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
2021
2020
January
78.1
66
76
74
89
88
February
91.7
91
80
88
92
100
March
92.9
89
91
93
97
99
April
91.5
86
95
97
93
May
86.8
70
82
90
90
June
88.7
93
75
92
94
July
90.7
82
91
89
95
August
89.4
78
86
97
90
September
90.5
86
87
92
91
October
87.7
73
86
93
88
November
88.6
79
84
91
98
December
85.7
75
91
94
86
Average
88.7
81.8
81.0
85.7
92.8
92.6
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
2021
2020
January
6.3
6
8
5
7
4
February
5.9
7
6
8
5
7
March
7.2
9
6
8
7
7
April
9.2
8
9
10
9
May
12.5
13
11
11
13
June
14.9
16
14
16
15
July
17.4
18
18
17
17
August
18.7
19
20
19
17
September
16.1
16
17
16
17
October
12.5
13
14
11
12
November
8.8
10
7
8
8
December
6.1
8
3
3
8
Average
10.8
7.4
11.7
11.3
10.7
11.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
2.8
3
4
2
3
1
February
1.9
3
2
4
1
3
March
2.2
3
2
4
3
3
April
3.9
3
4
4
5
May
7.6
8
6
7
8
June
10.4
11
10
12
10
July
12.8
13
13
13
13
August
13.8
14
15
14
13
September
11.8
12
12
11
12
October
7.9
9
9
6
8
November
4.8
6
3
4
4
December
2.6
4
-1
-1
5
Average
6.4
2.9
7.2
6.8
6.4
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
30.4
43
37
28
32
32
February
24.0
24
46
21
31
19
March
23.5
29
33
31
28
20
April
20.2
28
28
14
13
May
14.5
13
22
19
15
June
12.9
8
19
10
14
July
9.9
12
12
7
14
August
8.2
9
10
7
16
September
15.2
19
18
26
19
October
21.3
22
35
26
18
November
26.9
33
31
34
26
December
25.3
48
16
20
27
Average
19.2
32.5
24.4
22.6
19.8
18.2
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
2021
2020
January
11.9
13
13
10
14
11
February
11.6
13
12
12
11
12
March
10.9
11
13
13
11
11
April
11.2
13
12
9
10
May
10.2
11
10
10
12
June
9.8
10
9
10
12
July
7.9
8
7
8
9
August
9.3
9
9
9
11
September
10.2
14
9
11
8
October
10.9
13
11
11
10
November
11.8
11
14
11
12
December
12.1
15
11
11
15
Average
10.6
12.1
11.6
10.5
10.2
10.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
130°
144°
158°
158°
183°
February
193°
229°
187°
208°
226°
March
157°
129°
163°
216°
303°
April
147°
121°
223°
154°
May
148°
151°
167°
142°
June
150°
125°
146°
162°
July
124°
159°
146°
189°
August
140°
179°
256°
192°
September
159°
152°
171°
162°
October
142°
207°
164°
221°
November
164°
132°
178°
211°
December
158°
288°
316°
158°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.