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
90.3
95
84
97
91
96
February
88.7
87
86
80
92
93
March
83.3
94
81
74
85
85
April
85.7
87
81
84
86
May
81.8
86
74
80
76
June
83.6
79
84
79
86
July
88.2
93
86
84
86
August
95.0
95
94
96
98
September
95.6
97
96
90
95
October
91.8
95
89
93
95
November
90.1
94
94
89
94
December
88.6
91
92
85
86
Average
88.5
91.9
88.3
86.2
86.7
88.4
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.