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Meteorological Fall

Meteorological Fall

We have now put meteorological summer behind us and have now entered the fall season. The next few weeks there is still a chance of some warm days but after the 15th to the 20th there will be a noticeable decline in both daylight and temperatures.

Here are some averages for Grand Rapids for meteorological fall. The current 30-year average each of the fall months are September, Average mean temperature 63.5 Precipitation 3.43” snow fall 0. October average mean temperature 51.5 Precipitation 4.02” snow fall 0.3” November average mean temperature 40.0 precipitation 3.10” snow fall 7.1” The shorter 15-year average temperature for September is 64.2 precipitation 3.38” snow fall 0. For October the average temperature is 51.7 precipitation 5.04” and snow fall 0.2” For November the average temperature is 40.3 precipitation is 2.50” and snow fall 5.0” now looking back at the old 1981/2010 averages September old mean was 62.8 precipitation 4.28 snow fall 0. For October temperature 51.0 precipitation 3.26 snow fall 0.5 for November temperature 40.1 precipitation 3.51 and snow fall 6.8” over the last 40 years the temperature has moved upward, and precipitation has been more up and down. Snow fall has decreased a little.

The current 30-year average mean for meteorological fall at Grand Rapids is 51.6 the new 15 year average is 52.1.  The record warmest autumn was in 1931 with a mean of 57.5° The coldest was in 1976 with a mean of 45.8. The wettest was in 1988 with 17.68” the driest was in 1956 with just 2.59” the most snow fall was in 2014 with 31.0” (all of which fell in November) the least snowfall was a trace in several years the last time was in 1984.

For the month of September as stated above the 30 year average mean is 63.5 the 15 year mean is 64.2. Since 1892 the warmest mean is 69.0 in 1931 the mean was 68.1 in 1933 and 1908, in 1921 the mean was 67.9 in 1906 it was 67.5 and in 2015 it was 67.2 for the top 5 warmest. The coldest mean in September is the 56.2 in 1918 with 56.4 in 1974, 56.5 in 1993, 56.9 in 1975 and the 58.1 in 1949 being the 5 coldest. Last year the mean was 65.6. In the last 5 years 4 of the 5 have been warmer than average. The hottest day in September was the 98 on September 2nd 1913. It reached 97 in 1954, 1953 and 1939 and 96 in 2017, 1960 and 1927 for the hottest days in September. Over the years it has reached 90 or better in 51 years so we can still get a hot day in September. The most days of 90 or better is 7 in 1931 there were 6 days in 2017. The last time it reached 90 or better in September was in 2018. The record low for the month is a cold 27 on September 28th 1991. It has gotten below 30 in September a total of 7 years and 32 or below in 24 years and below 35 (for a frost?) a total of 34 years. I have a picture on my phone of frost on September 19, 2020 when the official low of 36 was reported. The wettest September was in 1986 when a total of 11.85” of rain fell at Grand Rapids and the driest was in 1979 when just a trace was reported.

Slim

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Mr. Negative
Mr. Negative

ADA – Well…this is an unexpected, very windy, heavy rain, Thunderstorm 😉 Sprinklers off.

Mr. Negative
Mr. Negative

6/10 of an inch in 30 minutes. Followed by…another 30 minutes of very low, very dark, dry clouds. Enjoyed the “atmosphere” though.

Barry in Zeeland
Barry in Zeeland

Thanks Slim. Good read as always. Do you know how many 80 degree days we’ve had this year? Seems we’ve had a lot, but maybe that’s because I’ve spent the whole Summer outside cleaning salvaged items from our fire.