Saturday, June 1, 2013

Oh What a May It Was

Hard to know how to present all the notable events of May 2013, so when in doubt, put up a chart. Here's a plot of the daily mean temperature at Fairbanks in May.

Only six seven days the entire month were within one standard deviation of normal. On to the highlights:
In the Weather Bureau/NWS era (starting 1930)
  • 10th coldest May
  • Latest date (May 18th) of record with a daily high temperature below 40ºF and daily mean  below freezing
  • Three daily record low temperatures and two record low max temperatures
  • Winter snowpack melt-out of May 11 is the second latest of record
  • 18 days with daily low temperatures of  ≤32ºF is most in May since 1964
  • Green-up of West Chena Ridge as seen from UAF on May 26th is latest since observations began in 1974 and probably latest since 1964
  • The 47 consecutive days with daily mean temperature below normal appears to be a record for such a streak, though it is not a record for consecutive days with departure of the same sign (53 days in a row in autumn 2002 above normal)
  • Lowest April-May of record (mean temperature 31.3ºF)
  • Fourth lowest March-April-May of record (mean temperature 23.2ºF)
On the warm side:
  • Daily record high of 84ºF tied on the 30th
  • Five days with highs in the 80s ties for second greatest such days in May (record is seven days in 2011)
  • First time ever in May with five straight days of highs 82ºF or higher (thanks to reader Brian for this one)

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