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
76.1
82
78
84
73
84
February
87.0
93
94
99
88
93
March
90.8
88
94
95
91
93
April
91.8
88
91
94
98
May
92.2
90
95
94
94
June
95.5
99
98
95
88
July
97.1
99
98
94
98
August
95.2
95
92
94
97
September
94.4
97
94
96
91
October
89.4
95
93
86
90
November
74.3
84
90
57
76
December
77.4
90
50
74
76
Average
89.6
87.7
92.7
92.4
88.2
91.1
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.