July's climate so far:
Rainfall in July has been highly variable, but with some observers already reporting above normal totals for the month. In the northwestern portion of the state Newfolden (Marshall County) has already received 6.33 inches; in the north-central part of the state Aitkin reports 5.24 inches; in central Minnesota Milaca reports 5.13 inches and Mora reports 5.26 inches; in southern Minnesota Farmington reports 5.85 inches and Hastings 5.29 inches.
The outlook favors above normal rainfall during the 2nd half of July for much of the state, so perhaps most observers will see a sizable increase in monthly rainfall over the next two weeks.
New Seasonal Climate Outlook:
Weekly Weather Potpourri:
MPR Listener Question:
Speaking of high dew points, during the month of June Twin Cities residents only experience one day with a dew point that high. But so far in July we have already recorded dew points of 70F or higher on five days, and I suspect there will be more.
Twin Cities Almanac for July 17th:
MSP Local Records for July 17th:
MSP weather records for this date include: highest daily maximum temperature of 99 degrees F in 1936; lowest daily maximum temperature of 65 degrees F in 2009: lowest daily minimum temperature is 52 degrees F in 1937 and 1976; highest daily minimum temperature of 79 F in 1936, 1942, and 2011; record precipitation of 3.71 inches 1997; and no snowfall has been recorded on this date.
Average dew point for July 17th is 62 degrees F, with a maximum of 81 degrees F in 2011 and a minimum of 38 degrees F in 1911.
All-time state records for July 17th:
Past Weather Features:
By far the warmest July 17th in state history occurred during the famous Heat Wave of 1936. The thermometers in 27 Minnesota communities reached the century mark or higher that day, which was the 12th day of a 14-day Heat Wave that killed over 900 Minnesota citizens.
Severe thunderstorms brought heavy rains and flash flooding over July 17-18, 1952. Especially hard hit were areas of east-central Minnesota where Aitkin and Moose Lake received over 10 inches. Portions of Highway 169 and Highway 61 were closed because of flooding and the Mississippi River rose above flood stage, a rare occurrence for mid-summer. As a result of this storm and others, some observers reported their all-time wettest July including Aitkin with 15.52 inches, Brainerd with 10.49 inches, and Moose Lake with Moose Lake with 13.21 inches.
July 17, 1997 brought severe thunderstorms to the Twin Cities area. MSP reported rainfall of 3.71 inches, with 3.50 inches at Richfield, and 4.00 inches at Hastings. The resulting flash flooding closed portions of interstate 35W at Diamond Lake Road, Highway 100 at St Louis Park, and Highway 52 near Inver Grove Heights.