Unofficial start to summer

Memorial Day in the United States is the "unofficial beginning of summer". Victoria Day in Canada is the "unofficial beginning of summer".

Daily highs/lows (in Farenheit) in Edmonton, Alberta during the unofficial start of summer:
Friday May 15th: 35.1 - 55.4
Saturday May 16th: 42.8 - 64.4
Sunday, May 17th: 46.4 - 68.0
Monday, May 18th: 28.4 - 53.8

Daily (expected) highs/lows (in Farenheit) in St. Louis, Missouri during the unofficial start of summer:
Friday, May 22nd: 46 - 67
Saturday, May 23rd: 47 - 72
Sunday, May 24th: 44 - 70
Monday, May 25th: 51 - 73

Maybe we need to drop this "start to summer" label