Pool swim season in Suffern, NY
Swim season in Suffern without a heater, and with one
An unheated pool in Suffern 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 Suffern
| 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 | $470 | $1,020 |
| Gas heater + cover | 5 | May to Sep | $550 | $975 |
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 Suffern
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: Wanaque Raymond Dam, 9.2 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Suffern 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 | 38° | 29° | 1.8 | 31° | 37° | – | – |
| Feb | 41° | 30° | 2.6 | 29° | 35° | – | – |
| Mar | 48° | 38° | 3.6 | 35° | 41° | – | – |
| Apr | 60° | 49° | 4.6 | 46° | 52° | – | – |
| May | 71° | 60° | 5.3 | 57° | 63° | $306 | $346 |
| Jun | 79° | 69° | 5.8 | 67° | 73° | $108 | $136 |
| Jul | 84° | 74° | 5.9 | 75° | 81° | – | – |
| Aug | 83° | 73° | 5.1 | 76° | 82° | – | – |
| Sep | 76° | 66° | 4.2 | 71° | 77° | $56 | $68 |
| Oct | 64° | 54° | 2.8 | 60° | 66° | – | – |
| Nov | 53° | 44° | 2.0 | 48° | 54° | – | – |
| Dec | 43° | 35° | 1.4 | 38° | 44° | – | – |
Heating costs most in May (about $306 with a heat pump, $346 with gas). Sunshine peaks in Jul at 5.9 kWh/m²/day (NASA satellite data, 52.5 km grid cell). Highlighted months are swimmable with no heater.
How Suffern compares with nearby cities
Suffern ranks 38 of 90 New York cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Airmont, NY | 2 mi | 0 | 5 | $470 |
| Ramsey, NJ | 4 mi | 0 | 5 | $387 |
| Spring Valley, NY | 5 mi | 0 | 5 | $410 |
| Chestnut Ridge, NY | 5 mi | 0 | 5 | $410 |
| Ringwood, NJ | 7 mi | 0 | 5 | $387 |
| Waldwick, NJ | 7 mi | 0 | 5 | $387 |