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
79.4
90
80
96
82
58
February
90.8
100
98
100
71
100
March
97.3
97
100
96
96
100
April
98.6
97
99
99
100
May
98.7
98
100
100
98
June
99.2
98
100
100
98
July
99.7
100
100
100
99
August
99.5
100
99
100
99
September
98.7
100
98
99
99
October
88.6
93
75
96
90
November
76.3
97
72
76
63
December
78.5
78
66
83
63
Average
93.8
95.6
95.8
94.0
93.5
91.4
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.