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
87.8
95
91
95
78
87
February
91.3
92
93
92
92
90
March
91.5
94
91
90
92
98
April
91.7
94
95
92
97
May
90.6
86
98
99
96
June
94.5
95
98
95
86
July
97.0
99
94
98
96
August
93.3
99
91
84
97
September
88.3
98
87
91
84
October
91.0
78
96
96
87
November
90.9
78
97
92
86
December
90.5
97
95
89
87
Average
91.6
93.7
91.3
93.8
91.2
90.7
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.