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
94.9
95
96
96
93
95
February
97.6
98
99
98
96
97
March
93.7
99
94
99
88
90
April
92.3
93
89
92
96
May
91.4
96
97
88
92
June
97.7
93
99
100
100
July
85.4
97
79
73
87
August
80.4
95
69
73
88
September
84.3
87
86
88
78
October
75.6
72
86
79
80
November
89.0
88
91
95
95
December
94.5
99
84
99
91
Average
89.4
97.7
92.1
87.9
85.7
89.5
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.