Hottest Rain on Record: Rain Falls at 119°F in Imperial, California
Above: Summer rain showers fall
over the desert region about 40 miles northeast of Imperial,
California, as seen from Belle Mountain in Joshua Tree National
Park, at 12:15 pm PDT July 19, 2017, when the temperature was
100°F (38°C). Image credit: National
2 August, 2018
Update: Paul Iniguez of the Phoenix National Weather Service office has done more detailed analysis on the July 24, 2018 rain event at Imperial, and has concluded: "Did quite a bit of analysis on this. Based on all the data (radar, satellite, soundings, area obs), this looks like an error with the present wx sensor.
I really don't think this is a new record." The present weather sensor is what measures the presence of rain, when only a trace of rain is reported, and it is possible for this sensor to get fooled. In particular, there was not significant cloud cover apparent on satellite imagery during the first hour that rain was reported at Imperial, though clouds did move in after that. In light of Paul's analysis, we have to regard the world-record hottest rainfall event at Imperial, California as questionable.
weather conditions observed in Imperial, California on July 24,
2018, courtesy of NOAA. Rain was observed for four consecutive
hours beginning at 3:53 pm PDT, with a temperature of 119°F
(48.3°C) occurring during the first two hours of the event. A big
thank-you goes to weather records expert Jérôme Reynaud
of Géoclimat for
bringing this event to my attention.