Deke Arndt writes more details about the relationship between spring rain and summer temperature in the latest Beyond the Data from NOAA.  It turns out that spring rain affects daytime high temperatures much more than nighttime low temperatures due to the effects of solar radiation during the day on wet soil which is not seen at night (no sun, duh!).  You can read this entertaining article here.

Precip_maxtemp_relationship_620_1 Precip_mintemp_relationship_620

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