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
95.1
90
94
100
97
94
February
92.1
93
91
92
89
89
March
85.5
87
81
86
91
84
April
89.6
90
85
87
88
May
90.4
85
87
94
91
June
0
0
0
0
July
96.5
100
100
88
100
August
92.2
95
93
95
92
September
93.0
89
82
96
98
October
97.2
95
97
98
95
November
97.4
97
99
98
99
December
0
0
0
0
Average
91.2
89.0
90.1
89.0
92.7
91.4
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.