 28 days a year. Snow is rare: about 0.0" in a normal year at Riverside Fire Stn 3, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Grand Terrace
41% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from December.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Riverside Citrus Exp, CA.
Living with Grand Terrace’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10a. Frost comes about 1 winter in 2, so the growing year is set by heat, not cold: 24 days at 100° make midsummer the hard season for gardens.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, May, October, November and December. 3.7 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Grand Terrace from natural hazards, earthquakes are the largest share (55%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Grand Terrace and its neighbors
Every town next door is within a degree of Grand Terrace in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Grand Terrace’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 |
|---|---|---|---|---|
| Grand Terrace, CA | 43° | 95° | 12" | 0.0" |
| Corona de Tucson, AZ | 36° | 96° | 14" | 0.1" |
| Del Rio, TX | 40° | 98° | 19" | 0.2" |
| Anthony, NM | 31° | 96° | 9" | 0.0" |
| Medford, OR | 32° | 92° | 19" | 3.4" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Grand Terrace averaged 2.1° warmer than the 1900s. The biggest change is in January (+2.9°).
A bigger shift than in 92% 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 Grand Terrace compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Grand Terrace’s place among California’s.
Grand Terrace weather by month
Highs, lows and precipitation from NOAA’s grid at Grand Terrace’s center; snow, wet days and snow on the ground from Riverside Fire Stn 3, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 68° | 43° | 2.7" | 0.0" | 5 | 0 | 51° – 62° |
| February | 69° | 44° | 3.3" | 0.0" | 6 | 0 | 48° – 66° |
| March | 72° | 46° | 1.8" | 0.0" | 5 | 0 | 52° – 66° |
| April | 77° | 49° | 0.8" | 0.0" | 2 | 0 | 58° – 67° |
| May | 81° | 54° | 0.3" | 0.0" | 2 | 0 | 61° – 74° |
| June | 89° | 59° | 0.1" | 0.0" | 0 | 0 | 68° – 79° |
| July | 95° | 63° | 0.1" | 0.0" | 1 | 0 | 75° – 85° |
| August | 97° | 64° | 0.1" | 0.0" | 0 | 0 | 78° – 84° |
| September | 92° | 61° | 0.1" | 0.0" | 0 | 0 | 73° – 81° |
| October | 84° | 55° | 0.5" | 0.0" | 1 | 0 | 65° – 74° |
| November | 75° | 47° | 0.7" | 0.0" | 2 | 0 | 53° – 66° |
| December | 67° | 42° | 1.9" | 0.0" | 4 | 0 | 50° – 62° |
| Year | 80° | 52° | 12.3" | 0.0" | 28 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 48° to 66°. August is the most reliable, staying within 7°.
Where Grand Terrace’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 Grand Terrace’s center.
- Snow: Riverside Fire Stn 3, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Riverside Citrus Exp, CA, 5 miles from the town’s center, 110 ft lower; 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 Grand Terrace’s climate
What is the weather like in Grand Terrace?
A typical July afternoon reaches 95°, a January night drops to 43°, and snow is almost unheard of. Milder January nights than 91% of U.S. towns; hotter July afternoons than 95% of U.S. towns.
How cold does it get in Grand Terrace in winter?
December nights average 42°. About 2 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 50°.
How much snow does Grand Terrace get?
About 0.0 inches in a normal winter at Riverside Fire Stn 3, CA, so most winters see none.
How hot does it get in Grand Terrace?
July, with a typical high of 95° and a low of 63°. About 103 days a year reach 90° and 24 reach 100° (Riverside Citrus Exp, CA).
When is the first and last frost in Grand Terrace?
Most years have no frost at all: a 32° night comes in about 45% of winters at Riverside Citrus Exp, CA, usually in December or January.
What growing zone is Grand Terrace in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 32°.
What is the best time of year to visit Grand Terrace?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, May, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Grand Terrace getting warmer?
Yes: 1991–2020 averaged 2.1° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 92% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Grand Terrace.
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.