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
74.6
87
87
57
70
82
February
87.6
81
90
89
94
91
March
93.9
95
95
96
96
93
April
95.2
92
93
98
97
May
94.1
95
100
94
95
June
95.0
95
94
94
96
July
96.5
97
100
93
97
August
97.9
97
99
97
99
September
93.6
97
94
88
91
October
88.6
94
90
94
90
November
81.2
86
80
68
94
December
74.3
77
74
64
80
Average
90.4
88.3
92.8
91.0
89.0
92.7
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.