Pool season · Wisconsin
Appleton Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Appleton pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Reading it takes ten seconds: 52 dots, one per week. Solid teal is Appleton's swim season; the hollow teal run before it (May 7 to May 28) is when to open; the hollow amber run after is when to close, with September 26 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Appleton pool calendar
Opening — target May 14
Open by May 14 — a two-week head start on the May 28 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline September 26
The window opens September 16 once water leaves the algae zone; the model deadline is September 26, a week ahead of the October 6 freeze normal.
Estimated water temperature by month
This is Appleton's typical-year water curve: the same EWMA model as the live widget, run on the 1991–2020 normals instead of this week's weather.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20° | 18° | 26° | 38° | 51° | 63° | 70° | 71° | 66° | 55° | 42° | 29° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Appleton hits the closing window
Data: NOAA 1991–2020 climate normals via Appleton (2.4 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.