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
75.4
84
74
74
77
73
February
88.2
77
93
97
92
96
March
94.4
96
95
99
94
April
96.8
95
95
99
96
May
95.5
95
99
98
96
June
96.0
99
97
95
98
July
98.2
97
99
95
100
August
98.1
96
100
100
99
September
95.6
97
95
94
97
October
90.4
95
91
93
88
November
81.9
84
79
73
93
December
75.4
83
70
72
75
Average
90.7
80.3
92.9
93.0
92.2
93.3
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.