Pool swim season in Manhattan, KS
Swim season in Manhattan without a heater, and with one
An unheated pool in Manhattan reaches 78°F in Jul to Aug, about 2 months a year. The air allows up to 5 swimmable months with a heater (May to Sep).
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What each heater buys you in Manhattan
| 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 | 5 | May to Sep | $103 | $653 |
| Gas heater + cover | 5 | May to Sep | $202 | $627 |
For a 450 sq ft pool held at 80°F, at KS prices of 15.3¢/kWh electricity and $15/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in Manhattan
Solar cover only: 4 of 5 possible months for about $50 a year all-in, which works out near $25 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 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: Manhattan, 1.4 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
Manhattan 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 | 40° | 29° | 2.3 | 30° | 36° | – | – |
| Feb | 45° | 34° | 3.1 | 31° | 37° | – | – |
| Mar | 56° | 44° | 4.0 | 40° | 46° | – | – |
| Apr | 66° | 54° | 5.1 | 51° | 57° | – | – |
| May | 76° | 65° | 5.9 | 63° | 69° | $101 | $197 |
| Jun | 86° | 75° | 6.7 | 74° | 80° | $2 | $5 |
| Jul | 91° | 80° | 6.5 | 81° | 87° | – | – |
| Aug | 89° | 78° | 5.8 | 82° | 88° | – | – |
| Sep | 81° | 69° | 4.8 | 75° | 81° | – | – |
| Oct | 69° | 57° | 3.5 | 63° | 69° | – | – |
| Nov | 55° | 43° | 2.5 | 49° | 55° | – | – |
| Dec | 43° | 33° | 2.0 | 37° | 43° | – | – |
Heating costs most in May (about $101 with a heat pump, $197 with gas). Sunshine peaks in Jun at 6.7 kWh/m²/day (NASA satellite data, 35.8 km grid cell). Highlighted months are swimmable with no heater.
How Manhattan compares with nearby cities
Manhattan ranks 20 of 38 Kansas cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Junction City, KS | 17 mi | 2 | 5 | $119 |
| Topeka, KS | 50 mi | 2 | 5 | $103 |
| Emporia, KS | 59 mi | 2 | 5 | $140 |
| Salina, KS | 60 mi | 2 | 5 | $98 |
| Lawrence, KS | 74 mi | 2 | 5 | $106 |
| Beatrice, NE | 75 mi | 2 | 5 | $151 |