Pool swim season in Belton, TX
Belton, TX: how long the pool season really is
An unheated pool in Belton reaches 78°F in Jun to Sep, about 4 months a year. The air allows up to 8 swimmable months with a heater (Mar to Oct).
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What each heater buys you in Belton
| 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 | 7 | Apr to Oct | $0 | $283 |
| Heat pump + cover | 8 | Mar to Oct | $275 | $825 |
| Gas heater + cover | 8 | Mar to Oct | $636 | $1,061 |
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 Belton
Solar panels + cover: 7 of 8 possible months for about $283 a year all-in, which works out near $94 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: Stillhouse Hollow Dam, 3.1 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Belton 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 | 60° | 48° | 3.0 | 49° | 55° | – | – |
| Feb | 64° | 52° | 3.5 | 50° | 56° | – | – |
| Mar | 71° | 58° | 4.5 | 57° | 63° | $178 | $393 |
| Apr | 78° | 66° | 5.5 | 65° | 71° | $86 | $212 |
| May | 85° | 74° | 5.9 | 73° | 79° | $11 | $31 |
| Jun | 91° | 80° | 6.8 | 81° | 87° | – | – |
| Jul | 95° | 84° | 6.8 | 86° | 92° | – | – |
| Aug | 96° | 84° | 6.3 | 87° | 93° | – | – |
| Sep | 90° | 78° | 5.2 | 83° | 89° | – | – |
| Oct | 81° | 68° | 4.2 | 74° | 80° | – | – |
| Nov | 69° | 58° | 3.2 | 63° | 69° | – | – |
| Dec | 61° | 50° | 2.7 | 53° | 59° | – | – |
Heating costs most in Mar (about $178 with a heat pump, $393 with gas). Sunshine peaks in Jul at 6.8 kWh/m²/day (NASA satellite data, 49.8 km grid cell). Highlighted months are swimmable with no heater.
How Belton compares with nearby cities
Belton ranks 169 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 |
|---|---|---|---|---|
| Temple, TX | 6 mi | 4 | 8 | $275 |
| Harker Heights, TX | 10 mi | 4 | 7 | $104 |
| Killeen, TX | 15 mi | 4 | 7 | $104 |
| Copperas Cove, TX | 26 mi | 4 | 7 | $104 |
| Georgetown, TX | 30 mi | 4 | 8 | $252 |
| Gatesville, TX | 31 mi | 4 | 8 | $265 |