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Old 01-19-2012, 07:33 AM
 
Location: Duluth, Minnesota, USA
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What is the highest temperature it has ever rained at?

What's the highest temperature you've seen it rain at?
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Old 01-19-2012, 07:40 AM
 
Location: London, UK
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Ah, very interesting question.

From my experience in the tropics (Hong Kong & Singapore), I have seldom, if ever, seen rain above 26°C (except at the immediate moment when it starts raining of course).

Usually in Singapore, morning temp is around 24°C, then it heats up to 31°C, a thunderstorm starts and then it rains hard at a temp of around 25-26°C, then it clears up and stays at 24-27°C for the night.
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Old 01-19-2012, 07:47 AM
 
Location: Laurentia
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The highest temperature I've ever seen it rain I think is in the mid to high 90's Fahrenheit, when a thunderstorm arose at that temperature and started raining. Of course the temperature dropped quickly after it rained.

I'm not sure of the highest temperature it's ever rained, but I've seen local forecast videos with thunderstorms popping up and raining in Pennsylvania in the low 100's Fahrenheit. I think the figure would be somewhere in the 100's, and a good bet would be to look at the Southwest Monsoon in North America for hot rains.
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Old 01-19-2012, 08:51 AM
 
Location: Perth, Western Australia
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Most recent example I can think of here was in January 2011 here where the temperature at 2pm was 41C / 106F after which we had about an hour of thunderstorms and rain which dropped the temperature to 25C / 77F.

History : Weather Underground

I also think the Southwest Monsoon in the US would probably have the most hot rains though even around Phoenix, after prolonged heavy rain and humidity around 100% the temperatures will fall to around 25C / 77F, even though they obviously start hot. While some Middle Eastern cities have equally high summer temperatures they have virtually zero rainfall to go with the high temps.
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Old 01-19-2012, 08:53 AM
 
Location: The western periphery of Terra Australis
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There was one very freakish event in Perth a few years ago. It was 11pm - pitch black, a roaring northerly, light horizontal rain and the temperature was an incredible 37.7C (100F) . I don't know it's some localised phenomenon, because it only lasted an hour or so before the temperature plummeted into the high twenties. It's the only time I've experienced it and I haven't read about such a phenomenon. I think the conditions were just really unusual. 38C is unusually hot but not too uncommon during heatwaves here, but at midnight? I was thinking if those conditions had kept up, Perth could have seen a 24 hour minimum of at least 32-33C.

I've wondered about this question myself. My personal feeling is around the 40C (104F) mark is the highest possible temperature where it can be 100% humidity at that level. In Perth, apart from the above-mentioned example, the hottest I've seen it rain at was probably 35C (95F). This is during swelteringly hot days JUST as a thunderstorm breaks. After an hour the temperature has dropped below 30C. I can imagine it raining at 100F and above for short periods in the desert Southwest in July and August. Also the Kimberley in NW WA remains pretty darn hot during the wet season. Typical December lows are least 27C with highs of over 37C with significant rain so I imagine rain at 32C/90F isn't too uncommon. Usually, after it rains for awhile the temperature will drop, but not always.
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Old 01-19-2012, 08:55 AM
 
Location: The western periphery of Terra Australis
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Quote:
Originally Posted by dhdh View Post
Ah, very interesting question.

From my experience in the tropics (Hong Kong & Singapore), I have seldom, if ever, seen rain above 26°C (except at the immediate moment when it starts raining of course).

Usually in Singapore, morning temp is around 24°C, then it heats up to 31°C, a thunderstorm starts and then it rains hard at a temp of around 25-26°C, then it clears up and stays at 24-27°C for the night.
26C is probably a bit low. Maybe 28-29C. Remember Hong Kong's July average minimum is a very warm 26.7C (80F) and it rains a ton so technically it gets a lot of rain at temperatures above that.
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Old 01-19-2012, 10:56 AM
 
Location: Toronto
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That's an interesting topic. I've never thought about it but now I'm curious. I wonder about monsoonal places like India or other wet-and-dry climes where the hottest month peaks at 40C or so or even more, but that's usually a dry month that precedes the wet ones?
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Old 01-19-2012, 12:03 PM
 
Location: London, UK
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Trimac20, I'm pretty sure it is impossible to have 40°C with 100% RH - that would be a 40°C dewpoint, that's way too high !

However you are right about Hong Kong, apparently it can rain at more than 27°C there - at least that's what it seems :
EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG, AUGUST 2011
August 16 had a minimum temp of 28.1°C, yet 8.5mm.
Similarly, the minimum on Aug 31 was 28.7°C with 0.5mm of rain (but that's quite a low rainfall amount so it's not exactly relevant)

Stumbler., you will see that generally in India, the hottest months are right before the advent of the monsoon, e.g. May in Delhi when it peaks at 40°C, but as you say that's generally dry months.
I went a few times to Delhi and I noticed there are two kind of days (around July) : dry, sunny 40°C; and 27°C heavy rain.
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Old 01-19-2012, 02:24 PM
 
Location: Paris
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^^ Yep the highest dew point ever recorded was "only" 35C/95F in Dhahran, Saudi Arabia. Nice HI at that moment, 78C/172F. Great beach weather lol.

I dunno for the hottest rain, was thinking about northern India at the beginning of the monsoon too.
Personally I witnessed some droplets from mid-altitude clouds at 34C/93F in Paris, no proper rain though.
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Old 01-19-2012, 03:15 PM
 
Location: London, UK
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78°c?!
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