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
82.0
85
96
77
96
65
February
89.7
98
86
96
95
97
March
93.7
91
95
96
99
99
April
96.7
96
94
100
97
May
96.7
98
98
97
93
June
97.8
99
97
96
99
July
97.4
99
92
95
100
August
98.3
100
99
99
98
September
97.7
99
98
94
95
October
88.3
94
80
87
92
November
78.5
93
84
73
58
December
76.6
79
66
73
79
Average
92.4
91.2
95.3
91.7
93.0
91.2
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.