We wrapped up spring and started meteorological summer with some lovely, if a bit drier, weather. Average temperatures this week ranged from the low 60s in northern Illinois to the mid-70s in southern Illinois, between 1 and 4 degrees above average. Low humidity allowed daytime temperatures to regularly reach into the upper 80s, while nighttime temperatures cooled well into the 50s. Some of the more impressive nighttime lows this week included 44 in Waukegan and 45 in Normal.…