Along with numerous chances for rain, the near term forecast looks rather warm with low temperatures starting off next week in the 60s! Iowa's weather during April can sometimes feel like winter and sometimes like summer! The featured chart looks into high temperature distributions over approximately the first half and second half of the period of record for Ames. A frequency distribution estimate is plotted for each period within the top panel and the difference between the two is plotted within the bottom panel. It is interesting to denote the tails of the recent period distribution having slightly higher frequency than the first half of the period of record. The right hand table lists out percentile values for both (please note the unfortunate tight visual spacing between the 99.5th and 99.9th values). Anyway, this autoplot can be used to compare various periods of your choice and you can see what changes have been observed.