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
93.2
100
96
87
100
86
February
92.0
99
91
85
91
92
March
91.9
95
91
91
93
85
April
96.4
98
97
94
95
97
May
94.7
99
84
96
92
June
0
0
0
0
July
83.4
61
100
89
99
August
94.1
93
100
96
96
September
97.0
94
99
95
99
October
97.5
97
98
96
96
November
96.2
98
97
98
100
December
0
0
0
0
Average
94.8
97.1
93.8
94.1
94.7
94.4
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.