Seymour, Texas climate: Normal weather by month, frost dates and records
Seymour's normal year runs from 28°F January nights to 97°F July afternoons, with 29.0 inches of precipitation and 2 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.3°C, January lows of −2°C, July highs of 36°C, 736 mm of precipitation a year.
- NOAA stationSeymour (3 mi NW)
- Station IDUSC00418221
- Location33.64°N 99.29°W
- Elevation1,311 ft (400 m)
- Population2,622
On October 23, the normal high in Seymour is 75°F and the normal low 48°F, and the chance of measurable rain or snow is 19%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Seymour.
- Jan 55° 28°
- Feb 59° 32°
- Mar 68° 40°
- Apr 77° 48°
- May 84° 59°
- Jun 93° 68°
- Jul 97° 72°
- Aug 97° 71°
- Sep 88° 63°
- Oct 78° 51°
- Nov 65° 38°
- Dec 56° 29°
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 Seymour each month?
July is the warmest month, with normal highs of 97°F; January the coldest, with normal lows of 28°F. The most precipitation falls in June (3.84 in), the least in January (1.17 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 55°F | 28°F | 41.7°F | 1.17 | 0.8 | 4 | <1 | 20 | 10 h 10 min |
| February | 59°F | 32°F | 45.5°F | 1.50 | 0.2 | 4 | <1 | 14 | 11 h |
| March | 68°F | 40°F | 53.8°F | 1.93 | 0.0 | 5 | 1 | 6 | 12 h |
| April | 77°F | 48°F | 62.4°F | 1.78 | 0.0 | 5 | 2 | 1 | 13 h |
| May | 84°F | 59°F | 71.2°F | 3.81 | 0.0 | 7 | 8 | <1 | 13 h 50 min |
| June | 93°F | 68°F | 80.3°F | 3.84 | 0.0 | 6 | 19 | <1 | 14 h 20 min |
| July | 97°F | 72°F | 84.7°F | 2.88 | 0.0 | 4 | 28 | <1 | 14 h 10 min |
| August | 97°F | 71°F | 83.7°F | 2.94 | 0.0 | 5 | 26 | <1 | 13 h 30 min |
| September | 88°F | 63°F | 75.3°F | 3.23 | 0.0 | 6 | 13 | <1 | 12 h 30 min |
| October | 78°F | 51°F | 64.4°F | 2.80 | 0.0 | 5 | 4 | 1 | 11 h 20 min |
| November | 65°F | 38°F | 51.5°F | 1.87 | 0.8 | 5 | <1 | 8 | 10 h 30 min |
| December | 56°F | 29°F | 42.7°F | 1.24 | 0.0 | 4 | <1 | 20 | 10 h |
| Year (annual) | 76°F | 50°F | 63.1°F | 28.99 | 1.8 | 60 | 101 | 69 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 13°C | −2°C | 5.4°C | 30 mm | 2 cm |
| February | 15°C | 0°C | 7.5°C | 38 mm | 1 cm |
| March | 20°C | 4°C | 12.1°C | 49 mm | 0 cm |
| April | 25°C | 9°C | 16.9°C | 45 mm | 0 cm |
| May | 29°C | 15°C | 21.8°C | 97 mm | 0 cm |
| June | 34°C | 20°C | 26.8°C | 98 mm | 0 cm |
| July | 36°C | 22°C | 29.3°C | 73 mm | 0 cm |
| August | 36°C | 22°C | 28.7°C | 75 mm | 0 cm |
| September | 31°C | 17°C | 24.1°C | 82 mm | 0 cm |
| October | 26°C | 11°C | 18.0°C | 71 mm | 0 cm |
| November | 18°C | 3°C | 10.8°C | 47 mm | 2 cm |
| December | 13°C | −2°C | 5.9°C | 31 mm | 0 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00418221; 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 Seymour?
Normal highs sit between 65°F and 85°F in March, April, May and October. Of those, April 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 USC00418221.
When is the last frost in Seymour?
In Seymour, the last spring frost (32°F) comes after March 30 in half of years and after April 18 in one year in ten; the first autumn frost comes before November 6 in half of years and before October 20 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 301 year in 10 after April 18; 9 in 10 after March 8
- First autumn frost, half of years before
- November 61 year in 10 before October 20; 9 in 10 before November 22
NOAA puts the median frost-free season at 222 days, and the season without a hard freeze (28°F) at 246 days.
A hard freeze (28°F) comes after March 12 in half of springs and before November 15 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Seymour in zone 8a in ZIP code 76380, the nearest ZIP area.
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00418221; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Seymour?
In a normal year in Seymour, 101 days a year reach 90°F (31 of them 100°F or more), 69 nights fall to 32°F or colder and 60 days bring measurable precipitation.
- Days at 90°F or more
- 101a normal year
- Days at 100°F or more
- 31a normal year
- Nights at 32°F or colder
- 69a normal year
- Days that stay below freezing
- 4high of 32°F or less
- Days with 0.01 inch of precipitation
- 60a normal year
- Days with 1 inch of snow or more
- 1a normal year
The highest temperature in this station's record (since 1905) is 120°F, on August 12, 1936; the lowest is −14°F, on January 4, 1947.
The wettest calendar year on that record is 1986, with 37.08 in; the snowiest season is 1946–47, with 13.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00418221; records: ACIS (NOAA Regional Climate Centers), station USC00418221. Records use complete months only; a month missing more than three days is left out.
How sunny is Seymour?
Over a year 83% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Seymour, 5.1 kWh per square metre a day. July is the sunniest month (89%) and February the cloudiest (76%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 81% | 3.2 |
| February | 76% | 3.8 |
| March | 79% | 5.0 |
| April | 82% | 6.1 |
| May | 81% | 6.5 |
| June | 88% | 7.2 |
| July | 89% | 7.0 |
| August | 88% | 6.4 |
| September | 85% | 5.3 |
| October | 83% | 4.3 |
| November | 82% | 3.3 |
| December | 78% | 2.8 |
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 Seymour need?
A normal year in Seymour brings 3,040 heating degree days, 43% fewer than the median U.S. place (5,373), and 2,384 cooling degree days, 2.6 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 5,735 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 721 | 0 |
| February | 548 | 2 |
| March | 362 | 16 |
| April | 144 | 66 |
| May | 29 | 222 |
| June | 1 | 460 |
| July | 0 | 611 |
| August | 0 | 578 |
| September | 11 | 320 |
| October | 117 | 98 |
| November | 417 | 11 |
| December | 691 | 0 |
| Year (annual) | 3,040 | 2,384 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00418221. 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 Seymour's climate compare?
Seymour is warmer than 60 of the other 320 places with their own NOAA record in Texas, and wetter than 147. Across the 7,247 U.S. stations with normals, its annual mean of 63.1°F is warmer than 83%.
In the Köppen classification computed from these normals, Seymour 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 Seymour's climate
What is the coldest month in Seymour?
January, with a normal high of 55°F and a normal low of 28°F. The warmest is July (97°F by day, 72°F at night).
Does it snow in Seymour?
Yes: 2 inches in a normal year, falling on 1 days with 0.1 inch or more, the most in January (0.8 inches).
What is the rainiest month in Seymour?
June, with 3.84 in of precipitation in a normal year; the driest is January with 1.17 in.
What plant hardiness zone is Seymour in?
The USDA's 2023 map puts Seymour in zone 8a in ZIP code 76380, the nearest ZIP area.
How late can frost come in Seymour?
In half of years the last 32°F night comes after March 30; in one year in ten it comes after April 18. Waiting until April 18 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Lake Kemp, TX11 miles from this station, 63.9°F a year
- Munday, TX23 miles from this station, 65.2°F a year
- Throckmorton (10 mi N), TX23 miles from this station, 63.9°F a year
- Truscott (3 mi W), TX34 miles from this station, 63.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made