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
78.7
83
78
80
88
70
February
81.2
74
80
83
81
82
March
87.5
79
92
81
93
98
April
95.8
91
94
97
100
100
May
98.7
100
100
100
100
June
98.7
99
100
98
100
July
97.6
99
97
99
99
August
97.1
98
98
94
100
September
95.1
92
96
96
96
October
92.1
86
98
90
94
November
86.6
84
79
93
88
December
78.0
75
79
83
76
Average
91.2
82.2
91.3
92.1
94.0
93.8
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.