Very warm air squeezed out ahead of a frontal zone as it dropped southward and stalled near Interstate 90 overnight, and as the front began to lift northward as a warm front on Tuesday, the strong southwest winds and strong May sunshine aided in maximizing the heating potential across the area.
Here is a list of high temperatures from the area this afternoon:
|White Lake, SD||96|
|Storm Lake, IA||95|
|Le Mars, IA||95|
|Orange City, IA||95|
|Sioux Center, IA||95|
For Sioux Falls, SD, the high temperature was 95 degrees.
|Last May 100 degree day||May 25, 1967 (100)|
|Last 100 degree day||July 30, 2006 (100)|
|Last May day this warm||May 25, 1967 (100)|
|Last time this warm||August 3, 2008 (99) *around 4 am|
For Sioux City, IA, the high temperature was 97 degrees.
|Last May 100 degree day||May 15, 2001 (101)|
|Last 100 degree day||July 31, 2006 (101)|
|Last May day this warm||May 28, 2006 (98)|
|Last time this warm||July 17, 2007 (98)|
For Huron, South Dakota, the high temperature was 98 degrees.
|Last May 100 degree day||May 31, 1934 (101)|
|Last 100 degree day||July 23, 2007 (101)|
|Last May day this warm||May 1, 1959 (99)|
|Last time this warm||July 23, 2007 (101)|
May 1934 is widely regarded as the warmest May on records in this part of the country. You can find more information about the conditions during May 1934 by following this link.