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
64.0
63
22
76
60
70
February
83.9
79
83
94
91
93
March
95.3
87
98
89
97
98
April
96.5
91
95
100
96
May
96.5
94
87
100
100
June
97.6
91
99
100
100
July
96.4
91
91
97
100
August
98.0
97
99
100
99
September
96.4
95
97
95
100
October
95.5
89
96
97
100
November
77.3
75
88
66
66
December
54.7
49
40
69
36
Average
87.9
77.0
83.2
89.6
90.8
89.9
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.