Pool swim season in Kearny, NJ
Kearny, NJ: how long the pool season really is
An unheated pool in Kearny reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 5 swimmable months with a heater (May to Sep).
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What each heater buys you in Kearny
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 2 | Jul to Aug | $0 | $0 |
| Solar cover only | 3 | Jul to Sep | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 5 | May to Sep | $250 | $800 |
| Gas heater + cover | 5 | May to Sep | $295 | $720 |
For a 450 sq ft pool held at 80°F, at NJ prices of 24.1¢/kWh electricity and $14/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Kearny
Solar panels + cover: 4 of 5 possible months for about $283 a year all-in, which works out near $142 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 1 month 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: Harrison, 1.5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Kearny 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 | 34° | 40° | – | – |
| Feb | 42° | 34° | 2.8 | 33° | 39° | – | – |
| Mar | 50° | 41° | 3.7 | 39° | 45° | – | – |
| Apr | 62° | 52° | 4.9 | 49° | 55° | – | – |
| May | 72° | 63° | 5.4 | 60° | 66° | $201 | $231 |
| Jun | 82° | 72° | 6.0 | 71° | 77° | $44 | $57 |
| Jul | 87° | 78° | 6.0 | 78° | 84° | – | – |
| Aug | 85° | 76° | 5.2 | 79° | 85° | – | – |
| Sep | 78° | 69° | 4.3 | 74° | 80° | $5 | $7 |
| Oct | 66° | 57° | 3.0 | 63° | 69° | – | – |
| Nov | 54° | 46° | 2.2 | 51° | 57° | – | – |
| Dec | 44° | 37° | 1.6 | 40° | 46° | – | – |
Heating costs most in May (about $201 with a heat pump, $231 with gas). Sunshine peaks in Jul at 6.0 kWh/m²/day (NASA satellite data, 42.4 km grid cell). Highlighted months are swimmable with no heater.
How Kearny compares with nearby cities
Kearny ranks 41 of 116 New Jersey cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Harrison, NJ | 2 mi | 2 | 5 | $250 |
| North Arlington, NJ | 2 mi | 2 | 5 | $250 |
| Newark, NJ | 3 mi | 2 | 5 | $250 |
| Secaucus, NJ | 4 mi | 2 | 5 | $250 |
| Jersey City, NJ | 4 mi | 2 | 5 | $250 |
| East Orange, NJ | 5 mi | 2 | 5 | $250 |