Photo: Renelibrary · CC BY-SA 4.0Caldwell reaches 100° on about 27 days a year, more than 97% of U.S. towns
In January the night’s low is typically 39°. Winters are mild: January nights here are milder than in 87% of U.S. towns. Since 1901–2000, the year has warmed by 1.1°, most of all in February. Plan time outside from February to April and October to December, when highs sit at 63–82°.
A year in Caldwell at a glance
Each month’s typical high and low, and what it brings.
What stands out about Caldwell’s climate
Compared with towns across the U.S., with Caldwell’s place in Texas beside it.
What a year in Caldwell feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 238 frost-free days a year
In half of years the last 32° night comes by March 18 and the first by November 9. Frost and day counts come from NOAA’s station at Somerville Dam, TX, 16 miles from the town’s center, 110 ft lower.
The 2023 USDA map puts Caldwell’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 22°. 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 41 inches of rain a year
May is the wettest month and July the driest. Rain falls on about 65 days a year. Snow is rare: about 0.0" in a normal year at Caldwell, TX, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Caldwell
42% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from December 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 Somerville Dam, TX.
Living with Caldwell’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
238 frost-free days in zone 9a. The last frost comes by Mar 18 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 9.
Months with highs of 62–84° and lows of 40° or more: February, March, April, October, November and December. 1.6 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Caldwell from natural hazards, river flooding is the largest share (41%); heat waves, cold waves, winter storms and ice storms together are 31%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Caldwell and similar climates
TownRatings has no climate map of the towns around Caldwell yet.
Climates most like Caldwell’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 |
|---|---|---|---|---|
| Caldwell, TX | 39° | 95° | 41" | 0.0" |
| Clearlake, CA | 35° | 93° | 40" | 0.4" |
| Dublin, GA | 37° | 93° | 47" | 0.0" |
| Cayce, SC | 35° | 93° | 46" | 1.2" |
| Durant, OK | 32° | 94° | 43" | 2.0" |
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 Caldwell averaged 1.1° warmer than the 1900s. The biggest change is in February (+2.0°).
A smaller shift than in 71% 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 Caldwell compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Caldwell’s place among Texas’.
Caldwell weather by month
Highs, lows and precipitation from NOAA’s grid at Caldwell’s center; snow, wet days and snow on the ground from Caldwell, TX. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 61° | 39° | 3.4" | 0.0" | 6 | 0 | 45° – 56° |
| February | 65° | 43° | 2.6" | 0.0" | 6 | 0 | 46° – 63° |
| March | 72° | 50° | 3.5" | 0.0" | 7 | 0 | 54° – 68° |
| April | 79° | 56° | 2.7" | 0.0" | 5 | 0 | 62° – 73° |
| May | 85° | 65° | 5.1" | 0.0" | 6 | 0 | 71° – 79° |
| June | 92° | 71° | 3.6" | 0.0" | 5 | 0 | 78° – 86° |
| July | 95° | 73° | 2.0" | 0.0" | 4 | 0 | 81° – 88° |
| August | 96° | 73° | 2.8" | 0.0" | 4 | 0 | 80° – 90° |
| September | 90° | 67° | 3.4" | 0.0" | 5 | 0 | 75° – 84° |
| October | 82° | 57° | 4.4" | 0.0" | 5 | 0 | 67° – 75° |
| November | 70° | 48° | 3.5" | 0.0" | 5 | 0 | 53° – 65° |
| December | 63° | 41° | 3.6" | 0.0" | 7 | 0 | 45° – 56° |
| Year | 79° | 57° | 40.6" | 0.0" | 65 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 46° to 63°. July is the most reliable, staying within 7°.
Where Caldwell’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 Caldwell’s center.
- Snow: Caldwell, TX (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Somerville Dam, TX, 16 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 Caldwell’s climate
What is the weather like in Caldwell?
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 Caldwell in winter?
January nights average 39°. About 37 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 45°.
How much snow does Caldwell get?
About 0.0 inches in a normal winter at Caldwell, TX, so most winters see none.
How hot does it get in Caldwell?
July, with a typical high of 95° and a low of 73°. About 125 days a year reach 90° and 27 reach 100° (Somerville Dam, TX).
When is the first and last frost in Caldwell?
In half of years the last spring frost (32°) comes by March 18 and the first fall frost by November 9, about 238 frost-free days, at Somerville Dam, TX.
What growing zone is Caldwell in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 22°.
What is the best time of year to visit Caldwell?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Caldwell getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Caldwell.
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.