Regarding the inverse relationship between blood pressure and outdoor temperature: it is the sun.
Goldstein
Mark R
MR
Mascitelli
Luca
L
Pezzetta
Francesca
F
D000367:Age Factors; D001794:Blood Pressure / Q000502:physiology* / Q000528:radiation effects; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000188:drug therapy / Q000503:physiopathology*; D013696:Temperature; D014466:Ultraviolet Rays; D014807:Vitamin D / Q000097:blood* / Q000627:therapeutic use
D014807:Vitamin D