Pool swim season in Brownsville, TX
Brownsville, TX: how long the pool season really is
An unheated pool in Brownsville reaches 78°F in May to Oct, about 6 months a year. The air allows up to 12 swimmable months with a heater (all year).
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Heater options for a Brownsville pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 6 | May to Oct | $0 | $0 |
| Solar cover only | 8 | Apr to Nov | $0 | $50 |
| Solar panels + cover | 10 | Mar to Dec | $0 | $283 |
| Heat pump + cover | 12 | all year | $264 | $814 |
| Gas heater + cover | 12 | all year | $644 | $1,069 |
For a 450 sq ft pool held at 80°F, at TX prices of 16.0¢/kWh electricity and $19/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Brownsville
Heat pump + cover: 12 of 12 possible months for about $814 a year all-in, which works out near $136 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 2 months here for about $50 a year (why a cover comes first). If you get quotes, ask for a heat pump sized to your pool's surface area; here it beats gas all-in (heat pump or gas).
Weather station: Brownsville, 6.4 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Brownsville month by month: air, sun and pool water
| Month | Air high | Air avg | Sun kWh/m²/day | Water, unheated | Water, covered | Heat pump $ | Gas $ |
|---|---|---|---|---|---|---|---|
| Jan | 73° | 63° | 3.2 | 64° | 70° | $97 | $230 |
| Feb | 76° | 67° | 3.9 | 66° | 72° | $77 | $191 |
| Mar | 81° | 71° | 4.8 | 71° | 77° | $29 | $75 |
| Apr | 86° | 77° | 5.6 | 77° | 83° | – | – |
| May | 90° | 82° | 6.2 | 83° | 89° | – | – |
| Jun | 94° | 86° | 6.6 | 87° | 93° | – | – |
| Jul | 95° | 86° | 6.5 | 90° | 96° | – | – |
| Aug | 96° | 87° | 6.3 | 90° | 96° | – | – |
| Sep | 92° | 83° | 5.3 | 88° | 94° | – | – |
| Oct | 87° | 78° | 4.7 | 82° | 88° | – | – |
| Nov | 80° | 71° | 3.6 | 75° | 81° | – | – |
| Dec | 74° | 64° | 3.0 | 67° | 73° | $61 | $148 |
Heating costs most in Jan (about $97 with a heat pump, $230 with gas). Sunshine peaks in Jun at 6.6 kWh/m²/day (NASA satellite data, 54.5 km grid cell). Highlighted months are swimmable with no heater.
How Brownsville compares with nearby cities
Brownsville ranks 16 of 252 Texas cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| San Benito, TX | 14 mi | 6 | 12 | $323 |
| Harlingen, TX | 19 mi | 6 | 12 | $323 |
| Mercedes, TX | 29 mi | 6 | 12 | $356 |
| Weslaco, TX | 34 mi | 6 | 12 | $356 |
| Donna, TX | 37 mi | 6 | 12 | $349 |
| Raymondville, TX | 38 mi | 6 | 12 | $398 |