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
65.5
53
61
82
76
68
February
81.6
87
83
71
84
86
March
84.9
85
77
78
96
86
April
89.0
91
89
93
83
May
92.9
98
89
96
94
June
91.2
81
96
97
97
July
94.2
89
94
91
94
August
92.6
89
93
98
86
September
92.0
90
88
97
89
October
87.2
87
93
81
94
November
87.4
89
83
91
89
December
78.1
57
77
83
93
Average
86.0
75.4
83.3
86.8
91.1
88.6
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
0.7
0
4
-2
1
3
February
3.9
9
6
2
-1
3
March
9.0
13
8
10
13
10
April
14.6
17
13
16
14
May
21.5
23
23
21
20
June
27.0
27
29
28
29
July
28.4
28
29
28
30
August
27.5
27
28
29
29
September
24.7
24
24
27
24
October
17.2
18
18
19
16
November
8.8
11
11
9
13
December
4.7
7
4
7
4
Average
14.6
7.1
16.6
16.1
16.4
16.1
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
-6.6
-5
-1
-10
-4
-3
February
-5.1
-2
-3
-7
-9
-5
March
-1.3
2
-1
0
1
1
April
3.7
5
4
5
3
May
10.6
10
13
10
10
June
15.6
15
15
18
15
July
18.0
17
19
19
18
August
16.5
17
18
19
14
September
14.3
15
14
15
13
October
7.6
8
6
11
6
November
0.6
1
2
1
4
December
-3.7
2
-2
-1
-3
Average
5.2
-2.3
7.0
6.2
7.0
6.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
21.6
26
22
15
14
20
February
14.1
7
16
25
15
15
March
12.1
8
19
21
6
9
April
12.3
17
16
12
11
May
7.4
8
9
5
7
June
5.4
7
3
7
2
July
4.5
5
8
4
3
August
2.6
5
2
1
2
September
5.3
6
8
6
5
October
12.2
18
14
10
8
November
12.0
10
18
10
11
December
13.0
21
13
5
7
Average
10.1
13.2
12.2
12.0
7.5
7.8
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
9.3
9
8
10
8
9
February
10.0
9
11
11
9
10
March
10.6
11
10
11
11
10
April
10.3
10
12
10
10
May
8.7
8
9
9
9
June
7.8
8
8
8
7
July
6.9
6
7
7
7
August
6.9
8
7
6
6
September
7.4
7
7
9
8
October
8.9
9
9
8
9
November
9.6
9
11
10
11
December
9.1
8
9
10
9
Average
8.8
9.8
8.3
9.3
8.6
8.5
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
232°
239°
252°
217°
226°
February
256°
247°
248°
266°
283°
March
242°
284°
266°
243°
245°
April
240°
225°
267°
297°
May
046°
170°
257°
332°
June
348°
269°
244°
211°
July
266°
254°
292°
279°
August
279°
260°
207°
298°
September
157°
259°
246°
234°
October
249°
240°
218°
235°
November
238°
224°
238°
232°
December
227°
186°
216°
238°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.