Grand Rapids area tree fruit update – July 19, 2022
Hot, dry weather for the remainder of July.
Weather and phenology update
Over the past week, the Grand Rapids, Michigan, area continued to have very warm conditions. Temperatures were near 80 degrees Fahrenheit most days with overnight lows in the upper 50s and 60s. As of July 18, the Michigan State University Sparta Enviroweather station has accumulated 2027.1 degree days base 42 F (DD42). This is slightly above average, which is 1899.6 DD42, and approximately four days ahead of normal.
Across most of the area, there was a significant amount of rainfall on Monday, July 11, and Friday, July 15. Accumulation has been quite variable between locations, ranging from approximately 0.1-1.5 inches total over the course of the week.
Expect a hot week, with highs in the mid to upper-80s and lows in the mid-60s. There is a slight chance of showers for most of the week, but with little accumulation expected. Over the weekend, scattered storms and rainfall are likely, with possibly 0.5 inch of rainfall. Rainfall is not keeping up with the ET demand, keep irrigation on trees where possible, especially in new plantings.
Tree fruit is continuing to put on size. Apples are sizing well and there is a very good potential crop. Hand thinning and summer pruning is underway in most places. Some very minor sunburn has been observed. Peaches have begun harvest on early varieties. Predicted harvest dates can be found on the Enviroweather model. For the most part, they are close to average harvest dates this year, with earliest varieties expected to begin harvest at the end of July, other varieties beginning early to mid-August.
Degree day accumulation at Enviroweather stations in the Grand Rapids area
|Weather Station||Degree Days Base 32 from Jan. 1||Degree Days Base 42 from Jan. 1||Degree Days Base 50 from Jan. 1|
|Aetna - Fremont||3094.4||1973.5||1261.6|
|Sparta 20m Tower||3183||2031.2||1303.2|
|Sparta - North||3199.6||2049.4||1318.7|
|Average DD from Sparta historical data for Jan. 1 to date||3089.5||1899.6||1180.6|
|Comparative Date of Averages @ Sparta||20-Jul||22-Jul||24-Jul|
|Days +/- Average @ Sparta||+2 days||+ 4 days||+ 6 days|
For these updates, we used averages for 1997-2021 from the Michigan Automated Weather Network (MAWN) to represent normal conditions. Weather data was gathered from MSU Enviroweather.
More information and reports on normal weather conditions and departures from normal can be found on the NOAA Climate Prediction Center website, NOAA U.S. Climate Normals website, NOAA Climate Normals Quick Access Page (which may be searched by region) and Midwest Regional Climate Center website.