Pool swim season in Winchester, TN
Swim season in Winchester without a heater, and with one
An unheated pool in Winchester reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 7 swimmable months with a heater (Apr to Oct).
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What each heater buys you in Winchester
| 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 | 6 | May to Oct | $0 | $283 |
| Heat pump + cover | 7 | Apr to Oct | $273 | $823 |
| Gas heater + cover | 7 | Apr to Oct | $446 | $871 |
For a 450 sq ft pool held at 80°F, at TN prices of 13.8¢/kWh electricity and $12/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Winchester
Solar panels + cover: 6 of 7 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: Winchester 5SE, 4.8 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Winchester 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 | 49° | 40° | 2.3 | 40° | 46° | – | – |
| Feb | 53° | 43° | 2.9 | 41° | 47° | – | – |
| Mar | 61° | 51° | 4.0 | 48° | 54° | – | – |
| Apr | 71° | 59° | 5.3 | 57° | 63° | $146 | $231 |
| May | 78° | 67° | 5.9 | 66° | 72° | $62 | $110 |
| Jun | 85° | 74° | 6.4 | 74° | 80° | – | – |
| Jul | 87° | 78° | 6.1 | 79° | 85° | – | – |
| Aug | 87° | 77° | 5.6 | 80° | 86° | – | – |
| Sep | 82° | 71° | 4.8 | 76° | 82° | – | – |
| Oct | 72° | 60° | 3.7 | 66° | 72° | $65 | $105 |
| Nov | 61° | 49° | 2.8 | 55° | 61° | – | – |
| Dec | 52° | 42° | 2.0 | 45° | 51° | – | – |
Heating costs most in Apr (about $146 with a heat pump, $231 with gas). Sunshine peaks in Jun at 6.4 kWh/m²/day (NASA satellite data, 49.5 km grid cell). Highlighted months are swimmable with no heater.
How Winchester compares with nearby cities
Winchester ranks 48 of 65 Tennessee cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Tullahoma, TN | 14 mi | 2 | 7 | $293 |
| Manchester, TN | 19 mi | 0 | 6 | $200 |
| Shelbyville, TN | 29 mi | 2 | 7 | $260 |
| Scottsboro, AL | 38 mi | 2 | 7 | $309 |
| McMinnville, TN | 39 mi | 2 | 7 | $244 |
| Lewisburg, TN | 43 mi | 2 | 7 | $286 |