Tuesday, August 1, 2017

Grand Rapids, Michigan, climate update for July 2017

Mean average temperature was 72.5 degrees F in July 2017 in Grand Rapids, Michigan. The mean is 72.2. The average to date is 50.0. The mean to date is 46.7.

The lowest minimum temperature was 53. The mean is 49.

The highest maximum temperature was 90. The mean is 94. July is the warmest month of the year by average temperature (above), so it's not going to be a very hot summer since it's all downhill from here.

Precipitation was 1.12 inches. The mean is 3.13.

Cooling degree days came to 240, which is the mean. The total to date is 432. The mean to date is 422.

I have corrected my climate update for June 2017. Either I or NWS reported incorrect figures for lowest minimum temperatures and for cooling degree days, not sure which. I noticed the discrepancy today and fixed it. May 2017 checks out OK.

The three month Oceanic Nino Index value has averaged -0.32 over the last eleven months, climbing to +0.5 in the last measurement period in April-May-June after a weak cooling event in the Pacific lasting five months.  

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