Seminole/ Orange/Osceola....................................(407) 332-0078
Sarasota/Manatee..................................................(941) 955-0078
Volusia/Flagler........................................................(386) 226-0078
Hillsborough...........................................................(813) 226-0078
Pinellas.....................................................................(727) 467-0078
Polk...........................................................................(863) 802-0078

Unscreened Sheltered Pool Evaporation table

This table reflects approximate seasonal pool evaporation rates for unscreened sheltered installations--signified by substantial barriers (i.e. hedges, trees, fences, etc) near an open (unscreened) pool. Note...add column 2 with (any of) the applicable columns 3-7 to arrive at your pool's approximate evaporation rate. Setting up a leak/evaporation test is an even better way to measure your pool's water loss. Also, you may want to check out our FAQ to get a better understanding of evaporation.
Mo. Unscreened Sheltered *South Facing Floor jet system Solar heating **Heat Pump per 10 F ***Wind per 1mph
Jan 1/16"-1/8” +1/32” +1/32” +1/32” +1/16” -1/8” +25%
Feb 1/16"-1/8” +1/32” +1/32” +1/32” +1/16” -1/8” +25%
Mar 1/8”-3/16” +1/32 -1/16" +1/32 -1/16" +1/32 -1/16" +1/16” -1/8” +25%
Apr 3/16”-1/4” +1/32” -1/16” +1/32” -1/16” +1/32” -1/16” +1/16” -1/8” +25%
May 3/16”-1/4" +1/32” -1/16” +1/32” -1/16” +1/16” +1/16” -1/8” +25%
Jun 3/16”-1/4" +1/32” -1/16” +1/32” -1/16” +1/16” +1/16” +25%
Jul 1/8"-3/16” +1/32” +1/32” +1/32” -1/16” +1/16” +25%
Aug 1/8"-3/16” +1/32” +1/32” +1/32” -1/16” +1/16” +25%
Sep 1/8"-3/16” +1/32” +1/32” +1/32” -1/16” +1/16” +25%
Oct 3/16” +1/32” -1/16” +1/32” -1/16” +1/16” +1/16” -1/8” +25%
Nov 1/8”-3/16” +1/32” -1/16” +1/32” -1/16” +1/16” +1/16” -1/8” +25%
Dec 1/8” +1/32” -1/16” +1/32” +1/32” -1/16” +1/16” -1/8” +25%

* South-facing pools stay warmer (and evaporate more during cooler months) because they tend to absorb more sun energy and avoid northerly (winter) winds.

** Heat pump calculations are based on an every 10 degree (Fahrenheit) increment above ambient (the natural surrounding water) temperature.

*** Wind enhanced evaporation rates are based upon an every 1mph (avg.) increase in wind speed. For example, a constant 4mph wind (e.g. a cold front) would double a pool's evaporation rate.

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