If you would have used a more honest color scale, this map would show that basically molto of the map, apart from the streak on the artic and the one in east Europe, are reasonably on average, with what I can guess (it's really hard to be determined in your messy yellow to black color gradient) is ±5°C. Which on a single day is honestly incredibly consistent. Though again, really hard to comprehend since yellow goes to orange to dark orange in a very small degree range.