Pool swim season in West Linn, OR
When can you swim in an outdoor pool in West Linn, OR?
An unheated pool in West Linn never reaches 78°F in a normal year. It peaks around 74°F in Aug. The air allows up to 5 swimmable months with a heater (May to Sep).
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What each heater buys you in West Linn
| Option | Months | Swimmable | Energy/yr | All-in/yr |
|---|---|---|---|---|
| No heater | 0 | no month | $0 | $0 |
| Solar cover only | 1 | Aug | $0 | $50 |
| Solar panels + cover | 4 | Jun to Sep | $0 | $283 |
| Heat pump + cover | 5 | May to Sep | $290 | $840 |
| Gas heater + cover | 5 | May to Sep | $612 | $1,037 |
For a 450 sq ft pool held at 80°F, at OR prices of 15.5¢/kWh electricity and $17/Mcf gas. All-in spreads the purchase over the equipment's life.
The cheapest way to the full season in West Linn
Solar panels + cover: 4 of 5 possible months for about $283 a year all-in, which works out near $71 for each month it adds.
Before you pay for any heater, buy a solar cover: on its own it adds 1 month 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: Oregon City, 1.8 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.
West Linn 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 | 48° | 43° | 1.2 | 40° | 46° | – | – |
| Feb | 53° | 45° | 2.1 | 43° | 49° | – | – |
| Mar | 58° | 49° | 3.0 | 47° | 53° | – | – |
| Apr | 64° | 53° | 4.3 | 52° | 58° | – | – |
| May | 71° | 60° | 5.4 | 59° | 65° | $144 | $291 |
| Jun | 76° | 65° | 6.0 | 65° | 71° | $79 | $171 |
| Jul | 84° | 71° | 6.8 | 71° | 77° | $22 | $51 |
| Aug | 84° | 71° | 5.8 | 74° | 80° | $4 | $10 |
| Sep | 78° | 65° | 4.3 | 69° | 75° | $41 | $89 |
| Oct | 65° | 56° | 2.6 | 60° | 66° | – | – |
| Nov | 53° | 47° | 1.4 | 50° | 56° | – | – |
| Dec | 47° | 42° | 1.0 | 42° | 48° | – | – |
Heating costs most in May (about $144 with a heat pump, $291 with gas). Sunshine peaks in Jul at 6.8 kWh/m²/day (NASA satellite data, 18.4 km grid cell). Highlighted months are swimmable with no heater.
How West Linn compares with nearby cities
West Linn ranks 14 of 57 Oregon cities for unheated swim months, and no nearby city gets a longer unheated season.
| City | Distance | Unheated months | Heat pump months | Heat pump $/yr |
|---|---|---|---|---|
| Gladstone, OR | 3 mi | 0 | 5 | $290 |
| Oregon City, OR | 3 mi | 0 | 5 | $290 |
| Lake Oswego, OR | 4 mi | 0 | 5 | $290 |
| Milwaukie, OR | 5 mi | 0 | 4 | $191 |
| Tualatin, OR | 7 mi | 0 | 5 | $395 |
| Canby, OR | 7 mi | 0 | 4 | $221 |