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
93.1
92
99
91
99
93
February
90.1
92
89
84
92
88
March
91.7
92
93
91
93
91
April
92.7
93
91
98
89
May
92.7
87
81
97
95
June
0
0
0
0
July
90.9
83
96
85
94
August
95.4
96
93
96
100
September
95.9
92
98
95
97
October
96.7
99
99
91
96
November
95.9
100
97
97
90
December
96.7
100
91
100
100
Average
93.4
92.1
92.8
91.5
94.5
93.7
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.