Pool swim season in South Lyon, MI

When can you swim in an outdoor pool in South Lyon, MI?

An unheated pool in South Lyon never reaches 78°F in a normal year. It peaks around 72°F in Aug. The air allows up to 4 swimmable months with a heater (Jun to Sep).

1. J
2. F
3. M
4. A
5. M
6. J
7. J
8. A
9. S
10. O
11. N
12. D

What each heater buys you in South Lyon

For a 450 sq ft pool held at 80°F, at MI prices of 21.7¢/kWh electricity and $11/Mcf gas. All-in spreads the purchase over the equipment's life.

The cheapest way to the full season in South Lyon

Solar panels + cover: 4 of 4 possible months for about $283 a year all-in, which works out near $71 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 gas as well as a heat pump: once the purchase price is counted, gas comes out cheaper all-in here (heat pump or gas).

Weather station: Whitmore Lake 1NW, 6.9 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.

South Lyon month by month: air, sun and pool water

Heating costs most in Jun (about $118 with a heat pump, $121 with gas). Sunshine peaks in Jul at 6.2 kWh/m²/day (NASA satellite data, 13.3 km grid cell). Highlighted months are swimmable with no heater.

How South Lyon compares with nearby cities

South Lyon ranks 84 of 90 Michigan cities for unheated swim months, and no nearby city gets a longer unheated season.