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
70
66
66
62
59
February
74.1
63
75
87
78
72
March
79.6
74
71
90
78
87
April
92.6
91
95
96
95
May
94.6
97
97
94
97
June
97.2
96
99
99
95
July
96.5
97
96
95
98
August
94.4
90
94
98
95
September
89.6
90
94
90
83
October
84.5
78
86
88
87
November
72.7
78
83
79
72
December
61.1
61
51
57
65
Average
85.1
69.5
84.4
90.5
88.0
87.2
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.