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
81.9
91
43
72
92
97
February
90.3
93
92
95
88
86
March
92.8
95
90
92
92
April
93.5
97
86
99
98
May
92.0
98
78
97
98
June
97.8
99
91
99
100
July
97.6
96
93
100
100
August
97.5
96
90
100
100
September
98.8
100
97
99
98
October
95.8
97
94
96
99
November
90.7
85
91
96
90
December
79.8
74
82
83
77
Average
92.6
92.2
90.3
88.4
95.6
94.2
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.