diff --git a/src/Environment/climate.cxx b/src/Environment/climate.cxx
index ac8586495..e83d8b897 100644
--- a/src/Environment/climate.cxx
+++ b/src/Environment/climate.cxx
@@ -882,6 +882,9 @@ void FGClimate::set_environment()
         {
             // https://weatherins.com/rain-guidelines/
             _wetness = 12.0*std::max(_gl.precipitation-50.0, 0.0)/990.0;
+
+            // clamping term, see https://sourceforge.net/p/flightgear/codetickets/2604/
+            _wetness = pow(sin(atan(SGD_PI*_wetness)), 2.0);
         } else {
             _wetness = 0.0;
         }