Pool swim season in Jasper, IN
Swim season in Jasper without a heater, and with one
An unheated pool in Jasper reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 6 swimmable months with a heater (May to Oct).
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What each heater buys you in Jasper
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 2 | Jul to Aug | $0 | $0 |
| Solar cover only | 4 | Jun to Sep | $0 | $50 |
| Solar panels + cover | 5 | May to Sep | $0 | $283 |
| Heat pump + cover | 6 | May to Oct | $185 | $735 |
| Gas heater + cover | 6 | May to Oct | $246 | $671 |
For a 450 sq ft pool held at 80°F, at IN prices of 17.0¢/kWh electricity and $11/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Jasper
Solar panels + cover: 5 of 6 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 gas as well as a heat pump: once the purchase price is counted, gas comes out cheaper all-in here (heat pump or gas).
Weather station: Patoka Lake, 13.2 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Jasper 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 | 42° | 33° | 1.9 | 34° | 40° | – | – |
| Feb | 47° | 36° | 2.6 | 34° | 40° | – | – |
| Mar | 57° | 45° | 3.7 | 41° | 47° | – | – |
| Apr | 69° | 56° | 4.9 | 52° | 58° | – | – |
| May | 78° | 67° | 5.5 | 64° | 70° | $98 | $136 |
| Jun | 87° | 75° | 6.3 | 74° | 80° | – | – |
| Jul | 92° | 80° | 6.1 | 81° | 87° | – | – |
| Aug | 90° | 77° | 5.6 | 81° | 87° | – | – |
| Sep | 83° | 71° | 4.6 | 76° | 82° | – | – |
| Oct | 73° | 60° | 3.3 | 66° | 72° | $87 | $110 |
| Nov | 58° | 47° | 2.3 | 53° | 59° | – | – |
| Dec | 47° | 38° | 1.7 | 41° | 47° | – | – |
Heating costs most in May (about $98 with a heat pump, $136 with gas). Sunshine peaks in Jun at 6.3 kWh/m²/day (NASA satellite data, 40.2 km grid cell). Highlighted months are swimmable with no heater.
How Jasper compares with nearby cities
Jasper ranks 6 of 88 Indiana cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Washington, IN | 22 mi | 2 | 5 | $93 |
| Vincennes, IN | 36 mi | 2 | 6 | $215 |
| Bedford, IN | 40 mi | 0 | 5 | $199 |
| Evansville, IN | 43 mi | 2 | 6 | $136 |
| Owensboro, KY | 45 mi | 2 | 6 | $153 |
| Henderson, KY | 52 mi | 2 | 6 | $161 |