Pool swim season in Germantown, TN
Germantown, TN: how long the pool season really is
An unheated pool in Germantown reaches 78°F in Jun to Sep, about 4 months a year. The air allows up to 7 swimmable months with a heater (Apr to Oct).
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Heater options for a Germantown pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 4 | Jun to Sep | $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 | $185 | $735 |
| Gas heater + cover | 7 | Apr to Oct | $315 | $740 |
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 Germantown
Solar panels + cover: 6 of 7 possible months for about $283 a year all-in, which works out near $142 for each month it adds.
A solar cover alone adds no swim months here, so if you want a longer season you need a heater (why); still use one at night to hold the heat you pay for. 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: Germantown 4SE, 2.3 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Germantown 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 | 50° | 41° | 2.4 | 42° | 48° | – | – |
| Feb | 55° | 45° | 3.0 | 43° | 49° | – | – |
| Mar | 64° | 53° | 4.1 | 50° | 56° | – | – |
| Apr | 74° | 62° | 5.3 | 60° | 66° | $115 | $191 |
| May | 82° | 71° | 6.0 | 70° | 76° | $32 | $60 |
| Jun | 89° | 79° | 6.6 | 79° | 85° | – | – |
| Jul | 92° | 82° | 6.3 | 84° | 90° | – | – |
| Aug | 91° | 81° | 5.8 | 85° | 91° | – | – |
| Sep | 85° | 74° | 4.9 | 80° | 86° | – | – |
| Oct | 75° | 63° | 3.8 | 69° | 75° | $38 | $64 |
| Nov | 63° | 52° | 2.8 | 57° | 63° | – | – |
| Dec | 53° | 44° | 2.1 | 47° | 53° | – | – |
Heating costs most in Apr (about $115 with a heat pump, $191 with gas). Sunshine peaks in Jun at 6.6 kWh/m²/day (NASA satellite data, 53.1 km grid cell). Highlighted months are swimmable with no heater.
How Germantown compares with nearby cities
Germantown ranks 2 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 |
|---|---|---|---|---|
| Collierville, TN | 5 mi | 3 | 7 | $216 |
| Olive Branch, MS | 9 mi | 4 | 7 | $216 |
| Memphis, TN | 11 mi | 4 | 7 | $154 |
| Bartlett, TN | 11 mi | 3 | 7 | $217 |
| Lakeland, TN | 13 mi | 3 | 7 | $217 |
| Arlington, TN | 14 mi | 3 | 7 | $217 |