If this month has started chilly, then June 1964 started COLD. In fact, three out of the first 4 days of the month brought record lows in the 20s including a 25-degree low on June 4th which is the coldest June temperature on record at the National Weather Service (NWS) site near Negaunee. Ironically, this is the last record low in the 20s at the NWS. The next record low in the 20s does not appear in the record book until early September.
The weather pattern of early June 1964 featured a deep upper-air trough extending from Canada into the Upper Great Lakes to start the month (Image 1 above). While the month began with record chill, the pattern flipped before the first week was over. On the 8th, the high reached 84 degrees in Marquette. June 1964 featured the first 90-degree high of the summer on the 9th. Despite the initial chill, the month ended a mere 1.3 degrees below average. The first four days in Marquette had highs only in the 50s, but the temperature reached 90 or above three times including a sweltering high of 96 on June 29th.
Our current pattern will feature a battle between high pressure to our northeast and an approaching low from the west. Rain from this system will have to overcome a lot of dry air left in place from the high-pressure system. It still looks like the best chance of a decent rain will be over western and southern portions Wednesday into Wednesday night. Areas over the eastern U.P. will only have a slight chance of showers. High pressure should reassert itself on Thursday and bring more dry, seasonably cool air to the entire Upper Peninsula for the end of the week.