Pool season · Ohio
Parma Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
Parma's whole pool calendar, condensed: when the water warms, when it cools, and where today falls between those edges. Use the opening guide and closing guide for the step-by-step work; keep this page for the dates.
Parma, OH — 78 swim days a yearEach dot on the bar is one week of Parma's typical year, colored by what the model says that week is for: gray weeks are off-season, hollow teal marks the opening window (April 25–May 16), solid teal is swim season, and hollow amber is the closing window ending October 10. The black marker is today — its position against the colors is the entire executive summary.
The Parma pool calendar
Opening — target May 2
Open by May 2 — a two-week head start on the May 16 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline October 10
The window opens September 30 once water leaves the algae zone; the model deadline is October 10, a week ahead of the November 3 freeze normal.
Estimated water temperature by month
Monthly averages of the site's water model run on Parma'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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 31° | 29° | 35° | 45° | 57° | 67° | 74° | 74° | 70° | 61° | 49° | 39° |
The curve peaks near 74°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Newark's pool season and Springfield's — neighboring normals stations can shift the windows by a week or more. The full ranking lives on the Ohio season index.
Parma pool season FAQ
When should I open my pool in Parma, OH?
Open by May 2 — the model places Parma's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Parma opening guide has the 12-step sequence.
When should I close my pool in Parma?
Close by October 10: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Parma closing guide sequences the work backward from that date.
How long is the swim season in Parma?
Parma averages 78 days a year with normal highs of 80°F or better — right on the statewide median. The Ohio season index ranks all 14 covered cities by the same metric.
How warm does pool water get in Parma?
An unheated pool near Parma typically peaks around 74°F in high summer and bottoms out near 29°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 Parma hits the closing window
Data: NOAA 1991–2020 climate normals via Cleveland (7.1 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.