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
77.7
91
51
75
93
February
94.0
98
95
88
95
March
88.1
95
98
72
88
April
94.1
100
83
100
May
91.8
97
82
94
100
June
94.4
99
86
94
100
July
84.2
100
73
87
79
August
93.8
100
82
97
96
September
88.9
76
91
99
91
October
86.6
97
66
93
91
November
88.6
92
87
87
89
December
82.8
94
82
80
76
Average
89.8
94.7
92.1
80.5
92.2
89.5
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.