PORTLAND's
DAYS WITH DENSE FOG

¹Normal values are the 1961-90 climatic normals. Greatest and least values are for the period of record 1949-May1999.

²Occurrence has repeated, with the most recent year of occurrence listed.

MOST CONSECUTIVE DAYS WITH DENSE FOG
...(1949-May 1999)

10 days... 1986 October 14^th -23^rd
8 days... 1949 October 18^th - 25^th
7 days... 1985 February 12^th -18^th
6 days... 1999 January 8^th - 13^th
5 days... 1993 November 7^th -11^th
5 days... 1993 December 16^th - 20^th
4 days... 1991 January 16^th - 19^th
4 days... 1984 December 5^th - 8^th
3 days... common occurrence during autumn and early winter

MOST CONSECUTIVE DAYS WITH LIGHT & DENSE FOG
...(1949-May 1999)

35 days... 1998-1999 December 23^rd - January 26^th
32 days 1997-1998 December 14^th - January 14^th
23 days 1996 November 6^th - 28^th
21 days 1997 October 19^th - November 11^th
20 days 1983 October 13^th - November 1^st
17 days 1996-1997 December 19^th - January 4^th
17 days 1993 November 5^th -21^st
16 days 1998 October 26^th - November 10^th
15 days 1998 November 19^th - December 3^rd
15 days 1983-1984 December 29^th - January 13^th
14 days 1997 February 18^th - March 3^rd
14 days 1995 November 21^st - December 4^th
13 days 1989 December 19^th -31^st
12 days 1997 September 29^th - October 10^th
12 days 1997 March 5^th - 16^th
11 days 1959 November 28^th - December 8^th
10 days 1995 November 10^th - 19^th
strings of 8 to 10 days are common, especially during autumn to early winter.