Pool swim season in Lake Grove, NY
Swim season in Lake Grove without a heater, and with one
An unheated pool in Lake Grove never reaches 78°F in a normal year. It peaks around 77°F in Aug. The air allows up to 4 swimmable months with a heater (Jun to Sep).
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What each heater buys you in Lake Grove
| 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 | 4 | Jun to Sep | $143 | $693 |
| Gas heater + cover | 4 | Jun to Sep | $181 | $606 |
For a 450 sq ft pool held at 80°F, at NY prices of 29.3¢/kWh electricity and $18/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Lake Grove
Solar panels + cover: 4 of 4 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: Islip-Li Macarthur Airport, 4.5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Lake Grove 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 | 39° | 32° | 1.9 | 33° | 39° | – | – |
| Feb | 41° | 33° | 2.8 | 32° | 38° | – | – |
| Mar | 48° | 40° | 3.8 | 37° | 43° | – | – |
| Apr | 58° | 50° | 5.0 | 47° | 53° | – | – |
| May | 68° | 60° | 5.6 | 57° | 63° | – | – |
| Jun | 77° | 69° | 6.1 | 67° | 73° | $106 | $135 |
| Jul | 83° | 75° | 6.2 | 75° | 81° | – | – |
| Aug | 81° | 74° | 5.5 | 77° | 83° | – | – |
| Sep | 75° | 67° | 4.4 | 72° | 78° | $37 | $46 |
| Oct | 64° | 56° | 3.0 | 61° | 67° | – | – |
| Nov | 54° | 46° | 2.1 | 50° | 56° | – | – |
| Dec | 44° | 37° | 1.6 | 40° | 46° | – | – |
Heating costs most in Jun (about $106 with a heat pump, $135 with gas). Sunshine peaks in Jul at 6.2 kWh/m²/day (NASA satellite data, 51.3 km grid cell). Highlighted months are swimmable with no heater.
How Lake Grove compares with nearby cities
Lake Grove ranks 16 of 90 New York cities for unheated swim months; Massapequa Park nearby gets a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Patchogue, NY | 8 mi | 0 | 4 | $154 |
| Babylon, NY | 16 mi | 0 | 4 | $135 |
| Lindenhurst, NY | 18 mi | 0 | 4 | $135 |
| Massapequa Park, NY | 21 mi | 1 | 4 | $78 |
| Norwalk, CT | 23 mi | 0 | 5 | $398 |
| Bridgeport, CT | 23 mi | 0 | 4 | $119 |