Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
January
82.5
85
80
February
86.3
90
83
March
88.7
86
91
April
83.2
83
May
89.9
93
81
June
95.4
94
97
July
93.2
91
96
August
93.3
94
93
September
94.1
95
94
October
92.7
89
96
November
87.9
84
92
December
79.8
90
64
Average
89.2
86.9
89.3
91.4
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
January
10.8
8
14
February
17.2
17
17
March
18.9
19
19
April
21.3
21
May
25.6
26
25
June
30.3
29
32
July
31.7
31
33
August
30.4
31
30
September
28.8
30
28
October
23.0
24
22
November
17.3
18
17
December
13.5
14
13
Average
21.0
14.8
22.7
25.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
1.2
-2
4
February
4.9
4
6
March
7.2
8
7
April
9.7
10
May
14.6
15
14
June
19.4
18
21
July
21.5
21
22
August
21.0
21
21
September
16.8
17
16
October
10.5
12
9
November
5.5
5
6
December
4.0
3
6
Average
9.9
3.3
11.6
14.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
9.3
13
6
February
7.7
8
8
March
6.6
8
6
April
7.7
8
May
4.4
4
6
June
2.5
4
1
July
4.2
5
3
August
4.1
4
4
September
2.0
1
3
October
3.4
4
3
November
4.1
3
5
December
8.5
5
14
Average
6.0
9.1
4.7
4.2
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
January
3.9
4
4
February
4.5
5
4
March
4.4
4
5
April
4.3
4
May
3.7
4
4
June
2.5
2
3
July
2.3
2
3
August
2.5
3
3
September
2.9
3
3
October
3.7
4
4
November
3.5
4
4
December
3.8
4
4
Average
3.6
4.2
3.4
3.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
120°
165°
February
144°
158°
March
138°
143°
April
113°
May
094°
154°
June
083°
086°
July
140°
173°
August
056°
151°
September
080°
055°
October
147°
130°
November
104°
093°
December
135°
116°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.