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
65.8
59
79
82
85
60
February
79.1
72
85
85
72
89
March
83.4
78
82
85
84
90
April
91.1
72
95
98
98
May
84.7
58
95
84
96
June
89.2
94
94
79
87
July
82.6
93
89
86
94
August
78.1
56
98
97
97
September
77.6
0
85
95
90
October
75.5
0
90
87
91
November
63.3
0
77
77
82
December
62.3
81
57
62
Average
78.7
70.9
58.8
89.2
84.6
88.4
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.