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
71.4
88
87
62
72
66
February
83.9
92
86
94
83
92
March
95.1
98
98
100
96
94
April
93.5
96
96
97
99
May
97.0
99
100
98
99
June
97.0
95
99
99
93
July
97.3
97
99
96
98
August
97.9
100
99
95
98
September
94.5
99
94
95
91
October
91.1
99
91
94
88
November
82.6
88
73
84
79
December
74.7
81
86
60
88
Average
91.5
93.1
94.6
92.9
91.2
91.8
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.