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
48.4
57
48
33
68
30
February
66.3
57
63
69
74
55
March
96.9
99
97
98
88
99
April
95.5
95
92
96
99
May
93.7
93
93
93
95
June
89.4
94
90
87
82
July
88.0
93
80
95
89
August
90.9
94
88
92
97
September
87.8
84
83
90
93
October
89.9
93
93
98
91
November
91.1
93
93
92
93
December
59.4
50
86
59
83
Average
81.9
70.8
82.9
84.9
87.3
83.2
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.