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
78.4
76
86
73
91
74
February
81.5
91
63
75
92
68
March
88.0
81
91
76
90
87
April
95.4
95
96
96
93
May
98.3
97
97
99
100
June
98.1
97
97
100
99
July
99.1
99
99
99
100
August
98.9
100
99
98
100
September
98.8
100
100
98
99
October
96.8
96
98
98
100
November
93.2
96
91
93
95
December
81.3
87
67
83
84
Average
91.9
82.6
92.9
90.6
95.3
92.1
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.