You should not receive a booster vaccine if you had a life threatening allergic reaction after the first shot. Keep track of any and all side effects you have after receiving this vaccine. If you ever need to receive a booster dose, you will need to tell your doctor if the previous shot caused any side effects.
On average, Santorini in December receives an average of 74.5mm of rainfall divided between 11 wet days, whilst January is subject to an average of 70.5mm of rainfall which is spread out between ten rainy days.
The weather in Santorini on May is always good. The average temperature is about 19 degrees. Late in the afternoon and evening it's cold but not too much. Dependants on you and in what weather you are used to (like the country you are coming from). October most of times is hotter than May.