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
96.4
98
97
100
70
100
February
95.8
100
99
100
11
97
March
93.5
86
97
100
81
100
April
96.5
98
99
86
85
May
91.1
97
94
22
97
June
96.1
99
98
84
78
July
95.6
98
97
63
94
August
93.3
97
90
61
100
September
92.0
96
94
78
51
October
93.8
96
92
91
82
November
92.2
96
93
66
67
December
93.5
99
96
61
83
Average
75.8
94.4
97.2
95.5
54.7
86.0
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.