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
77.2
65
60
81
94
75
February
86.6
86
79
77
87
92
March
93.5
94
94
95
92
94
April
94.8
91
95
98
96
May
94.4
84
93
98
94
June
91.1
85
94
95
91
July
89.8
70
87
95
96
August
90.8
67
99
96
94
September
87.2
55
96
89
92
October
88.4
90
86
88
91
November
76.7
69
86
68
84
December
82.1
87
81
91
81
Average
88.2
82.4
77.4
90.2
91.7
90.9
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
-13.1
-17
-9
-15
-10
-16
February
-11.1
-5
-11
-13
-16
-8
March
-3.7
-2
-4
-2
-2
-5
April
7.3
10
4
7
7
May
18.7
24
15
17
17
June
22.0
24
23
24
21
July
24.2
26
25
24
23
August
23.0
24
26
23
21
September
17.1
19
21
17
16
October
7.5
10
11
8
4
November
-7.7
-2
-6
-4
-8
December
-13.9
-6
-17
-20
-11
Average
4.6
-9.8
8.8
6.7
5.6
5.1
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
-22.8
-25
-16
-23
-19
-23
February
-23.3
-18
-22
-24
-28
-20
March
-16.4
-15
-18
-14
-16
-18
April
-6.7
-2
-7
-7
-6
May
3.9
6
3
5
2
June
9.1
9
10
10
9
July
11.0
11
11
12
12
August
9.3
10
11
9
10
September
3.3
5
4
5
5
October
-3.6
-2
-1
-1
-4
November
-15.7
-10
-16
-11
-18
December
-22.6
-17
-27
-28
-19
Average
-8.9
-20.7
-4.3
-6.7
-6.2
-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
37.0
45
37
48
19
29
February
35.1
20
51
49
39
23
March
20.7
18
30
20
21
28
April
9.8
10
13
5
10
May
7.3
4
21
3
11
June
10.5
4
11
8
14
July
7.4
9
7
4
16
August
7.2
11
4
5
14
September
5.9
6
4
8
9
October
11.6
8
11
4
16
November
35.1
19
18
37
33
December
30.5
11
50
45
26
Average
17.4
27.2
14.9
18.0
13.8
17.7
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
4.8
5
4
6
4
5
February
5.2
5
5
6
5
6
March
6.2
7
6
7
6
8
April
7.0
7
8
7
7
May
6.4
6
7
7
7
June
5.4
6
5
6
6
July
5.1
5
5
6
6
August
5.0
4
5
5
6
September
5.4
5
6
6
5
October
5.5
6
6
6
5
November
4.7
4
5
5
4
December
3.8
4
6
4
4
Average
5.5
5.5
5.1
6.0
5.8
5.9
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
015°
054°
015°
005°
349°
February
021°
004°
032°
001°
325°
March
117°
096°
059°
082°
004°
April
129°
018°
003°
349°
May
129°
025°
073°
035°
June
329°
081°
326°
100°
July
109°
194°
330°
340°
August
182°
193°
242°
219°
September
199°
218°
237°
315°
October
185°
285°
166°
319°
November
149°
352°
103°
004°
December
181°
351°
331°
066°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.