Yes, in my opinion it is colder this year....but not sure why that is...maybe something to do with ocean currents temperatures near out coast??
We also live in Lima (Los Olivos) for 2 years now and we have noticed that it is a couple of degrees lower than 2018, coupled with misty rain almost every night/morning.
It doesn't really worry me much, but my Peruvian missus feels it badly.
I was kinda used to 1C to 5C winters back in Aussie, but after acclimatising here for 2 years, I am starting to feel the "chill" a bit.