Has the max temperatures during winter months gone up significantly in Kerala

Last few days I was travelling across North Kerala (Kasaragod, Kannur and Kozhikode) and everywhere day time temperature crosses 33 degree celcius. Story is not different in central kerala either. It was 35 today at Muvattupuzha and Angamaly when I checked the thermometer reading on the car display People i met in these places could recollect much cooler winter months in their childhood 20-30 years ago. Apart from anecdotal experiences how much worse it is in terms of numbers? Are there any reliable sources of weather information for past few decades