Flatonia, Texas climate: Normal weather by month, frost dates and records
Flatonia's normal year runs from 40°F January nights to 95°F August afternoons, with 37.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 19.9°C, January lows of 4°C, August highs of 35°C, 962 mm of precipitation a year.
- NOAA stationFlatonia (4 mi SE)
- Station IDUSC00413183
- Location29.63°N 97.06°W
- Elevation470 ft (143 m)
- Population1,398
On October 23, the normal high in Flatonia is 79°F and the normal low 56°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 Flatonia.
- Jan 62° 40°
- Feb 66° 44°
- Mar 72° 49°
- Apr 79° 57°
- May 85° 64°
- Jun 91° 70°
- Jul 94° 71°
- Aug 95° 71°
- Sep 90° 67°
- Oct 82° 58°
- Nov 71° 48°
- Dec 63° 42°
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 Flatonia each month?
August is the warmest month, with normal highs of 95°F; January the coldest, with normal lows of 40°F. The most precipitation falls in May (4.43 in), the least in July (2.05 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 62°F | 40°F | 50.9°F | 2.80 | 8 | <1 | 4 | 10 h 30 min |
| February | 66°F | 44°F | 54.7°F | 2.12 | 8 | <1 | 2 | 11 h 10 min |
| March | 72°F | 49°F | 60.7°F | 2.94 | 7 | <1 | 1 | 12 h |
| April | 79°F | 57°F | 67.9°F | 3.31 | 6 | 1 | <1 | 12 h 50 min |
| May | 85°F | 64°F | 74.6°F | 4.43 | 7 | 7 | <1 | 13 h 40 min |
| June | 91°F | 70°F | 80.3°F | 3.77 | 8 | 19 | <1 | 14 h |
| July | 94°F | 71°F | 82.7°F | 2.05 | 5 | 26 | <1 | 13 h 50 min |
| August | 95°F | 71°F | 83.1°F | 2.81 | 6 | 27 | <1 | 13 h 10 min |
| September | 90°F | 67°F | 78.4°F | 3.39 | 8 | 17 | <1 | 12 h 20 min |
| October | 82°F | 58°F | 69.9°F | 4.40 | 6 | 4 | <1 | 11 h 30 min |
| November | 71°F | 48°F | 59.8°F | 3.18 | 7 | <1 | 1 | 10 h 40 min |
| December | 63°F | 42°F | 52.4°F | 2.67 | 8 | <1 | 3 | 10 h 20 min |
| Year (annual) | 79°F | 57°F | 67.9°F | 37.87 | 85 | 101 | 11 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 17°C | 4°C | 10.5°C | 71 mm |
| February | 19°C | 6°C | 12.6°C | 54 mm |
| March | 22°C | 10°C | 15.9°C | 75 mm |
| April | 26°C | 14°C | 19.9°C | 84 mm |
| May | 30°C | 18°C | 23.7°C | 113 mm |
| June | 33°C | 21°C | 26.8°C | 96 mm |
| July | 34°C | 22°C | 28.2°C | 52 mm |
| August | 35°C | 22°C | 28.4°C | 71 mm |
| September | 32°C | 20°C | 25.8°C | 86 mm |
| October | 28°C | 15°C | 21.1°C | 112 mm |
| November | 22°C | 9°C | 15.4°C | 81 mm |
| December | 17°C | 5°C | 11.3°C | 68 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413183; 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 Flatonia?
Normal highs sit between 65°F and 85°F in February, March, April, October and November. Of those, April has the fewest days with rain (6).
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 USC00413183.
When is the last frost in Flatonia?
In Flatonia, the last spring frost (32°F) comes after March 2 in half of years and after March 21 in one year in ten; the first autumn frost comes before November 27 in half of years and before November 8 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 21 year in 10 after March 21; 9 in 10 after February 4
- First autumn frost, half of years before
- November 271 year in 10 before November 8; 9 in 10 before December 18
NOAA puts the median frost-free season at 271 days, and the season without a hard freeze (28°F) at 300 days.
A hard freeze (28°F) comes after February 16 in half of springs and before December 9 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Flatonia in zone 9a in ZIP code 78941, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Flatonia's NOAA station is in zone 9a: the coldest night of a typical year reaches 24°F (23 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 USC00413183; 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 Flatonia?
In a normal year in Flatonia, 101 days a year reach 90°F (8 of them 100°F or more), 11 nights fall to 32°F or colder and 85 days bring measurable precipitation.
- Days at 90°F or more
- 101a normal year
- Days at 100°F or more
- 8a normal year
- Nights at 32°F or colder
- 11a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 85a normal year
The highest temperature in this station's record (since 1908) is 111°F, on August 23, 1917; the lowest is 3°F, on December 23, 1989.
The wettest calendar year on that record is 1919, with 68.74 in; the snowiest season is 1984–85, with 7.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00413183; records: ACIS (NOAA Regional Climate Centers), station USC00413183. Records use complete months only; a month missing more than three days is left out.
How sunny is Flatonia?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Flatonia, 4.8 kWh per square metre a day. August is the sunniest month (87%) and February the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 72% | 3.0 |
| February | 68% | 3.5 |
| March | 71% | 4.5 |
| April | 74% | 5.3 |
| May | 78% | 5.9 |
| June | 84% | 6.7 |
| July | 86% | 6.6 |
| August | 87% | 6.3 |
| September | 81% | 5.2 |
| October | 82% | 4.4 |
| November | 76% | 3.3 |
| December | 71% | 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 Flatonia need?
A normal year in Flatonia brings 1,635 heating degree days, 70% fewer than the median U.S. place (5,373), and 2,735 cooling degree days, 3.0 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 6,871 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 443 | 8 |
| February | 304 | 15 |
| March | 182 | 49 |
| April | 49 | 134 |
| May | 5 | 302 |
| June | 0 | 459 |
| July | 0 | 549 |
| August | 0 | 561 |
| September | 2 | 402 |
| October | 44 | 195 |
| November | 204 | 48 |
| December | 402 | 13 |
| Year (annual) | 1,635 | 2,735 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413183. 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 Flatonia been warmer than normal lately?
Over 72 complete years from 1908 to 2019, the station's annual mean temperature rose at a fitted 1.7°F per century (+0.09°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Flatonia's climate compare?
Flatonia is warmer than 218 of the other 320 places with their own NOAA record in Texas, and wetter than 215. Across the 7,247 U.S. stations with normals, its annual mean of 67.9°F is warmer than 93%.
In the Köppen classification computed from these normals, Flatonia 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 Flatonia share this climate record?
3 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.
- Schulenburg, TX2,839 people · 10 mi E
- Waelder, TX955 people · 15 mi W
- Moulton, TX858 people · 7 mi SW
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 Flatonia's climate
What is the coldest month in Flatonia?
January, with a normal high of 62°F and a normal low of 40°F. The warmest is August (95°F by day, 71°F at night).
Does it snow in Flatonia?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Flatonia?
May, with 4.43 in of precipitation in a normal year; the driest is July with 2.05 in.
What plant hardiness zone is Flatonia in?
The USDA's 2023 map puts Flatonia in zone 9a in ZIP code 78941, the nearest ZIP area. By the same method at Flatonia's NOAA station, the coldest night of a typical year reaches 24°F (23 years, 1991-2020): zone 9a.
How late can frost come in Flatonia?
In half of years the last 32°F night comes after March 2; in one year in ten it comes after March 21. Waiting until March 21 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Hallettsville, TX14 miles from this station, 71.7°F a year
- La Grange, TX22 miles from this station, 68.9°F a year
- Yoakum, TX25 miles from this station, 69.1°F a year
- Gonzales, TX25 miles from this station, 68.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made