Season matters

Context Spring surveys average 2.6 points more than summer ones, so trends must compare like seasons.

Spring = March to June, summer = July to September, fall = October to February.

Many insects emerge as adults by mid-summer, which likely leaves fewer larvae in the riffles, and summer flows are lower and warmer. Comparing a spring survey with a summer one can show a change that is only the calendar, so every trend on this site compares like seasons.