Pool season · California
Compton Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Compton 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.
Compton, CA — 0 swim days a yearEach dot on the bar is one week of Compton's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (March 8–March 29), solid teal is swim season, and hollow amber is the closing window ending December 2. The black marker is today — its position against the colors is the entire executive summary.
The Compton pool calendar
Opening — target March 15
Target March 15; the practical window runs March 8–March 29, and the 7-day mean crosses the 61°F threshold around March 29. Cold-water starts are the cheap ones.
Closing — deadline December 2
The window opens November 22 once water leaves the algae zone; the model deadline is December 2, a week ahead of the January 5 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Compton's own normals — the shape of a typical year, not a forecast. The widget above shows where the current year actually sits.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 58° | 58° | 60° | 61° | 64° | 66° | 70° | 72° | 72° | 70° | 66° | 59° |
The curve peaks near 72°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Clovis's pool season and Concord's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the California season index.
Compton pool season FAQ
When should I open my pool in Compton, CA?
Open by March 15 — the model places Compton's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Compton opening guide has the 12-step sequence.
When should I close my pool in Compton?
Close by December 2: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Compton closing guide sequences the work backward from that date.
How long is the swim season in Compton?
Compton averages 0 days a year with normal highs of 80°F or better — about 17 days earlier than the California median. The California season index ranks all 147 covered cities by the same metric.
How warm does pool water get in Compton?
An unheated pool near Compton typically peaks around 72°F in high summer and bottoms out near 57°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Compton hits the closing window
Data: NOAA 1991–2020 climate normals via Hawthorne Municipal Airport (6.5 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.