Pool swim season in Jacksonville, NC
When can you swim in an outdoor pool in Jacksonville, NC?
An unheated pool in Jacksonville reaches 78°F in Jul to Sep, about 3 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 Jacksonville pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 3 | Jul 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 | $171 | $721 |
| Gas heater + cover | 7 | Apr to Oct | $375 | $800 |
For a 450 sq ft pool held at 80°F, at NC prices of 14.9¢/kWh electricity and $16/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Jacksonville
Solar panels + cover: 6 of 7 possible months for about $283 a year all-in, which works out near $94 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 a heat pump sized to your pool's surface area; here it beats gas all-in (heat pump or gas).
Weather station: NEW Rvr Mcaf, 3 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Jacksonville 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 | 56° | 46° | 2.7 | 47° | 53° | – | – |
| Feb | 59° | 48° | 3.4 | 47° | 53° | – | – |
| Mar | 66° | 55° | 4.6 | 53° | 59° | – | – |
| Apr | 74° | 63° | 5.8 | 62° | 68° | $111 | $238 |
| May | 80° | 70° | 6.3 | 70° | 76° | $32 | $76 |
| Jun | 87° | 78° | 6.5 | 77° | 83° | – | – |
| Jul | 89° | 81° | 6.3 | 83° | 89° | – | – |
| Aug | 88° | 80° | 5.6 | 83° | 89° | – | – |
| Sep | 83° | 75° | 4.7 | 79° | 85° | – | – |
| Oct | 75° | 65° | 3.9 | 71° | 77° | $28 | $61 |
| Nov | 66° | 55° | 3.0 | 60° | 66° | – | – |
| Dec | 59° | 49° | 2.4 | 51° | 57° | – | – |
Heating costs most in Apr (about $111 with a heat pump, $238 with gas). Sunshine peaks in Jun at 6.5 kWh/m²/day (NASA satellite data, 27.3 km grid cell). Highlighted months are swimmable with no heater.
How Jacksonville compares with nearby cities
Jacksonville ranks 7 of 91 North Carolina cities for unheated swim months; Wilmington nearby gets a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Havelock, NC | 31 mi | 3 | 7 | $163 |
| New Bern, NC | 31 mi | 3 | 7 | $205 |
| Kinston, NC | 39 mi | 3 | 7 | $176 |
| Wilmington, NC | 46 mi | 4 | 7 | $150 |
| Leland, NC | 51 mi | 3 | 7 | $156 |
| Winterville, NC | 55 mi | 2 | 7 | $215 |