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
73.6
75
89
73
64
75
February
80.1
84
76
90
77
84
March
87.9
91
81
97
90
89
April
92.6
98
92
91
93
May
95.6
97
92
94
97
June
98.3
98
99
100
100
July
94.7
91
97
98
95
August
96.3
97
99
100
95
September
89.7
91
75
91
98
October
85.0
72
80
90
93
November
71.8
77
65
70
71
December
72.1
76
79
71
84
Average
88.4
84.7
88.8
89.2
89.5
91.6
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.