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
74.1
68
77
89
79
52
February
89.4
77
96
93
91
88
March
98.3
97
100
96
98
99
April
97.4
99
97
96
96
May
98.5
99
99
100
98
June
99.2
99
100
99
100
July
99.4
100
99
100
99
August
99.7
100
100
100
99
September
99.1
99
99
99
100
October
97.0
97
100
96
99
November
91.0
96
96
90
74
December
69.5
75
63
59
77
Average
92.5
81.6
95.7
95.8
93.6
91.9
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.