Pool swim season in Chambersburg, PA
When can you swim in an outdoor pool in Chambersburg, PA?
An unheated pool in Chambersburg never reaches 78°F in a normal year. It peaks around 76°F in Aug. The air allows up to 5 swimmable months with a heater (May to Sep).
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What each heater buys you in Chambersburg
| 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 | $274 | $824 |
| Gas heater + cover | 5 | May to Sep | $388 | $813 |
For a 450 sq ft pool held at 80°F, at PA prices of 21.1¢/kWh electricity and $15/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Chambersburg
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 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: Chambersburg 1 ESE, 0.9 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Chambersburg 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 | 37° | 30° | 2.0 | 31° | 37° | – | – |
| Feb | 41° | 33° | 2.8 | 31° | 37° | – | – |
| Mar | 50° | 41° | 3.8 | 38° | 44° | – | – |
| Apr | 63° | 52° | 4.9 | 49° | 55° | – | – |
| May | 73° | 62° | 5.4 | 60° | 66° | $182 | $250 |
| Jun | 81° | 71° | 6.1 | 70° | 76° | $51 | $79 |
| Jul | 85° | 75° | 6.0 | 76° | 82° | – | – |
| Aug | 83° | 73° | 5.3 | 76° | 82° | – | – |
| Sep | 76° | 66° | 4.3 | 71° | 77° | $41 | $59 |
| Oct | 64° | 54° | 3.1 | 60° | 66° | – | – |
| Nov | 52° | 44° | 2.3 | 48° | 54° | – | – |
| Dec | 41° | 34° | 1.7 | 38° | 44° | – | – |
Heating costs most in May (about $182 with a heat pump, $250 with gas). Sunshine peaks in Jun at 6.1 kWh/m²/day (NASA satellite data, 49.8 km grid cell). Highlighted months are swimmable with no heater.
How Chambersburg compares with nearby cities
Chambersburg ranks 23 of 68 Pennsylvania cities for unheated swim months; Frederick nearby gets a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Waynesboro, PA | 13 mi | 0 | 5 | $313 |
| Hagerstown, MD | 21 mi | 0 | 5 | $221 |
| Carlisle, PA | 30 mi | 0 | 5 | $325 |
| Frederick, MD | 37 mi | 2 | 5 | $131 |
| Hanover, PA | 37 mi | 0 | 5 | $296 |
| Martinsburg, WV | 37 mi | 0 | 5 | $181 |