Wednesday, July 14, 2021

Yesterday Was the Hottest on Record in Salt Lake City

Yesterday morning I opened the door at 6 AM for a walk and was blown away by a hot blast.  It seemed ridiculously warm.  

Indeed, the remarkably high 82˚F minimum temperature mentioned in yesterday's blog post held up for the calendar day held up as the minimum for the day, setting a new all-time record for the highest minimum temperature.  

Below are the 63 highest minimum temperatures observed in Salt Lake City (basically, every day with a minimum of 77˚F or higher).  You will likely noticed something not all that surprising.  A supermajority (about 78%) have occurred in the 21st century.  

Additionally, yesterday was the hottest day on record in Salt Lake City, with an average temperature [i.e., (Tmax+Tmin)/2] of 93˚F thanks to a maximum temperature of 104˚F.  This was a full 1.5˚F warmer than the previous record of 91.5˚F set on 15 July 2007.  There are 19 days on record with an average temperature of 90˚F or higher, and all but 2 of them have occurred in the 21st century.  

Such a shame.


  1. I was very impressed with the convection in southern Utah yesterday afternoon. Several of the cells in Iron County had pretty impressive rotation signatures on radar (at least for these parts). And then they all organized into a squall line that it sounds like did quite a bit of wind damage to the St George area. All in addition to a landspout tornado in Huntington.

    What I wouldn't give to see weather like that in the northern half of the state...

  2. The heat has been relentless this year. Hoping we can get some more monsoon action next week.

  3. Looking at surface observations this morning, there appears to be a rather strong moisture gradient over eastern Nevada. As I type this, dewpoints in central Nevada are in the 20s or lower (Elko is 22) - but values in the high 40s are widespread over far eastern Nevada and western Utah (46 at Ely, 49 at Wendover).

    Does this sort of quasi-dryline setup occur on a regular basis, and does it contribute to why the eastern Nevada mountains often seem to be the first to convect on a given afternoon?