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
73.2
100
87
99
98
98
February
74.2
100
100
100
97
100
March
66.9
96
99
86
93
93
April
68.6
100
87
95
99
May
69.0
95
97
96
100
June
67.3
93
93
96
99
July
70.2
97
98
100
98
August
70.9
95
100
98
99
September
72.0
100
100
100
99
October
80.8
100
95
81
100
November
82.6
99
99
97
99
December
84.1
99
100
99
94
Average
75.6
98.6
97.0
96.0
96.1
98.0
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.