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
63.1
79
63
58
58
73
February
77.1
73
84
90
69
88
March
87.3
85
85
93
86
94
April
93.5
98
85
95
94
100
May
94.9
96
99
94
96
June
96.1
97
96
97
91
July
96.1
97
99
95
99
August
94.9
92
93
95
98
September
92.2
96
92
91
93
October
82.6
79
87
90
81
November
63.6
85
61
53
67
December
59.4
64
36
48
56
Average
85.8
85.1
87.5
88.1
84.6
89.1
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.