Pool swim season in Evanston, WY
Swim season in Evanston without a heater, and with one
An unheated pool in Evanston never reaches 78°F in a normal year. It peaks around 67°F in Aug. The air allows up to 4 swimmable months with a heater (Jun to Sep).
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Heater options for a Evanston pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 0 | no month | $0 | $50 |
| Solar panels + cover | 2 | Jul to Aug | $0 | $283 |
| Heat pump + cover | 4 | Jun to Sep | $394 | $944 |
| Gas heater + cover | 4 | Jun to Sep | $606 | $1,031 |
For a 450 sq ft pool held at 80°F, at WY prices of 14.0¢/kWh electricity and $12/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Evanston
Heat pump + cover: 4 of 4 possible months for about $944 a year all-in, which works out near $236 for each month it adds.
A solar cover alone adds no swim months here, so if you want a longer season you need a heater (why); still use one at night to hold the heat you pay for. 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: Evanston 1 E, 1 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Evanston 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 | 33° | 22° | 2.3 | 21° | 27° | – | – |
| Feb | 35° | 24° | 3.2 | 23° | 29° | – | – |
| Mar | 44° | 33° | 4.4 | 30° | 36° | – | – |
| Apr | 53° | 40° | 5.6 | 39° | 45° | – | – |
| May | 63° | 49° | 6.6 | 48° | 54° | – | – |
| Jun | 73° | 57° | 7.7 | 58° | 64° | $147 | $221 |
| Jul | 81° | 64° | 7.4 | 65° | 71° | $72 | $121 |
| Aug | 80° | 63° | 6.5 | 67° | 73° | $56 | $91 |
| Sep | 71° | 55° | 5.3 | 61° | 67° | $119 | $173 |
| Oct | 58° | 44° | 3.7 | 50° | 56° | – | – |
| Nov | 43° | 31° | 2.4 | 37° | 43° | – | – |
| Dec | 33° | 22° | 1.9 | 25° | 31° | – | – |
Heating costs most in Jun (about $147 with a heat pump, $221 with gas). Sunshine peaks in Jun at 7.7 kWh/m²/day (NASA satellite data, 47.0 km grid cell). Highlighted months are swimmable with no heater.
How Evanston compares with nearby cities
Evanston ranks 9 of 11 Wyoming cities for unheated swim months; North Ogden, South Ogden, Ogden nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| North Ogden, UT | 52 mi | 1 | 4 | $64 |
| South Ogden, UT | 52 mi | 1 | 5 | $187 |
| Ogden, UT | 52 mi | 2 | 5 | $155 |
| Hyrum, UT | 52 mi | 0 | 4 | $162 |
| Farmington, UT | 53 mi | 1 | 4 | $48 |
| Centerville, UT | 53 mi | 1 | 4 | $66 |