Hallettsville, Texas climate: Normal weather by month, frost dates and records
Hallettsville's normal year runs from 45°F January nights to 98°F August afternoons, with 40.4 inches of precipitation and less than an inch of snow (0.1 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 22.1°C, January lows of 7°C, August highs of 36°C, 1,027 mm of precipitation a year.
- NOAA stationHallettsville (2 mi N)
- Station IDUSC00413873
- Location29.47°N 96.94°W
- Elevation275 ft (84 m)
- Population2,745
On October 23, the normal high in Hallettsville is 83°F and the normal low 60°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hallettsville.
- Jan 66° 45°
- Feb 69° 49°
- Mar 76° 55°
- Apr 82° 61°
- May 88° 69°
- Jun 94° 74°
- Jul 96° 75°
- Aug 98° 75°
- Sep 92° 71°
- Oct 85° 62°
- Nov 75° 53°
- Dec 67° 46°
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 Hallettsville each month?
August is the warmest month, with normal highs of 98°F; January the coldest, with normal lows of 45°F. The most precipitation falls in June (4.54 in), the least in February (2.30 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 66°F | 45°F | 55.3°F | 3.06 | 9 | <1 | 5 | 10 h 30 min |
| February | 69°F | 49°F | 59.0°F | 2.30 | 9 | <1 | 2 | 11 h 10 min |
| March | 76°F | 55°F | 65.2°F | 2.99 | 9 | <1 | 1 | 12 h |
| April | 82°F | 61°F | 71.4°F | 3.51 | 7 | 1 | <1 | 12 h 50 min |
| May | 88°F | 69°F | 78.4°F | 4.40 | 7 | 10 | <1 | 13 h 40 min |
| June | 94°F | 74°F | 83.6°F | 4.54 | 8 | 23 | <1 | 14 h |
| July | 96°F | 75°F | 85.8°F | 2.50 | 7 | 28 | <1 | 13 h 50 min |
| August | 98°F | 75°F | 86.3°F | 3.18 | 7 | 29 | <1 | 13 h 10 min |
| September | 92°F | 71°F | 81.7°F | 3.67 | 8 | 20 | <1 | 12 h 20 min |
| October | 85°F | 62°F | 73.6°F | 4.28 | 7 | 7 | <1 | 11 h 30 min |
| November | 75°F | 53°F | 63.6°F | 3.25 | 7 | <1 | 1 | 10 h 40 min |
| December | 67°F | 46°F | 56.6°F | 2.74 | 10 | <1 | 4 | 10 h 20 min |
| Year (annual) | 82°F | 61°F | 71.7°F | 40.42 | 94 | 117 | 13 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 19°C | 7°C | 12.9°C | 78 mm |
| February | 21°C | 9°C | 15.0°C | 58 mm |
| March | 24°C | 13°C | 18.4°C | 76 mm |
| April | 28°C | 16°C | 21.9°C | 89 mm |
| May | 31°C | 20°C | 25.8°C | 112 mm |
| June | 34°C | 23°C | 28.7°C | 115 mm |
| July | 36°C | 24°C | 29.9°C | 64 mm |
| August | 36°C | 24°C | 30.2°C | 81 mm |
| September | 34°C | 22°C | 27.6°C | 93 mm |
| October | 30°C | 17°C | 23.1°C | 109 mm |
| November | 24°C | 12°C | 17.6°C | 83 mm |
| December | 19°C | 8°C | 13.7°C | 70 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413873; 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 Hallettsville?
Normal highs sit between 65°F and 85°F in January, February, March, April, November and December. Of those, November has the fewest days with rain (7).
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 USC00413873.
When is the last frost in Hallettsville?
In Hallettsville, the last spring frost (32°F) comes after February 17 in half of years and after March 13 in one year in ten; the first autumn frost comes before December 4 in half of years and before November 14 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- February 171 year in 10 after March 13; 9 in 10 after January 19
- First autumn frost, half of years before
- December 41 year in 10 before November 14; 9 in 10 before January 8
NOAA puts the median frost-free season at 297 days, and the season without a hard freeze (28°F) at 331 days.
A hard freeze (28°F) comes after January 30 in half of springs and before December 27 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hallettsville in zone 9a in ZIP code 77964, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Hallettsville's NOAA station is in zone 9a: the coldest night of a typical year reaches 23°F (30 complete years).
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00413873; 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.
How hot and how cold does it get in Hallettsville?
In a normal year in Hallettsville, 117 days a year reach 90°F (13 of them 100°F or more), 13 nights fall to 32°F or colder and 94 days bring measurable precipitation.
- Days at 90°F or more
- 117a normal year
- Days at 100°F or more
- 13a normal year
- Nights at 32°F or colder
- 13a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 94a normal year
The highest temperature in this station's record (since 1893) is 111°F, on July 27, 1954; the lowest is 5°F, on December 23, 1989.
The wettest calendar year on that record is 1919, with 62.57 in; the snowiest season is 1925–26, with 5.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00413873; records: ACIS (NOAA Regional Climate Centers), station USC00413873. Records use complete months only; a month missing more than three days is left out.
How sunny is Hallettsville?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hallettsville, 4.7 kWh per square metre a day. August is the sunniest month (85%) and February the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 2.9 |
| February | 66% | 3.4 |
| March | 71% | 4.4 |
| April | 74% | 5.3 |
| May | 78% | 6.0 |
| June | 83% | 6.5 |
| July | 84% | 6.4 |
| August | 85% | 6.1 |
| September | 81% | 5.1 |
| October | 82% | 4.4 |
| November | 77% | 3.3 |
| December | 70% | 2.7 |
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 Hallettsville need?
A normal year in Hallettsville brings 1,112 heating degree days, 79% fewer than the median U.S. place (5,373), and 3,587 cooling degree days, 4.0 times the median (908). One month needs 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 8,090 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 327 | 25 |
| February | 211 | 43 |
| March | 102 | 109 |
| April | 22 | 213 |
| May | 1 | 417 |
| June | 0 | 559 |
| July | 0 | 645 |
| August | 0 | 660 |
| September | 0 | 501 |
| October | 19 | 287 |
| November | 136 | 96 |
| December | 295 | 33 |
| Year (annual) | 1,112 | 3,587 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413873. 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.
Has Hallettsville been warmer than normal lately?
2025 averaged 72.9°F, 1.2°F above the 1991-2020 normal of 71.7°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.0°F | +0.3°F | 44.24 |
| 2022 | 72.0°F | +0.3°F | 28.11 |
| 2023 | 73.9°F | +2.2°F | 32.73 |
| 2024 | 73.8°F | +2.1°F | 41.28 |
| 2025 | 72.9°F | +1.2°F | 28.03 |
Over 77 complete years from 1894 to 2025, the station's annual mean temperature rose at a fitted 2.8°F per century (+0.16°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00413873; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Hallettsville's climate compare?
Hallettsville is warmer than 285 of the other 320 places with their own NOAA record in Texas, and wetter than 232. Across the 7,247 U.S. stations with normals, its annual mean of 71.7°F is warmer than 96%.
In the Köppen classification computed from these normals, Hallettsville is Cfa: temperate, no dry season, hot summer. 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.
Questions about Hallettsville's climate
What is the coldest month in Hallettsville?
January, with a normal high of 66°F and a normal low of 45°F. The warmest is August (98°F by day, 75°F at night).
Does it snow in Hallettsville?
Rarely: NOAA's normal is 0.1 inch a year.
What is the rainiest month in Hallettsville?
June, with 4.54 in of precipitation in a normal year; the driest is February with 2.30 in.
What plant hardiness zone is Hallettsville in?
The USDA's 2023 map puts Hallettsville in zone 9a in ZIP code 77964, the nearest ZIP area. By the same method at Hallettsville's NOAA station, the coldest night of a typical year reaches 23°F (30 years, 1991-2020): zone 9a.
How late can frost come in Hallettsville?
In half of years the last 32°F night comes after February 17; in one year in ten it comes after March 13. Waiting until March 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Flatonia, TX14 miles from this station, 67.9°F a year
- Yoakum, TX19 miles from this station, 69.1°F a year
- Columbus, TX27 miles from this station, 68.8°F a year
- Cheapside, TX30 miles from this station, 69.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made