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
88.6
90
95
80
92
86
February
93.9
95
93
95
96
94
March
94.0
98
95
96
87
97
April
96.3
98
100
98
96
93
May
94.8
90
96
95
99
June
93.4
96
88
94
97
July
96.1
99
95
93
99
August
95.6
93
92
98
92
September
95.0
94
99
89
88
October
97.4
98
98
95
100
November
96.4
100
96
99
92
December
93.0
95
99
93
99
Average
94.9
96.2
95.4
94.2
93.9
95.1
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.