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
77.0
70
77
76
73
82
February
83.8
74
76
94
92
95
March
88.6
75
94
84
91
98
April
92.9
87
85
96
90
May
95.5
94
93
99
97
June
96.8
97
96
98
97
July
96.7
93
92
94
100
August
98.3
98
100
100
99
September
97.2
96
96
98
100
October
94.8
84
94
98
99
November
82.6
46
87
85
94
December
73.3
65
93
69
73
Average
89.0
73.1
85.5
91.0
92.2
94.3
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.