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
91.6
87
93
89
93
94
February
92.5
94
89
95
94
85
March
89.0
95
88
94
87
84
April
93.7
97
95
90
89
May
96.7
100
93
97
92
June
0
0
0
0
July
89.7
91
99
76
100
August
96.2
94
99
97
97
September
96.9
97
100
99
97
October
96.5
96
96
96
99
November
95.3
94
100
98
94
December
0
0
0
0
Average
94.2
93.7
94.4
96.3
93.7
92.7
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.