Pool swim season in Salem, UT
Swim season in Salem without a heater, and with one
An unheated pool in Salem reaches 78°F in Aug, about 1 month a year. The air allows up to 5 swimmable months with a heater (May to Sep).
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Heater options for a Salem pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 1 | 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 | $161 | $711 |
| Gas heater + cover | 5 | May to Sep | $240 | $665 |
For a 450 sq ft pool held at 80°F, at UT prices of 13.2¢/kWh electricity and $10/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Salem
Solar panels + cover: 4 of 5 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 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: Spanish Fk Pwr House, 3.7 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Salem 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° | 30° | 2.3 | 30° | 36° | – | – |
| Feb | 45° | 35° | 3.2 | 33° | 39° | – | – |
| Mar | 57° | 45° | 4.5 | 42° | 48° | – | – |
| Apr | 64° | 51° | 5.6 | 51° | 57° | – | – |
| May | 74° | 60° | 6.6 | 59° | 65° | $121 | $176 |
| Jun | 86° | 70° | 7.8 | 70° | 76° | $32 | $52 |
| Jul | 93° | 77° | 7.5 | 78° | 84° | – | – |
| Aug | 91° | 75° | 6.6 | 80° | 86° | – | – |
| Sep | 81° | 66° | 5.4 | 73° | 79° | $8 | $12 |
| Oct | 67° | 54° | 3.8 | 61° | 67° | – | – |
| Nov | 51° | 41° | 2.5 | 47° | 53° | – | – |
| Dec | 38° | 31° | 1.9 | 35° | 41° | – | – |
Heating costs most in May (about $121 with a heat pump, $176 with gas). Sunshine peaks in Jun at 7.8 kWh/m²/day (NASA satellite data, 51.4 km grid cell). Highlighted months are swimmable with no heater.
How Salem compares with nearby cities
Salem ranks 46 of 67 Utah cities for unheated swim months; Springville, Provo nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Payson, UT | 4 mi | 1 | 4 | $69 |
| Spanish Fork, UT | 4 mi | 1 | 5 | $161 |
| Mapleton, UT | 7 mi | 1 | 5 | $161 |
| Springville, UT | 8 mi | 2 | 5 | $126 |
| Santaquin, UT | 9 mi | 1 | 4 | $67 |
| Provo, UT | 13 mi | 2 | 5 | $126 |