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
96.0
100
94
90
94
100
February
94.5
100
93
98
94
91
March
95.6
95
99
93
95
95
April
93.5
87
94
98
100
May
94.9
93
86
99
99
June
89.7
82
90
93
98
July
82.2
59
81
83
97
August
82.2
66
92
97
98
September
89.5
64
95
89
98
October
93.2
89
94
87
100
November
97.5
95
100
96
100
December
98.9
99
100
99
100
Average
92.6
97.9
84.1
92.0
93.5
97.8
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.