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
84.2
84
97
74
87
93
February
86.4
80
90
84
83
92
March
92.4
97
90
94
98
88
April
94.3
91
85
100
94
May
94.9
97
97
93
93
June
95.1
96
97
95
95
July
96.9
97
95
95
98
August
98.0
97
97
99
97
September
96.5
96
98
97
97
October
92.7
94
93
95
95
November
92.4
92
94
88
98
December
81.7
80
85
75
94
Average
92.3
87.7
93.4
92.0
93.0
94.5
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.