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
74.2
79
95
69
90
66
February
80.8
84
85
85
89
88
March
86.5
91
86
92
85
92
April
91.4
95
98
84
95
May
91.6
97
90
97
88
June
91.9
94
98
95
89
July
96.4
99
99
94
91
August
98.5
100
99
98
98
September
92.7
93
90
97
94
October
93.8
98
95
94
99
November
88.0
99
85
92
95
December
79.7
87
87
92
76
Average
88.5
84.9
93.9
90.9
92.2
89.4
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.