Wow can it be August all ready? Seems like just yesterday it was January 1st and we were just starting the “New Year” The Grand Rapids (1981-2010) mean average temperature for August is 70.1° I would look for that to increase when the updated averages come out. On average there is around 3.6” of rain fall and the sun shines about 70% of the time. The warmest August of record at Grand Rapids is 77.1 in 1947. The coldest August of record was 65.0 in 1992. The Hottest day was 102 on August 6, 1919 and the coldest low was 39 on August 30, 1976. The last time it has reached 100 in August at Grand Rapids was in 1964. The mean number of 90 days for August is 3 but there have been 29 years when August has not had any days of 90 or better. And that was the case just last year. The most 90 days happened in that hot August of 1947 when it reached 90 of 17 days. In 2nd place is 1988 with 13 the most in the last 30 years was 2007 with 8. For a comparison this July will have had 10 days of 90 or better at GR. Here is a list of the top 5 warmest August’s at Grand Rapids 1.1947-77.1 2. 1906-76.3 3. 1937-76.0 4 1959 -75.5 5. 1955-75.0. The top 5 coldest 1. 1992-65.0 2. 1915-65.1 3. 1903-65.3 4. 1927-65.7 5. 1904-65.9.
Here is the latest CPC outlook for August 2020.
Here is a kind of fun fact. While this July is going to end up with a mean temperature well above average. Most of the heat was in the first 10 days of the month. During the first 10 days of July the average H/L here at Grand Rapids was 91.4/67.6 for a mean of 79.7. But between the 10th to the 30th the average H/L has been a more normal 83.4/65.1 for a mean of 74.5 while still warmer than average it still have been more conformable then the first 10 days of the month. Now that said Barry brought up something that kind of surprised me. And that is we have had now 36 days in a row of 80 or better. Now this has not happened very often here at Grand Rapids. There is a good chance that this month will see all 31 days of 80 or better and that has only happened once and that was in 1955. The longest string of days of 80 or better that I can find was 52 in 1921 (from June 9th to July 30th) in 1988 there were 45 days in a row from July 12th to August 17th and in 1955 there were 42 days in a row from June 27th to August 7th in 1916 there was a string of 34 days.