Pool swim season in El Paso de Robles (Paso Robles), CA
When can you swim in an outdoor pool in El Paso de Robles (Paso Robles), CA?
An unheated pool in El Paso de Robles (Paso Robles) never reaches 78°F in a normal year. It peaks around 77°F in Aug. The air allows up to 7 swimmable months with a heater (Apr to Oct).
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Heater options for a El Paso de Robles (Paso Robles) pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 3 | Jul to Sep | $0 | $50 |
| Solar panels + cover | 6 | May to Oct | $0 | $283 |
| Heat pump + cover | 7 | Apr to Oct | $683 | $1,233 |
| Gas heater + cover | 7 | Apr to Oct | $870 | $1,295 |
For a 450 sq ft pool held at 80°F, at CA prices of 32.6¢/kWh electricity and $22/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in El Paso de Robles (Paso Robles)
Solar panels + cover: 6 of 7 possible months for about $283 a year all-in, which works out near $47 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 3 months 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: Paso Robles, 2 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
El Paso de Robles (Paso Robles) 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 | 62° | 48° | 2.9 | 48° | 54° | – | – |
| Feb | 64° | 50° | 3.8 | 50° | 56° | – | – |
| Mar | 68° | 54° | 5.2 | 54° | 60° | – | – |
| Apr | 73° | 57° | 6.6 | 59° | 65° | $313 | $380 |
| May | 80° | 63° | 7.7 | 65° | 71° | $181 | $238 |
| Jun | 87° | 68° | 8.3 | 71° | 77° | $57 | $80 |
| Jul | 91° | 72° | 8.0 | 75° | 81° | – | – |
| Aug | 92° | 72° | 7.3 | 77° | 83° | – | – |
| Sep | 89° | 69° | 6.2 | 74° | 80° | – | – |
| Oct | 81° | 62° | 4.6 | 67° | 73° | $132 | $172 |
| Nov | 69° | 53° | 3.3 | 58° | 64° | – | – |
| Dec | 61° | 47° | 2.6 | 50° | 56° | – | – |
Heating costs most in Apr (about $313 with a heat pump, $380 with gas). Sunshine peaks in Jun at 8.3 kWh/m²/day (NASA satellite data, 19.7 km grid cell). Highlighted months are swimmable with no heater.
How El Paso de Robles (Paso Robles) compares with nearby cities
El Paso de Robles (Paso Robles) ranks 226 of 376 California cities for unheated swim months; Coalinga nearby gets a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Atascadero, CA | 10 mi | 0 | 7 | $683 |
| Morro Bay, CA | 22 mi | 0 | 2 | $311 |
| San Luis Obispo, CA | 25 mi | 0 | 7 | $981 |
| Arroyo Grande, CA | 35 mi | 0 | 6 | $969 |
| Grover Beach, CA | 35 mi | 0 | 6 | $969 |
| Coalinga, CA | 39 mi | 4 | 8 | $572 |