Pool swim season in Mount Washington, KY

Mount Washington, KY: how long the pool season really is

An unheated pool in Mount Washington reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 5 swimmable months with a heater (May to Sep).

1. J
2. F
3. M
4. A
5. M
6. J
7. J
8. A
9. S
10. O
11. N
12. D

What each heater buys you in Mount Washington

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 Mount Washington

Solar cover only: 4 of 5 possible months for about $50 a year all-in, which works out near $25 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: Louisville NWS Office, 6.9 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.

Mount Washington month by month: air, sun and pool water

Heating costs most in May (about $78 with a heat pump, $160 with gas). Sunshine peaks in Jun at 6.3 kWh/m²/day (NASA satellite data, 51.1 km grid cell). Highlighted months are swimmable with no heater.

How Mount Washington compares with nearby cities

Mount Washington ranks 13 of 42 Kentucky cities for unheated swim months, and no nearby city gets a longer unheated season.