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
70.2
73
84
74
77
53
February
85.0
95
93
95
83
95
March
93.2
97
98
99
95
93
April
96.1
94
95
97
99
May
96.7
96
100
99
98
June
96.5
97
100
99
90
July
98.3
100
100
100
97
August
98.1
99
98
98
98
September
96.2
99
94
97
100
October
93.6
99
89
98
83
November
82.7
96
74
89
60
December
75.3
87
85
65
82
Average
91.4
89.3
95.6
93.4
93.0
89.5
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.