String of Days with High Dew Points:
Thanks to dew points in the mid to upper 70s F, the Heat Index Values at St James, Willmar, Glencoe, Morris, Montevideo, and Litchfield exceeded 100F on Thursday this week, and such values may be observed in other places over the coming Labor Day weekend.
Provisional Climate Summary for August:
The month of August was drier than normal for most climate observers in Minnesota, though there were some locations that reported above normal rainfall thanks to heavy thunderstorms. On August 7th thunderstorms brought new record daily rainfall amounts to Morris (3.05"), Kimball (4.20"), and Big Lake (4.49"); on August 19th thunderstorms produced new daily rainfall records at Wolf Ridge (2.91") and at Madison (4.03"); and on August 23 thunderstorms brought record rainfalls to Hallock (2.60") and Warren (3.81"). Among those stations reporting more than 6 inches of rain for the month were: Big Lake (7.90"), Princeton (6.65"), Askov (6.60"), Wright (8.65"), Pipestone (6.68"), Worthington (6.49"), New Ulm (6.41"), and St Peter (6.53").
The month of August was windier than normal and brought a number of days with high wind gusts. Most locations reported wind gusts of 30 mph or greater on 6 to 8 days, and several locations reported wind gusts over 40 mph.
For the summer months of June through August, the statewide mean temperature was about 1F warmer than the historical average, and the statewide rainfall was about 0.5 inches above the historical average.
State Fair Weather:
As for weather during the State Fair: the historical average daytime temperatures are in the upper 70s to lower 80s F, with nights ranging from the upper 50s to low 60s F. It typically rains on 3-4 days during the fair. Current modeled forecasts favor near normal temperatures this weekend, warming to above normal conditions most of next week, with a cool down and chance of showers and thunderstorms for the Labor Day weekend.
Record climate values for the State Fair include: a high temperature of 104F on September 10, 1931; a low of 33F on September 13, 1890; and rainfall of 4.06 inches on August 30, 1977. Much more on the weather history of the Minnesota State Fair can be found at the DNR-State Climatology Office.
Appearance at Subtext Bookstore:
Weekly Weather Potpourri:
A new study published in the Proceedings of the National Academy of Sciences by UC-Irvine scientists finds that simultaneous droughts and heat waves are occurring with an increased frequency over the years since 1960. They examined global records of temperatures in the 90th percentile or higher from the historical records and extended periods when precipitation was 20 percent or less of the normal.
MPR Listener Question:
Twin Cities Almanac for September 4th:
The average MSP high temperature for this date is 76 degrees F (plus or minus 9 degrees F standard deviation), while the average low is 58 degrees F (plus or minus 7 degrees F standard deviation).
MSP Local Records for September 4th:
MSP weather records for this date include: highest daily maximum temperature of 98 degrees F in 1925; lowest daily maximum temperature of 59 degrees F in 1920: lowest daily minimum temperature is 39 degrees F in 1885 and 1974; highest daily minimum temperature of 73 F in 1960; record precipitation of 2.08 inches 1911; and no snowfall has been recorded on this date.
Average dew point for September 4th is 55 degrees F, with a maximum of 74 degrees F in 1960 and a minimum of 35 degrees F in 1974.
All-Time State Records for September 4th:
Past Weather Features:
During the Heat Wave of September 3-7, 1922, Minnesota citizens endured day after day of 90F temperatures (warm nights too) without the modern convenience of air conditioning. Many slept outside or on porches. Observers from all parts of the state set new daily temperature records, including 96F at Babbitt and 100F or greater at 16 other locations around the state.
Widespread thunderstorms brought heavy rains to parts of Minnesota over September 3-4, 1941. Many observers reported over 2 inches of rain, especially in the north. Hallock (Kittson County) reported nearly 5 inches with some local flash flooding.
Over the week of September 4, 1998 many portions of central and northern Minnesota were plagued by poor air quality as smoke from wildfires in Alberta and Saskatchewan passed across the region limiting visibility and causing bright red sunsets. A dry summer in western Canada contributed to a difficult wildfire season in Alberta where over 300,000 acres were burned by lightning caused wildfires.