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
78.0
88
83
77
73
83
February
88.7
96
87
99
85
97
March
94.5
92
97
98
94
98
April
95.5
95
93
97
100
May
95.5
97
96
97
98
June
95.8
100
99
95
84
July
97.2
99
98
93
98
August
96.9
96
96
96
96
September
94.6
97
95
95
90
October
89.7
96
94
82
91
November
72.9
96
79
60
62
December
77.8
89
53
69
68
Average
91.4
91.9
95.2
92.7
88.4
90.5
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.