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Iowa Preliminary Weather Summary
By: Justin Glisan, Ph.D., State Climatologist - 10/14/2020

The first full week of October brought unseasonable warmth to the state with positive departures of up to 10 degrees in western Iowa. The statewide average temperature was 61.6 degrees, 8.2 degrees above normal. Dry conditions prevailed across Iowa as well with only a few stations reporting very light rainfall amounts. The lack of rain around the state led to weekly precipitation departures on the order of 0.50 inch to 0.70 inch.

Southerly winds built back into Iowa through Sunday (4th) afternoon under sunny skies. Highs reported in the afternoon remained cooler than average, generally in the upper 50s and low 60s; the statewide average high was 60 degrees, seven degrees below normal. Monday (5th) was a windy day across Iowa as southerly winds increased in strength ahead of a weak cold frontal passage. Morning lows, under clear skies, were up to 16 degrees below average as stations in northern Iowa reported upper 20s and low 30s with the statewide average at 35 degrees, 8 degrees below normal. Extremely spotty showers were observed in eastern Iowa during the afternoon hours, though few stations reported any rainfall. Daytime highs rebounded into the mid 70s northwest to mid 60s southeast, where the front was still present. Winds died down and shifted to a westerly direction overnight into Tuesday (6th) as temperatures dipped into the low to mid 40s. Afternoon highs pushed into the upper 70s and low 80s under sunny skies. A dome of high pressure over the upper Midwest produced quiet and pleasant conditions Wednesday (7th) and Thursday (8th) as highs on both days remained in the upper 70s with some spotty low 80s. Hazy conditions were also reported at various stations across the state.

Morning lows registered on Friday (9th) were warmer than average as a warm front lifted northeast through the state, pushing temperatures into the upper 50s and low 60s; Primghar (O'Brien County) reported a low temperature of 62 degrees, 19 degrees above average. A warm morning transitioned into an unusually hot October day as highs in the afternoon pushed into the mid to upper 80s across much of Iowa; the statewide average high came in at 83 degrees, 17 degrees above normal. Skies remained mostly clear overnight with some dense fog forming in southwestern Iowa in the early hours of Saturday (10th). Morning lows stayed unseasonably warm with low to mid 60s reported in eastern Iowa. A cold front dropped southeast through Iowa during the day moderating temperatures under clear conditions. Afternoon highs remained near seasonal across northern Iowa but in the upper 70s in the south. Cloud cover increased over the eastern half of Iowa overnight into Sunday (11th) as easterly winds gradually shifted to a southeasterly direction. As the sun rose, stations around the state reported lows in the 50s with upper 40s observed in eastern Iowa.

Weekly precipitation totals ranged from no accumulation at almost all Iowa stations to 0.02 inch at Maquoketa (Jackson County). Ames (Story County), Red Oak (Montgomery County) and Shenandoah (Page County) reported the week's high temperature of 88 degrees on the 9th, on average 20 degrees above normal. Clarion (Wright County) and Northwood (Worth County) reported the week's low temperature of 27 degrees on the 5th, 14 degrees below normal.

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