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
96.4
99
98
90
99
99
February
96.3
90
98
95
94
99
March
94.6
92
96
95
96
95
April
94.0
94
96
92
94
May
92.3
92
94
95
93
June
83.5
84
86
86
66
July
86.9
95
78
96
92
August
85.5
92
88
74
91
September
86.2
86
96
70
92
October
92.3
92
91
92
91
November
94.2
97
94
87
96
December
96.6
92
100
99
98
Average
92.3
93.9
93.1
91.9
90.3
92.8
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.