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
71.3
78
75
61
69
71
February
79.6
72
84
78
77
79
March
88.4
91
84
90
94
87
April
91.2
89
91
95
86
May
93.5
94
97
95
91
June
92.7
95
95
89
89
July
95.3
94
97
95
96
August
94.2
94
95
95
95
September
93.5
97
93
96
96
October
85.3
93
80
87
87
November
83.5
84
89
82
82
December
72.8
69
74
63
79
Average
87.3
80.9
88.7
88.6
87.9
87.4
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.