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
54.6
66
57
66
77
25
February
67.8
59
75
63
86
34
March
97.0
99
98
99
95
97
April
97.2
98
97
97
98
May
97.3
98
95
98
98
June
96.2
95
97
99
96
July
95.0
93
93
99
95
August
93.8
92
87
98
98
September
93.4
92
83
95
97
October
96.9
96
96
99
97
November
97.3
98
100
97
97
December
71.0
54
96
73
95
Average
87.0
75.2
87.7
89.5
93.0
86.7
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.