Hillsboro, Texas climate: Normal weather by month, frost dates and records
Hillsboro's normal year runs from 34°F January nights to 97°F August afternoons, with 38.7 inches of precipitation and less than an inch of snow (0.7 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 18.9°C, January lows of 1°C, August highs of 36°C, 984 mm of precipitation a year.
- NOAA stationHillsboro
- Station IDUSC00414182
- Location32.02°N 97.11°W
- Elevation550 ft (168 m)
- From the centerunder 1 mile
- Population8,878
On October 23, the normal high in Hillsboro is 78°F and the normal low 53°F, and the chance of measurable rain or snow is 23%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hillsboro.
- Jan 59° 34°
- Feb 63° 38°
- Mar 70° 45°
- Apr 77° 53°
- May 84° 62°
- Jun 92° 70°
- Jul 96° 73°
- Aug 97° 73°
- Sep 91° 66°
- Oct 80° 55°
- Nov 69° 44°
- Dec 60° 36°
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 Hillsboro each month?
August is the warmest month, with normal highs of 97°F; January the coldest, with normal lows of 34°F. The most precipitation falls in October (5.05 in), the least in July (1.65 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 59°F | 34°F | 46.5°F | 2.74 | 7 | <1 | 12 | 10 h 20 min |
| February | 63°F | 38°F | 50.3°F | 2.77 | 7 | <1 | 7 | 11 h |
| March | 70°F | 45°F | 57.2°F | 3.57 | 8 | <1 | 3 | 12 h |
| April | 77°F | 53°F | 65.1°F | 3.68 | 7 | 1 | <1 | 13 h |
| May | 84°F | 62°F | 73.1°F | 4.51 | 9 | 6 | <1 | 13 h 50 min |
| June | 92°F | 70°F | 80.8°F | 3.61 | 7 | 20 | <1 | 14 h 10 min |
| July | 96°F | 73°F | 84.4°F | 1.65 | 4 | 29 | <1 | 14 h |
| August | 97°F | 73°F | 84.9°F | 2.18 | 5 | 28 | <1 | 13 h 20 min |
| September | 91°F | 66°F | 78.3°F | 3.15 | 6 | 17 | <1 | 12 h 20 min |
| October | 80°F | 55°F | 67.8°F | 5.05 | 7 | 4 | <1 | 11 h 30 min |
| November | 69°F | 44°F | 56.3°F | 2.73 | 7 | <1 | 4 | 10 h 30 min |
| December | 60°F | 36°F | 48.2°F | 3.10 | 7 | <1 | 10 | 10 h |
| Year (annual) | 78°F | 54°F | 66.1°F | 38.74 | 80 | 105 | 37 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 1°C | 8.1°C | 70 mm |
| February | 17°C | 3°C | 10.2°C | 70 mm |
| March | 21°C | 7°C | 14.0°C | 91 mm |
| April | 25°C | 12°C | 18.4°C | 93 mm |
| May | 29°C | 17°C | 22.8°C | 115 mm |
| June | 33°C | 21°C | 27.1°C | 92 mm |
| July | 36°C | 23°C | 29.1°C | 42 mm |
| August | 36°C | 23°C | 29.4°C | 55 mm |
| September | 33°C | 19°C | 25.7°C | 80 mm |
| October | 27°C | 13°C | 19.9°C | 128 mm |
| November | 20°C | 7°C | 13.5°C | 69 mm |
| December | 16°C | 2°C | 9.0°C | 79 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00414182; 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 Hillsboro?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. 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 USC00414182.
When is the last frost in Hillsboro?
In Hillsboro, the last spring frost (32°F) comes after March 21 in half of years and after April 8 in one year in ten; the first autumn frost comes before November 10 in half of years and before October 28 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
- March 211 year in 10 after April 8; 9 in 10 after March 2
- First autumn frost, half of years before
- November 101 year in 10 before October 28; 9 in 10 before November 29
NOAA puts the median frost-free season at 235 days, and the season without a hard freeze (28°F) at 257 days.
A hard freeze (28°F) comes after March 9 in half of springs and before November 22 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hillsboro in zone 8b in ZIP code 76645, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Hillsboro's NOAA station is in zone 8b: the coldest night of a typical year reaches 16°F (25 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 USC00414182; 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 Hillsboro?
In a normal year in Hillsboro, 105 days a year reach 90°F (18 of them 100°F or more), 37 nights fall to 32°F or colder and 80 days bring measurable precipitation.
- Days at 90°F or more
- 105a normal year
- Days at 100°F or more
- 18a normal year
- Nights at 32°F or colder
- 37a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 80a normal year
The highest temperature in this station's record (since 1903) is 113°F, on July 10, 1917; the lowest is −6°F, on December 23, 1989.
The wettest calendar year on that record is 2015, with 60.97 in; the snowiest season is 1929–30, with 27.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00414182; records: ACIS (NOAA Regional Climate Centers), station USC00414182. Records use complete months only; a month missing more than three days is left out.
How sunny is Hillsboro?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hillsboro, 4.8 kWh per square metre a day. July is the sunniest month (88%) and February the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 3.0 |
| February | 71% | 3.5 |
| March | 74% | 4.6 |
| April | 76% | 5.6 |
| May | 77% | 6.0 |
| June | 85% | 6.8 |
| July | 88% | 6.9 |
| August | 87% | 6.3 |
| September | 84% | 5.2 |
| October | 81% | 4.2 |
| November | 78% | 3.2 |
| December | 75% | 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 Hillsboro need?
A normal year in Hillsboro brings 2,257 heating degree days, 58% fewer than the median U.S. place (5,373), and 2,675 cooling degree days, 2.9 times the median (908). Three months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 6,434 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 577 | 2 |
| February | 420 | 7 |
| March | 267 | 25 |
| April | 93 | 95 |
| May | 13 | 264 |
| June | 0 | 473 |
| July | 0 | 601 |
| August | 0 | 617 |
| September | 4 | 401 |
| October | 72 | 158 |
| November | 287 | 28 |
| December | 524 | 5 |
| Year (annual) | 2,257 | 2,675 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00414182. 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 Hillsboro been warmer than normal lately?
2025 averaged 68.1°F, 2.0°F above the 1991-2020 normal of 66.1°F. 4 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 67.7°F | +1.6°F | 26.33 |
| 2023 | 69.4°F | +3.3°F | 33.29 |
| 2024 | 69.1°F | +3.0°F | 55.65 |
| 2025 | 68.1°F | +2.0°F | 41.66 |
Over 48 complete years from 1952 to 2025, the station's annual mean temperature rose at a fitted 3.9°F per century (+0.21°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00414182; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Hillsboro's climate compare?
Hillsboro is warmer than 179 of the other 320 places with their own NOAA record in Texas, and wetter than 222. Across the 7,247 U.S. stations with normals, its annual mean of 66.1°F is warmer than 90%.
In the Köppen classification computed from these normals, Hillsboro 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.
Which places near Hillsboro share this climate record?
8 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.
- West, TX2,597 people · 15 mi S
- Itasca, TX1,885 people · 10 mi N
- Milford, TX801 people · 12 mi NE
- Abbott, TX370 people · 9 mi S
- Carl's Corner, TX227 people · 6 mi NE
- Penelope, TX189 people · 15 mi SE
- Bynum, TX179 people · 7 mi SE
- Mertens, TX156 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 Hillsboro's climate
What is the coldest month in Hillsboro?
January, with a normal high of 59°F and a normal low of 34°F. The warmest is August (97°F by day, 73°F at night).
Does it snow in Hillsboro?
Rarely: NOAA's normal is 0.7 inch a year.
What is the rainiest month in Hillsboro?
October, with 5.05 in of precipitation in a normal year; the driest is July with 1.65 in.
What plant hardiness zone is Hillsboro in?
The USDA's 2023 map puts Hillsboro in zone 8b in ZIP code 76645, the nearest ZIP area. By the same method at Hillsboro's NOAA station, the coldest night of a typical year reaches 16°F (25 years, 1991-2020): zone 8b.
How late can frost come in Hillsboro?
In half of years the last 32°F night comes after March 21; in one year in ten it comes after April 8. Waiting until April 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Whitney, TX19 miles from this station, 65.4°F a year
- Navarro Mills Dam, TX25 miles from this station, 65.9°F a year
- Cleburne, TX27 miles from this station, 65.0°F a year
- Waco, TX29 miles from this station, 67.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made