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
69.2
93
79
76
75
43
February
82.2
90
87
95
70
90
March
93.8
98
93
96
89
95
April
97.2
95
96
98
100
May
97.0
97
97
98
99
June
96.2
96
98
98
97
July
95.8
96
100
98
96
August
96.6
96
95
99
97
September
96.6
98
93
96
98
October
89.2
99
82
92
84
November
73.5
93
62
66
56
December
70.9
77
83
72
67
Average
90.4
93.8
93.0
91.3
89.9
88.0
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.