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
92.4
96
88
93
94
94
February
90.2
83
89
87
98
91
March
89.8
76
93
86
95
93
April
89.1
89
80
91
98
May
88.3
90
84
81
87
June
86.2
84
80
89
82
July
84.2
79
87
91
72
August
93.9
93
99
83
98
September
90.9
100
90
91
96
October
93.9
100
97
97
96
November
94.2
93
84
98
95
December
95.3
96
99
100
97
Average
89.9
84.0
90.6
88.2
91.8
91.0
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.