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
93.7
99
90
92
93
95
February
96.1
97
95
95
94
99
March
96.3
97
99
92
100
97
April
88.7
100
77
80
92
May
83.2
100
72
66
94
June
89.6
99
81
94
94
July
91.3
100
85
92
83
August
91.8
99
84
89
97
September
87.8
94
93
71
89
October
88.1
86
89
81
87
November
96.3
97
97
95
92
December
96.0
98
94
95
94
Average
92.3
97.8
96.1
87.7
87.4
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.