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
76.4
93
84
99
79
52
February
89.4
97
95
98
68
100
March
98.0
96
100
99
100
99
April
99.4
98
100
100
100
May
98.4
97
99
99
99
June
99.1
98
100
100
98
July
99.7
100
100
100
100
August
99.7
99
100
100
99
September
98.8
100
97
100
98
October
91.8
96
75
99
95
November
78.6
91
77
76
57
December
75.3
69
65
80
68
Average
93.8
95.0
95.0
94.7
93.5
91.2
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.