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
71.5
76
72
66
54
69
February
84.3
77
74
83
81
92
March
90.4
91
85
93
91
90
April
91.8
84
94
92
96
May
93.5
89
94
97
100
June
94.6
93
98
89
98
July
94.6
92
99
87
96
August
93.5
88
96
92
97
September
90.3
91
88
91
93
October
92.8
92
95
91
96
November
81.1
82
86
71
83
December
70.9
73
59
63
77
Average
88.3
81.7
85.5
90.0
86.0
92.1
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.