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
64.8
60
63
65
83
56
February
64.9
60
64
36
89
65
March
98.5
100
96
98
97
99
April
96.4
99
84
100
100
May
95.7
95
92
96
96
June
93.1
92
96
94
94
July
88.3
89
82
89
82
August
78.7
83
64
78
74
September
81.4
84
72
94
67
October
91.6
95
88
100
85
November
94.5
93
96
97
97
December
84.4
80
91
82
90
Average
86.5
74.8
87.0
84.5
91.4
83.2
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.