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
61.7
57
64
51
62
58
February
69.7
72
77
61
65
68
March
81.8
89
78
72
88
76
April
82.4
74
84
89
89
May
85.6
79
85
84
86
June
83.0
75
86
87
82
July
86.4
87
85
81
89
August
80.0
84
84
85
91
September
84.0
92
92
88
66
October
74.6
82
69
80
69
November
68.0
68
69
63
73
December
64.1
49
69
58
68
Average
77.3
72.9
76.8
76.5
78.6
77.2
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
7.8
7
8
8
8
8
February
7.6
9
8
9
7
9
March
11.6
12
11
12
11
10
April
14.7
13
13
17
16
May
19.5
22
16
18
20
June
22.5
24
22
26
21
July
26.2
27
27
27
25
August
26.8
28
29
26
26
September
22.3
23
25
22
24
October
15.7
17
19
14
16
November
9.7
10
8
10
10
December
6.9
9
4
5
9
Average
15.6
9.4
17.0
16.2
15.9
15.8
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
2.1
2
3
1
2
3
February
0.3
2
0
1
1
1
March
1.4
3
1
3
0
1
April
3.7
4
2
3
3
May
7.5
10
6
6
8
June
9.8
9
10
11
10
July
11.1
11
12
11
11
August
11.8
12
13
12
11
September
10.2
9
10
10
12
October
5.7
7
7
6
7
November
3.1
3
0
5
4
December
1.6
3
0
0
2
Average
5.5
2.1
6.1
5.5
5.6
5.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
32.1
43
31
25
26
40
February
20.3
31
21
19
19
14
March
17.1
23
22
22
19
14
April
17.8
31
21
7
6
May
9.6
6
20
6
14
June
7.9
11
12
8
9
July
2.7
3
3
0
2
August
1.9
4
2
0
3
September
8.0
11
1
9
6
October
14.4
20
9
20
6
November
23.6
18
24
40
24
December
27.3
35
24
30
22
Average
15.7
32.0
16.8
14.8
14.0
12.3
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
5.5
5
4
5
5
7
February
6.3
5
6
6
7
6
March
6.5
6
7
6
6
8
April
7.2
7
7
7
7
May
5.5
5
6
6
6
June
5.5
5
6
6
5
July
4.7
5
4
4
5
August
5.2
5
6
6
5
September
5.9
6
6
6
6
October
6.0
6
5
7
6
November
6.1
5
6
6
7
December
5.0
4
4
7
6
Average
5.7
5.5
5.4
5.6
5.9
6.1
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
194°
176°
211°
203°
205°
February
180°
202°
183°
209°
205°
March
199°
205°
206°
203°
205°
April
207°
216°
201°
207°
May
173°
211°
194°
188°
June
186°
210°
201°
197°
July
201°
187°
185°
175°
August
063°
178°
188°
107°
September
189°
063°
204°
068°
October
122°
139°
196°
205°
November
201°
113°
202°
204°
December
202°
059°
174°
203°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.