Pool swim season in Roy, UT
When can you swim in an outdoor pool in Roy, UT?
An unheated pool in Roy 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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What each heater buys you in Roy
| 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 | $187 | $737 |
| Gas heater + cover | 5 | May to Sep | $275 | $700 |
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 Roy
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: Ogden Hinkley Airport, 2.3 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Roy 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 | 36° | 29° | 1.7 | 28° | 34° | – | – |
| Feb | 42° | 33° | 2.7 | 31° | 37° | – | – |
| Mar | 53° | 43° | 4.2 | 39° | 45° | – | – |
| Apr | 60° | 49° | 5.7 | 49° | 55° | – | – |
| May | 70° | 59° | 6.7 | 58° | 64° | $137 | $194 |
| Jun | 82° | 68° | 7.7 | 68° | 74° | $42 | $68 |
| Jul | 91° | 78° | 7.6 | 78° | 84° | – | – |
| Aug | 89° | 76° | 6.7 | 81° | 87° | – | – |
| Sep | 78° | 65° | 5.3 | 73° | 79° | $8 | $13 |
| Oct | 63° | 52° | 3.7 | 59° | 65° | – | – |
| Nov | 49° | 40° | 2.3 | 45° | 51° | – | – |
| Dec | 37° | 30° | 1.5 | 33° | 39° | – | – |
Heating costs most in May (about $137 with a heat pump, $194 with gas). Sunshine peaks in Jun at 7.7 kWh/m²/day (NASA satellite data, 52.5 km grid cell). Highlighted months are swimmable with no heater.
How Roy compares with nearby cities
Roy ranks 34 of 67 Utah cities for unheated swim months; West Haven, Ogden nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Clinton, UT | 2 mi | 1 | 5 | $187 |
| West Haven, UT | 3 mi | 2 | 5 | $153 |
| West Point, UT | 4 mi | 1 | 5 | $187 |
| South Ogden, UT | 5 mi | 1 | 5 | $187 |
| Clearfield, UT | 5 mi | 1 | 4 | $73 |
| Ogden, UT | 6 mi | 2 | 5 | $155 |