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
91.3
87
95
98
89
94
February
89.9
88
91
92
88
90
March
91.5
97
86
86
88
98
April
93.9
95
97
92
96
May
91.7
88
94
94
93
June
89.4
96
87
84
77
July
97.0
99
98
100
94
August
86.8
90
89
87
78
September
82.6
77
65
97
66
October
93.4
92
94
96
90
November
91.3
94
94
87
94
December
89.6
95
88
90
87
Average
90.6
90.3
91.5
90.0
90.9
88.2
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.