The following quotes seem to be contradictory.
From skincancer.org, the amount of UVA radiations during daylight hours stays constant throughout the year:
UVA accounts for up to 95 percent of the UV radiation reaching the earth. These rays maintain the same level of strength during daylight hours throughout the year. This means that during a lifetime, we are all exposed to a high level of UVA rays. UVA can penetrate windows and cloud cover.
From https://www.washingtonpost.com, the sun angle varies over the course of the year:
We have seasons because the sun angle varies over the course of the year, and it varies because the Earth's plane of rotation is tilted by about 23.5 degrees from the plane of its orbit around the sun.
However, according to biointeractive.org (mirror), the angle of the sun impacts how much UVA one receives (which means that how much UVA one receives depends on the day of the year and the lattitude):
How do you explain the relationship between the UV Index and latitude? (In other words, why does UV intensity change with latitude?)
The answer has to do with the angle of Earth relative to the sun. Latitudes at the equator receive direct sunlight year-round. Latitudes toward the poles receive sunlight at an oblique angle, which means that the same amount of radiation is spread out over a larger area than at the equator.
These quotes confuse me as they seem to be contradictory to me (quote 1 contradicts quotes 2+3). Does the amount of UVA radiations one receives depend on the day ot the year? I don't mean the total amount accumulated over the day, but instead sometime during daylight.