Port O'Connor, Texas climate: Normal weather by month, frost dates and records
Port O'Connor's normal year runs from 47°F January nights to 90°F August afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 21.9°C, January lows of 8°C, August highs of 32°C.
- NOAA stationPort O'connor
- Station IDUSC00417186
- Location28.43°N 96.43°W
- Elevation5 ft (2 m)
- Population (census place)698
On October 23, the normal high in Port O'Connor is 82°F and the normal low 65°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Port O'Connor.
- Jan 65° 47°
- Feb 67° 50°
- Mar 72° 57°
- Apr 77° 64°
- May 82° 72°
- Jun 87° 77°
- Jul 89° 79°
- Aug 90° 79°
- Sep 88° 76°
- Oct 84° 68°
- Nov 75° 55°
- Dec 68° 49°
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 Port O'Connor each month?
August is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 47°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 65°F | 47°F | 55.7°F | – | <1 | 1 | 10 h 30 min |
| February | 67°F | 50°F | 58.6°F | – | <1 | 1 | 11 h 10 min |
| March | 72°F | 57°F | 64.5°F | – | <1 | <1 | 12 h |
| April | 77°F | 64°F | 70.5°F | – | <1 | <1 | 12 h 50 min |
| May | 82°F | 72°F | 77.1°F | – | 2 | <1 | 13 h 30 min |
| June | 87°F | 77°F | 82.3°F | – | 8 | <1 | 14 h |
| July | 89°F | 79°F | 83.8°F | – | 11 | <1 | 13 h 50 min |
| August | 90°F | 79°F | 84.6°F | – | 20 | <1 | 13 h 10 min |
| September | 88°F | 76°F | 81.9°F | – | 12 | <1 | 12 h 20 min |
| October | 84°F | 68°F | 75.5°F | – | 4 | <1 | 11 h 30 min |
| November | 75°F | 55°F | 65.0°F | – | <1 | <1 | 10 h 50 min |
| December | 68°F | 49°F | 58.5°F | – | <1 | 1 | 10 h 20 min |
| Year (annual) | 79°F | 64°F | 71.5°F | – | 57 | 4 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 18°C | 8°C | 13.2°C |
| February | 19°C | 10°C | 14.8°C |
| March | 22°C | 14°C | 18.1°C |
| April | 25°C | 18°C | 21.4°C |
| May | 28°C | 22°C | 25.1°C |
| June | 31°C | 25°C | 27.9°C |
| July | 32°C | 26°C | 28.8°C |
| August | 32°C | 26°C | 29.2°C |
| September | 31°C | 24°C | 27.7°C |
| October | 29°C | 20°C | 24.2°C |
| November | 24°C | 13°C | 18.3°C |
| December | 20°C | 9°C | 14.7°C |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00417186; 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 Port O'Connor?
Normal highs sit between 65°F and 85°F in February, March, April, May, October, November and December.
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 USC00417186.
When is the last frost in Port O'Connor?
In Port O'Connor, the last spring frost (32°F) comes after February 4 in half of years and after March 6 in one year in ten; the first autumn frost comes before December 27 in half of years and before November 20 in one year in ten. A night at 32°F or colder comes at all in 88% of years here (NOAA).
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- February 41 year in 10 after March 6; 9 in 10 after December 29
- First autumn frost, half of years before
- December 271 year in 10 before November 20; 9 in 10 before February 4
NOAA puts the median frost-free season at 323 days, and the season without a hard freeze (28°F) at 364 days.
A hard freeze (28°F) comes after January 27 in half of springs and before January 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Port O'Connor in zone 9b in ZIP code 77982, 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 USC00417186; 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 Port O'Connor?
In a normal year in Port O'Connor, 57 days a year reach 90°F (3 of them 100°F or more) and 4 nights fall to 32°F or colder.
- Days at 90°F or more
- 57a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 4a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
The highest temperature in this station's record (since 1948) is 109°F, on September 14, 2008; the lowest is 10°F, on December 23, 1989.
The wettest calendar year on that record is 1979, with 64.81 in; the snowiest season is 1972–73, with 1.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00417186; records: ACIS (NOAA Regional Climate Centers), station USC00417186. Records use complete months only; a month missing more than three days is left out.
How sunny is Port O'Connor?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Port O'Connor, 4.9 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 | 70% | 3.0 |
| February | 68% | 3.5 |
| March | 73% | 4.6 |
| April | 76% | 5.5 |
| May | 82% | 6.2 |
| June | 86% | 6.7 |
| July | 86% | 6.5 |
| August | 87% | 6.3 |
| September | 82% | 5.2 |
| October | 84% | 4.6 |
| November | 79% | 3.5 |
| 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 Port O'Connor need?
A normal year in Port O'Connor brings 908 heating degree days, 83% fewer than the median U.S. place (5,373), and 3,301 cooling degree days, 3.6 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 7,934 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 292 | 5 |
| February | 194 | 14 |
| March | 87 | 71 |
| April | 16 | 181 |
| May | 1 | 374 |
| June | 0 | 519 |
| July | 0 | 581 |
| August | 0 | 609 |
| September | 0 | 507 |
| October | 5 | 330 |
| November | 87 | 85 |
| December | 227 | 24 |
| Year (annual) | 908 | 3,301 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00417186. 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 Port O'Connor's climate compare?
Port O'Connor is warmer than 282 of the other 320 places with their own NOAA record in Texas. Across the 7,247 U.S. stations with normals, its annual mean of 71.5°F is warmer than 96%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Questions about Port O'Connor's climate
What is the coldest month in Port O'Connor?
January, with a normal high of 65°F and a normal low of 47°F. The warmest is August (90°F by day, 79°F at night).
What plant hardiness zone is Port O'Connor in?
The USDA's 2023 map puts Port O'Connor in zone 9b in ZIP code 77982, the nearest ZIP area.
How late can frost come in Port O'Connor?
In half of years the last 32°F night comes after February 4; in one year in ten it comes after March 6. Waiting until March 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Point Comfort, TX17 miles from this station, 71.3°F a year
- Palacios, TX23 miles from this station, 71.8°F a year
- Aransas Wildlife Refuge, TX24 miles from this station, 70.2°F a year
- Austwell, TX25 miles from this station, 70.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made