Pool swim season in La Marque, TX
Swim season in La Marque without a heater, and with one
An unheated pool in La Marque reaches 78°F in Jun to Sep, about 4 months a year. The air allows up to 9 swimmable months with a heater (Mar to Nov).
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What each heater buys you in La Marque
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 4 | Jun to Sep | $0 | $0 |
| Solar cover only | 6 | May to Oct | $0 | $50 |
| Solar panels + cover | 8 | Apr to Nov | $0 | $283 |
| Heat pump + cover | 9 | Mar to Nov | $199 | $749 |
| Gas heater + cover | 9 | Mar to Nov | $484 | $909 |
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 La Marque
Solar panels + cover: 8 of 9 possible months for about $283 a year all-in, which works out near $71 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: Houston Nwso, 8.9 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
La Marque 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 | 64° | 55° | 2.9 | 56° | 62° | – | – |
| Feb | 67° | 59° | 3.3 | 57° | 63° | – | – |
| Mar | 73° | 64° | 4.6 | 63° | 69° | $102 | $247 |
| Apr | 78° | 70° | 5.5 | 70° | 76° | $39 | $100 |
| May | 85° | 77° | 6.3 | 77° | 83° | – | – |
| Jun | 90° | 82° | 6.5 | 83° | 89° | – | – |
| Jul | 92° | 84° | 6.2 | 86° | 92° | – | – |
| Aug | 92° | 84° | 5.8 | 87° | 93° | – | – |
| Sep | 88° | 80° | 5.0 | 84° | 90° | – | – |
| Oct | 82° | 72° | 4.4 | 78° | 84° | – | – |
| Nov | 73° | 63° | 3.4 | 68° | 74° | $58 | $137 |
| Dec | 66° | 57° | 2.6 | 59° | 65° | – | – |
Heating costs most in Mar (about $102 with a heat pump, $247 with gas). Sunshine peaks in Jun at 6.5 kWh/m²/day (NASA satellite data, 50.0 km grid cell). Highlighted months are swimmable with no heater.
How La Marque compares with nearby cities
La Marque ranks 182 of 252 Texas cities for unheated swim months; Texas City, Galveston nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Santa Fe, TX | 7 mi | 4 | 9 | $203 |
| Dickinson, TX | 7 mi | 4 | 9 | $203 |
| Texas City, TX | 8 mi | 5 | 9 | $180 |
| League City, TX | 11 mi | 4 | 9 | $203 |
| Galveston, TX | 13 mi | 6 | 9 | $150 |
| Webster, TX | 13 mi | 4 | 9 | $203 |