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
74.5
67
77
80
73
81
February
81.0
68
80
83
88
93
March
86.4
80
92
78
90
82
April
80.3
66
65
83
88
May
88.0
84
83
84
90
June
90.0
86
86
94
89
July
92.5
89
92
91
93
August
89.2
80
83
87
87
September
85.6
80
89
84
84
October
80.9
61
83
80
92
November
76.9
86
72
84
64
December
77.0
71
67
76
80
Average
83.8
71.9
79.0
80.7
85.2
86.0
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
-13.8
-11
-11
-16
-9
-11
February
-11.7
-6
-11
-13
-11
-8
March
-3.2
-3
-4
-3
0
-2
April
3.9
1
4
8
3
May
14.8
17
15
15
14
June
21.8
24
22
22
21
July
25.0
22
24
25
28
August
22.5
23
23
24
23
September
16.8
20
18
17
15
October
8.0
9
11
13
4
November
-3.1
-2
-1
0
-2
December
-10.0
-3
-11
-12
-10
Average
4.7
-7.3
7.1
6.4
7.8
6.9
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
-21.3
-19
-19
-28
-15
-19
February
-22.4
-17
-23
-26
-23
-20
March
-15.0
-14
-17
-16
-13
-15
April
-7.2
-7
-6
-4
-8
May
2.4
4
4
3
1
June
8.9
10
9
9
9
July
12.6
11
12
12
15
August
10.9
10
12
12
11
September
6.5
8
7
8
6
October
0.8
1
2
6
-3
November
-10.7
-9
-7
-6
-8
December
-18.2
-11
-18
-21
-18
Average
-6.4
-17.3
-4.5
-5.6
-3.4
-4.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
34.8
41
47
36
29
27
February
27.7
44
39
21
20
24
March
23.8
38
25
29
21
27
April
24.4
47
41
12
17
May
15.1
15
17
23
20
June
9.0
4
19
3
13
July
7.1
9
19
0
5
August
8.5
17
12
4
9
September
12.8
6
14
16
19
October
17.8
28
11
13
20
November
37.3
27
44
42
41
December
35.6
32
43
32
44
Average
21.0
40.7
24.2
24.9
16.1
19.6
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
7.2
8
7
9
6
6
February
7.8
8
9
8
7
8
March
8.4
9
9
8
9
8
April
8.6
10
9
8
8
May
7.9
8
8
8
8
June
6.8
6
7
7
7
July
5.5
6
7
6
6
August
5.9
6
7
7
7
September
6.6
6
7
7
9
October
7.2
7
8
7
7
November
7.9
8
8
8
8
December
6.8
7
6
7
7
Average
7.3
8.1
7.3
7.7
7.2
7.4
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
288°
308°
273°
285°
293°
February
315°
290°
280°
252°
281°
March
334°
339°
323°
306°
349°
April
012°
027°
006°
324°
May
339°
010°
307°
331°
June
036°
286°
313°
347°
July
288°
308°
283°
275°
August
310°
281°
222°
280°
September
260°
292°
264°
274°
October
337°
300°
274°
252°
November
277°
315°
289°
286°
December
262°
307°
282°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.