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
82.9
79
81
86
90
81
February
85.7
79
75
89
86
86
March
91.0
90
85
83
93
92
April
90.5
84
80
93
89
May
91.4
86
79
90
93
June
92.2
75
96
96
93
July
93.1
81
100
91
94
August
91.8
73
95
97
94
September
86.9
74
91
79
86
October
86.1
81
86
90
86
November
84.1
76
82
79
85
December
82.2
94
72
91
82
Average
88.8
82.5
79.9
86.9
90.1
89.3
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
-15.7
-17
-11
-18
-11
-15
February
-14.5
-7
-14
-17
-18
-11
March
-4.2
-5
-7
-4
-3
-5
April
5.0
8
2
4
2
May
15.8
23
12
13
13
June
21.6
22
22
23
21
July
24.1
25
24
25
23
August
22.3
23
25
22
20
September
15.9
20
20
16
14
October
6.1
8
10
8
2
November
-6.2
-3
-5
-3
-7
December
-13.4
-3
-17
-20
-11
Average
3.4
-10.4
7.7
5.3
4.8
3.8
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
-23.5
-25
-17
-27
-19
-22
February
-26.9
-18
-26
-29
-29
-22
March
-18.5
-17
-20
-18
-17
-20
April
-8.8
-3
-9
-9
-9
May
2.9
9
2
1
1
June
9.7
11
10
11
10
July
12.3
12
13
13
13
August
11.0
11
12
11
13
September
5.1
9
7
7
5
October
-2.2
-1
0
0
-4
November
-13.3
-10
-13
-10
-15
December
-22.6
-13
-26
-28
-19
Average
-8.7
-21.8
-4.8
-6.3
-6.4
-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
35.6
40
36
51
34
26
February
28.7
28
47
31
27
24
March
16.0
15
32
21
14
20
April
15.9
31
25
12
25
May
8.1
1
26
5
11
June
7.7
13
5
6
11
July
6.0
10
4
6
8
August
7.1
8
4
4
17
September
8.3
5
10
18
11
October
16.6
25
20
7
32
November
40.1
42
48
30
44
December
33.2
13
58
43
27
Average
17.1
27.5
20.7
22.6
14.4
19.3
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
5.8
5
5
6
6
6
February
6.7
7
7
7
7
7
March
7.6
8
7
8
8
8
April
8.0
9
9
8
8
May
8.2
7
8
8
9
June
7.7
8
7
8
8
July
6.9
7
7
7
7
August
7.0
6
7
7
9
September
7.0
7
7
7
7
October
7.3
8
7
7
8
November
6.3
6
7
6
7
December
5.7
6
7
6
5
Average
7.1
6.7
6.9
7.3
7.1
7.6
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
316°
325°
360°
057°
298°
February
036°
024°
329°
310°
290°
March
074°
071°
025°
026°
012°
April
101°
048°
313°
007°
May
141°
064°
089°
059°
June
006°
082°
290°
094°
July
077°
267°
259°
349°
August
265°
272°
270°
264°
September
248°
281°
273°
304°
October
268°
290°
218°
280°
November
285°
315°
096°
289°
December
252°
351°
308°
294°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.