Pool swim season in Cullman, AL
Cullman, AL: how long the pool season really is
An unheated pool in Cullman 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 Cullman 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 | $245 | $795 |
| Gas heater + cover | 7 | Apr to Oct | $511 | $936 |
For a 450 sq ft pool held at 80°F, at AL prices of 16.5¢/kWh electricity and $18/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Cullman
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: Saint Bernard, 1.6 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Cullman 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 | 52° | 42° | 2.5 | 43° | 49° | – | – |
| Feb | 57° | 46° | 3.0 | 44° | 50° | – | – |
| Mar | 65° | 53° | 4.2 | 51° | 57° | – | – |
| Apr | 74° | 62° | 5.5 | 60° | 66° | $140 | $286 |
| May | 81° | 69° | 6.0 | 68° | 74° | $52 | $116 |
| Jun | 87° | 76° | 6.3 | 76° | 82° | – | – |
| Jul | 90° | 79° | 6.1 | 81° | 87° | – | – |
| Aug | 90° | 79° | 5.6 | 82° | 88° | – | – |
| Sep | 85° | 73° | 4.9 | 78° | 84° | – | – |
| Oct | 75° | 62° | 3.9 | 69° | 75° | $53 | $109 |
| Nov | 63° | 51° | 2.9 | 57° | 63° | – | – |
| Dec | 55° | 44° | 2.2 | 47° | 53° | – | – |
Heating costs most in Apr (about $140 with a heat pump, $286 with gas). Sunshine peaks in Jun at 6.3 kWh/m²/day (NASA satellite data, 47.6 km grid cell). Highlighted months are swimmable with no heater.
How Cullman compares with nearby cities
Cullman ranks 49 of 66 Alabama cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Hartselle, AL | 19 mi | 2 | 7 | $245 |
| Decatur, AL | 29 mi | 2 | 7 | $245 |
| Jasper, AL | 33 mi | 3 | 7 | $260 |
| Gardendale, AL | 35 mi | 2 | 7 | $244 |
| Clay, AL | 36 mi | 2 | 7 | $244 |
| Albertville, AL | 36 mi | 3 | 7 | $243 |