Pool swim season in Shelbyville, KY
When can you swim in an outdoor pool in Shelbyville, KY?
An unheated pool in Shelbyville never reaches 78°F in a normal year. It peaks around 76°F in Jul. The air allows up to 5 swimmable months with a heater (May to Sep).
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Heater options for a Shelbyville pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 2 | Jul to Aug | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 5 | May to Sep | $164 | $714 |
| Gas heater + cover | 5 | May to Sep | $331 | $756 |
For a 450 sq ft pool held at 80°F, at KY prices of 14.2¢/kWh electricity and $14/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Shelbyville
Solar panels + cover: 4 of 5 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: Shelbyville 1 E, 1.9 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Shelbyville 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° | 31° | 1.9 | 32° | 38° | – | – |
| Feb | 47° | 34° | 2.6 | 32° | 38° | – | – |
| Mar | 57° | 43° | 3.7 | 39° | 45° | – | – |
| Apr | 68° | 53° | 5.0 | 50° | 56° | – | – |
| May | 77° | 63° | 5.5 | 60° | 66° | $114 | $224 |
| Jun | 85° | 72° | 6.3 | 71° | 77° | $24 | $54 |
| Jul | 88° | 75° | 6.0 | 76° | 82° | – | – |
| Aug | 87° | 73° | 5.5 | 76° | 82° | – | – |
| Sep | 81° | 66° | 4.6 | 71° | 77° | $26 | $53 |
| Oct | 69° | 55° | 3.3 | 61° | 67° | – | – |
| Nov | 57° | 43° | 2.3 | 48° | 54° | – | – |
| Dec | 46° | 35° | 1.7 | 38° | 44° | – | – |
Heating costs most in May (about $114 with a heat pump, $224 with gas). Sunshine peaks in Jun at 6.3 kWh/m²/day (NASA satellite data, 40.1 km grid cell). Highlighted months are swimmable with no heater.
How Shelbyville compares with nearby cities
Shelbyville ranks 42 of 42 Kentucky cities for unheated swim months; La Grange, Jeffersontown, Lyndon nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| La Grange, KY | 15 mi | 2 | 5 | $103 |
| Jeffersontown, KY | 18 mi | 2 | 5 | $70 |
| Lyndon, KY | 20 mi | 2 | 5 | $70 |
| Frankfort, KY | 20 mi | 2 | 5 | $92 |
| Mount Washington, KY | 21 mi | 2 | 5 | $81 |
| Lawrenceburg, KY | 21 mi | 0 | 5 | $130 |