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
77.1
63
70
91
78
74
February
86.3
97
86
86
83
91
March
90.5
93
89
91
95
83
April
91.6
92
93
96
94
May
92.7
96
88
98
89
June
94.0
86
97
99
100
July
96.7
92
95
97
99
August
98.4
99
98
99
99
September
95.5
96
95
100
91
October
90.5
94
91
90
94
November
92.8
94
92
99
94
December
86.6
76
74
92
95
Average
90.8
84.4
89.6
91.6
94.4
92.2
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
0.4
-1
3
-2
1
2
February
4.0
10
6
2
-2
3
March
9.2
12
8
10
12
11
April
15.0
17
13
17
15
May
21.8
23
23
21
21
June
27.6
27
29
29
29
July
29.0
29
29
28
31
August
28.4
28
28
30
30
September
25.1
25
24
26
24
October
17.3
18
17
19
16
November
8.9
11
11
9
14
December
4.8
7
4
7
5
Average
14.8
6.9
16.9
16.1
16.5
16.6
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
-6.3
-5
-2
-10
-4
-4
February
-5.2
0
-3
-7
-10
-4
March
0.7
3
0
1
3
2
April
5.0
6
5
7
4
May
11.5
12
14
11
11
June
17.2
16
18
19
18
July
20.2
20
20
20
22
August
19.3
19
19
21
20
September
16.2
17
16
17
15
October
8.8
11
7
12
6
November
1.3
2
3
1
5
December
-2.2
2
-2
0
-2
Average
6.3
-2.9
8.3
7.2
8.1
7.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
22.3
24
33
17
18
20
February
15.4
1
14
26
21
15
March
13.1
9
19
27
6
16
April
12.8
12
17
8
13
May
9.1
7
14
7
11
June
5.2
5
6
6
4
July
3.7
7
7
3
3
August
2.8
4
5
1
0
September
5.9
12
6
3
7
October
11.1
14
7
12
8
November
11.6
9
18
10
7
December
13.2
21
27
8
10
Average
10.2
11.1
12.4
13.8
7.8
9.0
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
9.2
9
8
10
9
8
February
10.1
10
11
11
9
11
March
10.7
11
11
10
12
10
April
10.4
11
11
10
10
May
9.4
9
10
10
9
June
8.6
9
9
8
9
July
7.9
7
8
8
8
August
8.0
9
8
8
8
September
8.3
7
8
9
9
October
9.3
9
9
9
10
November
9.6
9
11
9
11
December
9.0
8
9
10
9
Average
9.3
10.0
8.8
9.6
9.0
9.2
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
268°
261°
278°
292°
248°
February
260°
254°
275°
287°
301°
March
270°
303°
269°
217°
240°
April
234°
213°
250°
296°
May
048°
137°
144°
045°
June
027°
250°
220°
183°
July
296°
276°
344°
261°
August
347°
297°
180°
265°
September
117°
319°
247°
261°
October
266°
232°
010°
275°
November
245°
229°
244°
231°
December
246°
192°
235°
261°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.