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
38.6
65
86
24
33
22
February
47.2
79
40
41
52
53
March
73.1
90
80
60
73
74
April
96.5
99
84
100
99
May
99.5
100
100
100
100
June
100.0
100
100
100
100
July
99.9
100
100
100
100
August
100.0
100
100
100
100
September
100.0
100
100
100
100
October
99.2
99
100
97
100
November
90.7
92
90
81
96
December
54.4
77
65
27
52
Average
83.1
78.2
90.2
81.8
83.3
82.6
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.