Pool season · California
Whittier Pool Season: the Year on One Bar
Last updated: July 15, 2026 · dates · water temp
One bar, one year, one Whittier 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 Whittier's swim season; the hollow teal run before it (February 20 to March 13) is when to open; the hollow amber run after is when to close, with November 30 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Whittier pool calendar
Opening — target February 27
Target February 27; the practical window runs February 20–March 13, and the 7-day mean crosses the 61°F threshold around March 13. Cold-water starts are the cheap ones.
Closing — deadline November 30
Hold the cover until November 20, then winterize by November 30, a week ahead of the January 2 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
This is Whittier'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 57° | 58° | 60° | 63° | 66° | 69° | 74° | 76° | 76° | 72° | 66° | 59° |
The curve peaks near 77°F — comfortable-water months here usually involve a heater or a solar cover.
Email me when Whittier hits the closing window
Data: NOAA 1991–2020 climate normals via Fullerton Municipal Airport (7.0 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.