Decatur, Texas climate: Normal weather by month, frost dates and records
Decatur's normal year runs from 33°F January nights to 95°F July afternoons, with 38.9 inches of precipitation and less than an inch of snow (0.8 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 18.3°C, January lows of 1°C, July highs of 35°C, 988 mm of precipitation a year.
- NOAA stationDecatur
- Station IDUSC00412334
- Location33.23°N 97.62°W
- Elevation970 ft (296 m)
- Population8,266
On October 23, the normal high in Decatur is 76°F and the normal low 51°F, and the chance of measurable rain or snow is 21%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Decatur.
- Jan 56° 33°
- Feb 60° 36°
- Mar 68° 44°
- Apr 76° 53°
- May 83° 62°
- Jun 91° 70°
- Jul 95° 74°
- Aug 95° 73°
- Sep 89° 65°
- Oct 79° 54°
- Nov 67° 43°
- Dec 58° 35°
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 Decatur each month?
July is the warmest month, with normal highs of 95°F; January the coldest, with normal lows of 33°F. The most precipitation falls in May (4.86 in), the least in January (2.09 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 56°F | 33°F | 44.7°F | 2.09 | 6 | <1 | 18 | 10 h 10 min |
| February | 60°F | 36°F | 48.3°F | 2.47 | 6 | <1 | 13 | 11 h |
| March | 68°F | 44°F | 56.2°F | 3.69 | 7 | <1 | 5 | 12 h |
| April | 76°F | 53°F | 64.1°F | 3.23 | 6 | 1 | 1 | 13 h |
| May | 83°F | 62°F | 72.5°F | 4.86 | 9 | 4 | <1 | 13 h 50 min |
| June | 91°F | 70°F | 80.6°F | 4.39 | 7 | 19 | <1 | 14 h 20 min |
| July | 95°F | 74°F | 84.7°F | 2.52 | 5 | 26 | <1 | 14 h 10 min |
| August | 95°F | 73°F | 84.1°F | 2.58 | 6 | 25 | <1 | 13 h 30 min |
| September | 89°F | 65°F | 76.7°F | 3.62 | 6 | 14 | <1 | 12 h 30 min |
| October | 79°F | 54°F | 66.2°F | 4.14 | 7 | 3 | 1 | 11 h 20 min |
| November | 67°F | 43°F | 55.0°F | 2.72 | 5 | <1 | 6 | 10 h 30 min |
| December | 58°F | 35°F | 46.6°F | 2.58 | 6 | <1 | 16 | 10 h |
| Year (annual) | 76°F | 54°F | 65.0°F | 38.89 | 75 | 91 | 60 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 13°C | 1°C | 7.1°C | 53 mm |
| February | 16°C | 2°C | 9.1°C | 63 mm |
| March | 20°C | 7°C | 13.4°C | 94 mm |
| April | 24°C | 11°C | 17.8°C | 82 mm |
| May | 28°C | 17°C | 22.5°C | 123 mm |
| June | 33°C | 21°C | 27.0°C | 112 mm |
| July | 35°C | 23°C | 29.3°C | 64 mm |
| August | 35°C | 23°C | 28.9°C | 66 mm |
| September | 31°C | 18°C | 24.8°C | 92 mm |
| October | 26°C | 12°C | 19.0°C | 105 mm |
| November | 19°C | 6°C | 12.8°C | 69 mm |
| December | 14°C | 2°C | 8.1°C | 66 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00412334; 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 Decatur?
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 (5).
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 USC00412334.
When is the last frost in Decatur?
In Decatur, the last spring frost (32°F) comes after March 20 in half of years and after April 11 in one year in ten; the first autumn frost comes before November 11 in half of years and before October 25 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 201 year in 10 after April 11; 9 in 10 after February 28
- First autumn frost, half of years before
- November 111 year in 10 before October 25; 9 in 10 before November 29
NOAA puts the median frost-free season at 237 days, and the season without a hard freeze (28°F) at 261 days.
A hard freeze (28°F) comes after March 6 in half of springs and before November 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Decatur in zone 8a in ZIP code 76234, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Decatur's NOAA station is in zone 8a: the coldest night of a typical year reaches 12°F (16 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 USC00412334; 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 Decatur?
In a normal year in Decatur, 91 days a year reach 90°F (14 of them 100°F or more), 60 nights fall to 32°F or colder and 75 days bring measurable precipitation.
- Days at 90°F or more
- 91a normal year
- Days at 100°F or more
- 14a normal year
- Nights at 32°F or colder
- 60a normal year
- Days that stay below freezing
- 3high of 32°F or less
- Days with 0.01 inch of precipitation
- 75a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00412334.
How sunny is Decatur?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Decatur, 4.8 kWh per square metre a day. July is the sunniest month (88%) and February the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.9 |
| February | 72% | 3.5 |
| March | 74% | 4.6 |
| April | 77% | 5.6 |
| May | 77% | 6.0 |
| June | 85% | 6.9 |
| July | 88% | 6.9 |
| August | 87% | 6.3 |
| September | 84% | 5.2 |
| October | 81% | 4.1 |
| November | 79% | 3.1 |
| December | 75% | 2.6 |
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 Decatur need?
A normal year in Decatur brings 2,534 heating degree days, 53% fewer than the median U.S. place (5,373), and 2,551 cooling degree days, 2.8 times the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 6,182 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 631 | 2 |
| February | 475 | 6 |
| March | 300 | 27 |
| April | 114 | 87 |
| May | 20 | 251 |
| June | 0 | 468 |
| July | 0 | 612 |
| August | 0 | 590 |
| September | 5 | 356 |
| October | 92 | 128 |
| November | 322 | 21 |
| December | 576 | 4 |
| Year (annual) | 2,534 | 2,551 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00412334. 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 Decatur's climate compare?
Decatur is warmer than 129 of the other 320 places with their own NOAA record in Texas, and wetter than 223. Across the 7,247 U.S. stations with normals, its annual mean of 65.0°F is warmer than 88%.
In the Köppen classification computed from these normals, Decatur 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 Decatur share this climate record?
Boyd has no NOAA station with 1991-2020 normals of its 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.
- Boyd, TX2,202 people · 11 mi S
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 Decatur's climate
What is the coldest month in Decatur?
January, with a normal high of 56°F and a normal low of 33°F. The warmest is July (95°F by day, 74°F at night).
Does it snow in Decatur?
Rarely: NOAA's normal is 0.8 inch a year.
What is the rainiest month in Decatur?
May, with 4.86 in of precipitation in a normal year; the driest is January with 2.09 in.
What plant hardiness zone is Decatur in?
The USDA's 2023 map puts Decatur in zone 8a in ZIP code 76234, the nearest ZIP area. By the same method at Decatur's NOAA station, the coldest night of a typical year reaches 12°F (16 years, 1991-2020): zone 8a.
How late can frost come in Decatur?
In half of years the last 32°F night comes after March 20; in one year in ten it comes after April 11. Waiting until April 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Bridgeport, TX9 miles from this station, 64.0°F a year
- Alvord, TX12 miles from this station, 63.5°F a year
- Denton, TX25 miles from this station, 64.5°F a year
- Fort Worth, TX25 miles from this station, 66.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made