Pool swim season in Fredericksburg, VA
When can you swim in an outdoor pool in Fredericksburg, VA?
An unheated pool in Fredericksburg reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 6 swimmable months with a heater (May to Oct).
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
What each heater buys you in Fredericksburg
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 2 | Jul to Aug | $0 | $0 |
| Solar cover only | 4 | Jun to Sep | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 6 | May to Oct | $230 | $780 |
| Gas heater + cover | 6 | May to Oct | $440 | $865 |
For a 450 sq ft pool held at 80°F, at VA prices of 16.9¢/kWh electricity and $17/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Fredericksburg
Heat pump + cover: 6 of 6 possible months for about $780 a year all-in, which works out near $195 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 a heat pump sized to your pool's surface area; here it beats gas all-in (heat pump or gas).
Weather station: Fredericksburg Sewage, 2.1 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Fredericksburg 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 | 46° | 36° | 2.2 | 37° | 43° | – | – |
| Feb | 49° | 38° | 3.0 | 37° | 43° | – | – |
| Mar | 57° | 45° | 4.0 | 43° | 49° | – | – |
| Apr | 69° | 56° | 5.0 | 53° | 59° | – | – |
| May | 76° | 65° | 5.6 | 63° | 69° | $109 | $216 |
| Jun | 84° | 74° | 6.2 | 72° | 78° | $15 | $33 |
| Jul | 89° | 78° | 6.0 | 79° | 85° | – | – |
| Aug | 87° | 76° | 5.4 | 80° | 86° | – | – |
| Sep | 80° | 70° | 4.4 | 74° | 80° | – | – |
| Oct | 70° | 58° | 3.3 | 64° | 70° | $106 | $191 |
| Nov | 59° | 47° | 2.5 | 52° | 58° | – | – |
| Dec | 50° | 39° | 1.9 | 42° | 48° | – | – |
Heating costs most in May (about $109 with a heat pump, $216 with gas). Sunshine peaks in Jun at 6.2 kWh/m²/day (NASA satellite data, 22.3 km grid cell). Highlighted months are swimmable with no heater.
How Fredericksburg compares with nearby cities
Fredericksburg ranks 15 of 39 Virginia cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Culpeper, VA | 30 mi | 0 | 5 | $205 |
| Manassas, VA | 31 mi | 2 | 5 | $144 |
| Manassas Park, VA | 33 mi | 2 | 5 | $144 |
| La Plata, MD | 33 mi | 0 | 5 | $220 |
| Warrenton, VA | 33 mi | 0 | 5 | $184 |
| Fairfax, VA | 40 mi | 0 | 5 | $211 |