Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
56.9
65
51
45
52
65
February
72.4
65
75
79
65
82
March
84.3
89
85
85
88
83
April
88.7
76
85
88
99
May
94.3
96
99
95
93
June
93.4
92
96
86
87
July
95.0
96
96
89
98
August
93.5
91
93
89
96
September
91.5
96
91
90
93
October
83.3
85
88
84
76
November
59.7
70
70
51
61
December
58.1
66
44
41
45
Average
82.6
74.3
84.2
85.4
79.6
84.4
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.