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Reagan National logs warmer than normal October
October 20, 2026
Mean daily high and low temperatures at Washington Reagan National Airport, 14 km from this area, ran 1.4°F and 3.8°F above normal over the past 30 days, averaging 74.3°F and 59.3°F respectively. October temperatures continue warmer than the 1991-2020 normal for these calendar days.
Threatened damselfly and dragonfly seen heading south
October 20, 2026
(threatened damselfly) observed October 8-13 in Arlington and Kensington. Tiger Spiketail (threatened dragonfly) recorded October 13. These species migrate southward in autumn; their October presence marks the annual fall movement to overwintering grounds.
Pollution-sensitive caddisflies found in Potomac tributaries
October 20, 2026
and net-spinning caddisfly larvae recorded through October 16 in tributaries including the Potomac River system. These pollution-sensitive larvae require dissolved oxygen above 6 mg/L and indicate that some stream reaches maintain acceptable water quality despite regional impairment designations.
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