The Palm Springs inflection date in 2017

Last week I wrote about some calculations to find the inflection point when the temperatures change from being better for warm-season grass (like bermudagrass, seashore paspalum, or zoysia) to being better for cool-season grasses (like perennial ryegrass, creeping bentgrass, or kentucky bluegrass). This inflection point can be represented on a chart as the minimum value for the cumulative sum of the warm-season growth potential (C4GP) subtracted from the cool-season growth potential (C3GP). Over a long time series, the median date for this inflection point in Palm Springs, California, is October 13.

At the time I made the calculations in late October, Palm Springs hadn’t reached the inflection point yet. I was curious when it happened, so I downloaded the most recent data today. It seems the inflection point this year, using data from the airport, happened on October 29.

inflection point 2017 palm springs

Micah Woods
Micah Woods

Scientist, author, consultant, and founder of the Asian Turfgrass Center