It’s tough for me to compare to previous years because I switched my soil temps up last summer. I used to keep one at 6”, but now I have them at 4” and 8”. But 6” usually is the average of the 2 since 4” fluctuates with sfc heating and cooling and it works its way downward to 8”.
edit: Just peeked at last year. The 1st 10 days of June torched and 6" got into the low 70s. Then during the cool down mid month it was around 65F. Late month we had a heat wave and it warmed back up to 70-75F. Honestly we're not much lower right now versus previous years and 2018 was actually consistently a couple degrees cooler in early June.