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
81.2
87
85
91
77
74
February
87.6
94
91
81
85
92
March
90.7
91
86
93
96
89
April
94.7
98
98
95
87
May
93.5
95
97
90
92
June
0
0
0
0
July
89.5
65
92
96
97
August
91.3
91
97
90
94
September
93.3
93
87
98
95
October
82.9
87
87
87
79
November
75.8
79
76
76
90
December
92.3
100
100
100
100
Average
90.4
91.5
89.3
91.7
91.2
90.1
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.