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
91.5
79
93
95
97
85
February
90.5
91
82
95
84
96
March
93.2
94
92
91
93
94
April
93.4
92
92
97
97
May
82.8
75
77
91
91
June
87.0
88
90
85
87
July
83.1
81
82
78
93
August
89.4
87
86
91
93
September
92.9
83
95
86
95
October
95.2
98
91
89
94
November
96.3
99
95
94
95
December
93.9
95
97
96
100
Average
89.7
89.9
86.3
87.7
89.0
93.3
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.