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
78.9
85
85
67
76
81
February
89.8
89
88
93
90
94
March
91.4
92
88
93
93
97
April
94.6
92
96
94
99
May
95.8
95
98
95
100
June
96.8
98
99
92
97
July
96.2
96
98
91
97
August
95.6
94
98
93
98
September
94.3
96
98
94
95
October
94.7
95
97
93
98
November
86.2
89
92
76
91
December
77.2
75
69
76
85
Average
91.8
89.2
92.0
93.7
89.9
95.1
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.