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
79.7
70
91
68
84
88
February
84.9
80
89
80
83
90
March
91.0
93
89
95
96
87
April
93.3
94
86
99
89
May
92.8
94
96
92
89
June
93.7
96
95
94
91
July
96.0
96
98
96
96
August
97.1
96
97
98
95
September
94.2
94
95
92
92
October
89.9
92
92
94
89
November
88.5
91
90
84
97
December
74.8
61
81
79
84
Average
89.7
82.1
91.2
90.8
91.6
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.