Frequency of fog (min)	Visibility (m)
Frequency of fog (min)	1000 - 500	500 - 400	400 - 300	300 - 200	200 - 100	Below 100	Total
Jan.	348	21	6	0	0	0	375
Feb.	436	99	71	45	68	207	926
Mar.	154	26	26	63	363	28	660
Apr.	27	0	0	0	0	0	27
May	52	17	22	84	156	0	331