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
89.1
95
93
93
87
91
February
91.4
97
88
89
89
96
March
93.4
96
99
89
92
96
April
96.9
97
99
98
100
May
94.5
97
90
98
91
June
93.4
95
98
91
99
July
94.8
94
97
95
99
August
88.9
92
93
87
93
September
97.9
92
99
100
100
October
98.8
97
100
100
100
November
93.9
99
86
98
97
December
95.1
93
98
95
95
Average
94.1
96.1
94.5
94.1
94.0
96.3
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.