Pool swim season in Kerrville, TX
Kerrville, TX: how long the pool season really is
An unheated pool in Kerrville reaches 78°F in Jun to Sep, about 4 months a year. The air allows up to 7 swimmable months with a heater (Apr to Oct).
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Heater options for a Kerrville pool, side by side
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 4 | Jun to Sep | $0 | $0 |
| Solar cover only | 4 | Jun to Sep | $0 | $50 |
| Solar panels + cover | 7 | Apr to Oct | $0 | $283 |
| Heat pump + cover | 7 | Apr to Oct | $137 | $687 |
| Gas heater + cover | 7 | Apr to Oct | $337 | $762 |
For a 450 sq ft pool held at 80°F, at TX prices of 16.0¢/kWh electricity and $19/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Kerrville
Solar panels + cover: 7 of 7 possible months for about $283 a year all-in, which works out near $94 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: Kerrville 3 NNE, 2.8 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Kerrville 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 | 59° | 46° | 3.3 | 48° | 54° | – | – |
| Feb | 63° | 51° | 4.0 | 49° | 55° | – | – |
| Mar | 70° | 58° | 4.9 | 56° | 62° | – | – |
| Apr | 76° | 64° | 5.8 | 64° | 70° | $95 | $230 |
| May | 82° | 72° | 6.1 | 71° | 77° | $23 | $60 |
| Jun | 89° | 78° | 7.0 | 79° | 85° | – | – |
| Jul | 92° | 81° | 6.9 | 83° | 89° | – | – |
| Aug | 93° | 81° | 6.4 | 84° | 90° | – | – |
| Sep | 87° | 75° | 5.2 | 80° | 86° | – | – |
| Oct | 78° | 66° | 4.4 | 72° | 78° | $19 | $47 |
| Nov | 67° | 56° | 3.4 | 61° | 67° | – | – |
| Dec | 60° | 48° | 3.0 | 52° | 58° | – | – |
Heating costs most in Apr (about $95 with a heat pump, $230 with gas). Sunshine peaks in Jun at 7.0 kWh/m²/day (NASA satellite data, 62.4 km grid cell). Highlighted months are swimmable with no heater.
How Kerrville compares with nearby cities
Kerrville ranks 242 of 252 Texas cities for unheated swim months; Helotes, Leon Valley nearby get a longer season without a heater.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Fredericksburg, TX | 22 mi | 4 | 8 | $291 |
| Boerne, TX | 30 mi | 4 | 9 | $364 |
| Fair Oaks Ranch, TX | 36 mi | 4 | 9 | $364 |
| Helotes, TX | 42 mi | 5 | 9 | $191 |
| Leon Valley, TX | 49 mi | 5 | 9 | $191 |
| San Antonio, TX | 54 mi | 4 | 9 | $265 |