Pool swim season in Nogales, AZ
When can you swim in an outdoor pool in Nogales, AZ?
An unheated pool in Nogales reaches 78°F in Jun to Sep, about 4 months a year. The air allows up to 9 swimmable months with a heater (Mar to Nov).
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Heater options for a Nogales pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 4 | Jun to Sep | $0 | $0 |
| Solar cover only | 5 | Jun to Oct | $0 | $50 |
| Solar panels + cover | 7 | Apr to Oct | $0 | $283 |
| Heat pump + cover | 9 | Mar to Nov | $404 | $954 |
| Gas heater + cover | 9 | Mar to Nov | $900 | $1,325 |
For a 450 sq ft pool held at 80°F, at AZ prices of 15.4¢/kWh electricity and $19/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Nogales
Heat pump + cover: 9 of 9 possible months for about $954 a year all-in, which works out near $191 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: Nogales International Airport, 6.6 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Nogales 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 | 66° | 50° | 3.8 | 51° | 57° | – | – |
| Feb | 68° | 52° | 4.7 | 53° | 59° | – | – |
| Mar | 73° | 57° | 6.2 | 57° | 63° | $165 | $357 |
| Apr | 79° | 62° | 7.6 | 64° | 70° | $93 | $217 |
| May | 88° | 70° | 8.3 | 71° | 77° | $24 | $61 |
| Jun | 97° | 80° | 8.1 | 80° | 86° | – | – |
| Jul | 94° | 81° | 6.5 | 84° | 90° | – | – |
| Aug | 92° | 79° | 6.3 | 83° | 89° | – | – |
| Sep | 90° | 75° | 5.8 | 80° | 86° | – | – |
| Oct | 83° | 66° | 5.2 | 73° | 79° | $8 | $20 |
| Nov | 73° | 57° | 4.1 | 63° | 69° | $114 | $245 |
| Dec | 65° | 49° | 3.5 | 54° | 60° | – | – |
Heating costs most in Mar (about $165 with a heat pump, $357 with gas). Sunshine peaks in May at 8.3 kWh/m²/day (NASA satellite data, 44.0 km grid cell). Highlighted months are swimmable with no heater.
How Nogales compares with nearby cities
Nogales ranks 36 of 44 Arizona cities for unheated swim months; Tucson nearby gets a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Sierra Vista, AZ | 39 mi | 2 | 9 | $552 |
| Sahuarita, AZ | 39 mi | 4 | 9 | $262 |
| Tucson, AZ | 55 mi | 5 | 9 | $206 |
| Oro Valley, AZ | 73 mi | 4 | 9 | $411 |
| Marana, AZ | 77 mi | 4 | 9 | $409 |
| Douglas, AZ | 82 mi | 4 | 9 | $404 |