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
68.6
66
69
50
68
February
73.3
100
74
66
62
63
March
79.0
67
77
65
89
81
April
85.4
96
68
84
83
May
84.3
92
91
80
91
June
87.2
88
80
96
75
July
88.7
82
84
85
83
August
85.4
84
75
85
September
84.4
100
81
66
81
October
81.4
95
84
75
78
November
62.6
100
59
57
51
December
64.4
56
75
49
Average
78.6
73.9
80.8
73.5
75.2
75.3
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
-14.9
-11
-19
-9
-12
February
-13.2
6
-12
-15
-14
-12
March
-6.0
-11
-9
-6
0
-4
April
2.0
2
2
7
-1
May
10.7
12
14
12
10
June
18.5
22
21
20
16
July
21.7
23
19
20
24
August
19.7
20
22
19
September
15.4
14
17
16
14
October
8.5
8
12
12
4
November
-3.6
4
-2
-1
-1
December
-11.8
-10
-13
-6
Average
3.2
-8.1
1.9
4.0
6.2
4.2
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
-19.9
-17
-26
-12
-16
February
-20.8
3
-19
-22
-19
-18
March
-13.6
-15
-14
-12
-8
-11
April
-4.4
-4
-2
0
-6
May
5.0
7
9
6
5
June
12.3
15
15
12
10
July
15.7
16
14
15
19
August
14.1
15
17
13
September
9.5
9
10
11
9
October
3.6
5
6
6
0
November
-6.6
1
-4
-3
-3
December
-15.2
-16
-17
-10
Average
-2.0
-12.3
-5.9
-2.3
0.8
-1.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
45.0
36
48
57
45
February
41.0
50
33
40
36
56
March
29.4
39
35
41
13
32
April
18.1
3
37
11
36
May
17.7
13
18
11
21
June
12.9
1
24
6
24
July
10.4
3
17
12
14
August
12.0
15
15
17
September
18.7
0
13
32
28
October
25.2
15
19
20
35
November
48.9
0
49
45
50
December
48.4
44
39
49
Average
27.7
41.3
20.5
31.0
23.6
32.7
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
8.2
7
10
7
8
February
8.7
8
7
9
6
9
March
9.0
10
9
9
9
9
April
8.8
10
9
8
10
May
9.1
9
8
10
9
June
8.7
9
9
8
8
July
8.4
7
7
9
8
August
8.5
8
10
8
September
9.3
10
10
9
11
October
8.8
7
9
7
9
November
9.4
9
10
10
10
December
8.4
8
9
7
Average
8.8
9.6
8.2
8.9
8.5
8.7
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
237°
241°
234°
233°
February
150°
222°
238°
262°
279°
March
295°
289°
282°
245°
185°
April
270°
307°
326°
303°
May
302°
271°
283°
287°
June
307°
202°
271°
292°
July
288°
277°
288°
281°
August
259°
262°
293°
September
015°
267°
246°
245°
October
283°
195°
225°
241°
November
179°
259°
250°
231°
December
231°
218°
225°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.