DecemberWarmSunsetBaltimoreWhen warm air surges in the beginning of winter, it often stays a little while. I noticed a unique pattern for December record high temperatures in Baltimore.  They show up in the history book as pairs or groups. I often point out that warm ups tend to end up warmer and last longer than first thought. History shows a lot of truth to that and not just in El Nino patterns.

We just reached a record go 71°F on Saturday December and when I looked at the year we just tied, 1979 had two record high days in a row for the 11th and 12th.  I had been foresting a new record for today, the 13th, that would break a mark set 126 years, back in 1889. That was a single day mark, but a pattern of pairs jumped out. There are severe sets of ‘pairs’, where two days in a row had record high temperatures. But there are clusters or groups as well. That means more than one record high was set in a single year, but not consecutively in that month.

December Record High Temp Groups

Record High Days In Pairs:

  • 1998: 6th and 7th
  • 1966: 9th and 10th
  • 1979: 11th and 12th
  • *2015: 12th (tied) and 13th (72F°)
  • 1971: 15th and 16th
  • 2013: 21st and 22nd
  • 1990: 23rd and 24th
  • 1964: 25th and 26th

Record High Days In Groups Or Clusters

  • 2006: 1st and 18th
  • 1998: 3rd plus 6th and 7th
  • 1984: 17th and 29th
  • 1990: 23rd and 24th plus 30th

Here is the original record list. Notice the * shows records set on multiple dates prior to the one listed. It is possible more clusters are prevalent, but I did not dig deeper to sort that out).

  • DY= Day
  • NMX= Normal or average Max temp
  • Also notice
  • HIMIN- A record for the warmest minimum or low temperature. We could set a record for that on Monday the 14th


What does this mean?

  1. Record Highs often reach the 70s in Baltimore
  2. Record Highs are scattered throughout history and are nothing new
  3. Record Highs tend to occur more than once in years with warm weather patterns.


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Chip KidWxDevicesGet the award winning Kid Weather App I made with my oldest son and support our love for science, weather, and technology. Our 3 year anniversary of the release and our contribution to STEM education is this November. It has been downloaded in 60 countries, and works in both temperature scales. With your support we can expand on the fun introduction to science and real weather.

This year, we were expected to reach 70F all week, but that was meant to occur on Sunday. So with a warmer day expected tomorrow, we shall likely have another two-for record setting warm mark in the record books. Doubling of warm records is actually somewhat common. I will expand on that in my next post.