Pool swim season in Morristown, TN

Morristown, TN: how long the pool season really is

An unheated pool in Morristown reaches 78°F in Aug, about 1 month a year. The air allows up to 6 swimmable months with a heater (May to Oct).

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2. F
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11. N
12. D

Heater options for a Morristown pool, side by side

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 Morristown

Solar panels + cover: 5 of 6 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 3 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: Morristown Radio Wcrk, 1.8 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.

Morristown month by month: air, sun and pool water

Heating costs most in Oct (about $82 with a heat pump, $128 with gas). Sunshine peaks in Jun at 6.2 kWh/m²/day (NASA satellite data, 37.4 km grid cell). Highlighted months are swimmable with no heater.

How Morristown compares with nearby cities

Morristown ranks 58 of 65 Tennessee cities for unheated swim months; Sevierville, Knoxville, Alcoa nearby get a longer season without a heater.