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
75.8
87
63
93
80
87
February
81.9
88
96
97
72
98
March
88.3
83
95
94
91
95
April
94.6
95
82
98
97
100
May
98.0
100
100
99
99
June
98.6
100
99
98
98
July
99.1
99
100
100
100
August
98.8
98
98
98
100
September
96.9
100
97
100
98
October
90.9
99
99
98
87
November
73.7
91
66
82
75
December
64.4
79
51
67
43
Average
90.2
88.6
93.0
93.7
92.0
92.0
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.