What is the threshold of "35-degree plan" for ink weather? Where did everyone go to attend?

It is said that there is a threshold, but it is almost the same as no threshold. The rule of the activity is that if the ink weather shows that the temperature in your city exceeds 35 degrees, you can get a free Sprite coupon, and you can exchange it for an iced medium Sprite by showing the QR code at McDonald's. If the temperature is below 35 degrees, you can also get Sprite coupons by playing 10 seconds. I downloaded the ink weather APP and then participated every time. There are quite a few places to participate in this activity, such as Ink Weather APP, applet, official WeChat and Weibo.