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Poweshiek County had its 5th wettest September on record
October 22, 2026
Poweshiek County received 9.8 in of rain in September 2026, 5.9 in above the 1901-2000 normal of 3.9 in, ranking 5th wettest September of 132 on record. This exceptional rainfall follows the early-September dry spell and represents major moisture surplus this fall.
Grinnell logs a warm stretch into late October
October 22, 2026
Grinnell 3 SW weather station 3 km away recorded a mean daily high of 71°F, 4.3°F above normal, and mean daily low of 48.9°F, 8.5°F above normal over the past 30 days. Above-normal temperatures persist well into late October, extending the warm autumn pattern.
Silphium borer moth found near Grinnell
October 22, 2026
A (Papaipema silphii) was recorded on 2026-10-03 in Grinnell during its adult flight period. This threatened prairie specialist depends on Silphium plant roots for larval development and occurs in fragmented mesic prairie habitat. The observation indicates functional prairie habitat remains in the area where this rare Midwestern moth can persist.
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