The sun in northern countries in summer is less intense?
Come to Australia during the summer and watch how quickly you burn outside without sunscreen.
Yes, because it's lower in the sky so more of the UV in it gets absorbed by the atmosphere before reaching the ground.
For example, in Florida in the summer, the sun is close to directly overhead at noon. In Scandinavia in the summer, the sun is only about halfway up the sky from the horizon at noon.
less intense than in countries near equator, not less intense than winter
Yeah, kinda.
I moved from Indiana to Norway - Trondheim, which is about in the middle of the length of Norway. During the summer, I can read outside at night even though the sun technically goes down for about 4 hours in June. It never gets darker than twilight. A few clouds means you might just have sunset all night. The sun does get surprisingly hot and very warming if we happen to have a sunny day. Jacket in the shade, short sleeves in the sun even though it is 18C/65F.
The reason for this is that the sun is at a low angle, so it hits more of your body than it does when the sun is overhead - like you'd get in Australia. This also means that while you need some sunscreen during the day - from about 10 to 5 - it doesn't burn as much. It is less intense in that way - but it just feels different.
During December, days are 4 hours of very weak light.