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
77.9
72
81
67
91
73
February
84.8
83
84
88
75
89
March
96.7
97
96
90
100
95
April
98.4
99
98
100
100
May
97.4
93
99
98
100
June
99.7
100
99
100
100
July
99.6
100
100
100
100
August
99.6
100
100
100
99
September
99.0
100
98
99
100
October
90.1
98
99
91
91
November
81.2
95
87
74
66
December
76.3
86
73
71
77
Average
91.5
84.8
95.1
93.6
93.2
92.6
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.