Pool swim season in Smithfield, UT
Smithfield, UT: how long the pool season really is
An unheated pool in Smithfield never reaches 78°F in a normal year. It peaks around 76°F in Aug. The air allows up to 4 swimmable months with a heater (Jun to Sep).
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What each heater buys you in Smithfield
| 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 | 4 | Jun to Sep | $125 | $675 |
| Gas heater + cover | 4 | Jun to Sep | $189 | $614 |
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 Smithfield
Solar panels + cover: 4 of 4 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: Logan Cache Airport, 3.6 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Smithfield 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 | 32° | 24° | 2.2 | 24° | 30° | – | – |
| Feb | 37° | 28° | 3.1 | 26° | 32° | – | – |
| Mar | 50° | 40° | 4.4 | 35° | 41° | – | – |
| Apr | 60° | 47° | 5.5 | 46° | 52° | – | – |
| May | 69° | 55° | 6.5 | 55° | 61° | – | – |
| Jun | 81° | 64° | 7.8 | 65° | 71° | $74 | $112 |
| Jul | 91° | 73° | 7.7 | 73° | 79° | $6 | $10 |
| Aug | 89° | 71° | 6.7 | 76° | 82° | – | – |
| Sep | 78° | 61° | 5.4 | 68° | 74° | $45 | $67 |
| Oct | 63° | 48° | 3.7 | 55° | 61° | – | – |
| Nov | 47° | 36° | 2.3 | 42° | 48° | – | – |
| Dec | 33° | 25° | 1.8 | 29° | 35° | – | – |
Heating costs most in Jun (about $74 with a heat pump, $112 with gas). Sunshine peaks in Jun at 7.8 kWh/m²/day (NASA satellite data, 46.2 km grid cell). Highlighted months are swimmable with no heater.
How Smithfield compares with nearby cities
Smithfield ranks 62 of 67 Utah cities for unheated swim months; Tremonton, Pleasant View nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| North Logan, UT | 4 mi | 0 | 4 | $98 |
| Logan, UT | 7 mi | 0 | 4 | $136 |
| Hyrum, UT | 14 mi | 0 | 4 | $162 |
| Tremonton, UT | 20 mi | 1 | 5 | $208 |
| Brigham City, UT | 26 mi | 0 | 5 | $233 |
| Pleasant View, UT | 36 mi | 2 | 5 | $156 |