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
84.3
79
95
91
100
65
February
84.3
72
71
94
66
69
March
97.1
93
96
98
96
99
April
97.4
95
97
96
99
May
96.4
98
93
98
98
June
93.0
93
91
94
94
July
92.8
94
98
96
89
August
89.4
94
89
96
88
September
90.7
93
93
95
88
October
93.1
97
95
93
90
November
97.4
96
98
97
98
December
87.8
85
99
84
99
Average
90.8
80.7
92.3
94.4
93.6
89.4
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.