So how does this April so far compare to the last few years comparing day-to-day HIGH temperatures drops and rises compared to the normal high of the day? Here are the largest "drops and rises" compared to the daily normal over the 25 Aprils through the first two weeks. For example, if the high was 80 (normal for that date was 60 for a +20 degree difference) and the next day, the high was 45 (normal was 61 for a -16 degree difference), the final difference over the 24 hour period was -36 degrees! These are the numbers I used in the graph below.
Don't be intimidated by this chart. There a lot of numbers here. First, I BOLDFACED the instances of day-to-day positive change (WARMER) of more than 10 degrees. Second, I underlined instances where the temperature change was more than 10 degrees for back-to-back days. Frankly, I couldn't figure out a good way of illustrating this so the raw data will have to do for now.
Here are some of my notable conclusions:
Recently, 2011 had some VERY big "ups and downs". During one stretch in 2011, temperatures dropped 31 degrees in 24 hours then rose 13 degrees the following day!
April 2010 had an instance where temperatures dropped 20 degrees and then rose 22 degrees the following day.
April 2007 had a 12 degree jump then a 17 degree drop followed by ANOTHER 35 degree drop.
April 1995 from a Sunday to Friday saw a 20 degree jump, a 17 degree drop, a 12 degree drop, 22 degree jump then finally a 19 degree drop!
The bottom line is that historically, April is known for wild swings in temperature and weather. We just don't want to believe it because what's happening NOW is usually perceived as more significant than what happened in the past.