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
82.6
71
83
97
76
83
February
88.9
83
93
96
84
94
March
81.7
94
84
12
86
66
April
93.9
94
100
98
93
93
May
88.1
88
91
90
88
June
97.6
96
100
97
98
July
93.7
92
89
93
94
August
93.4
94
94
93
95
September
93.7
94
96
95
95
October
90.9
93
100
95
94
November
91.9
89
96
95
94
December
88.4
82
85
97
84
Average
90.3
86.4
90.9
94.2
91.3
90.1
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
2.6
0
1
6
5
3
February
4.9
12
3
7
-2
7
March
11.6
13
9
7
14
13
April
18.0
19
19
19
18
19
May
22.4
24
23
22
21
June
29.7
28
30
30
32
July
29.9
29
31
29
31
August
29.0
30
31
30
31
September
27.1
28
28
28
26
October
18.0
19
21
20
17
November
11.9
13
10
14
15
December
5.7
7
4
9
7
Average
16.8
10.7
17.5
19.6
18.3
18.4
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
-7.2
-9
-7
-8
-4
-5
February
-8.8
-2
-7
-8
-12
-5
March
-1.0
-1
-4
3
1
1
April
3.2
5
3
4
4
2
May
9.9
10
10
11
9
June
16.4
15
16
16
18
July
18.4
17
19
19
19
August
16.9
17
17
18
17
September
13.1
13
12
14
11
October
4.7
6
5
7
4
November
-2.9
0
-3
1
0
December
-5.0
-3
-7
-4
-5
Average
4.4
-2.1
5.0
5.5
6.0
5.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.2
5
7
4
6
6
February
6.7
6
8
1
10
4
March
6.4
7
5
4
12
6
April
4.2
2
1
1
7
4
May
5.6
2
9
4
10
June
1.8
4
1
0
1
July
1.0
1
2
1
2
August
1.6
1
1
0
1
September
2.7
1
3
2
4
October
2.9
1
2
1
1
November
3.3
3
2
3
2
December
4.5
5
4
1
5
Average
3.9
4.9
3.1
2.6
3.8
3.7
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
8.3
9
8
10
9
8
February
9.4
11
10
10
7
10
March
10.9
12
11
3
11
11
April
12.7
14
15
16
11
12
May
10.2
10
11
10
10
June
9.4
7
11
8
12
July
7.0
6
7
7
8
August
6.8
7
7
7
8
September
8.8
8
8
8
9
October
9.8
11
10
9
9
November
9.9
10
11
9
10
December
9.1
9
12
9
9
Average
9.6
11.4
9.2
9.9
8.7
9.5
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
335°
342°
293°
328°
293°
February
302°
309°
330°
019°
323°
March
019°
001°
061°
053°
175°
April
330°
301°
252°
321°
334°
May
129°
167°
144°
054°
June
121°
166°
157°
166°
July
104°
129°
137°
132°
August
184°
125°
143°
159°
September
164°
150°
151°
144°
October
330°
256°
326°
342°
November
266°
297°
285°
240°
December
311°
292°
311°
319°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.