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
80.8
89
72
67
76
89
February
73.9
75
67
57
70
82
March
83.0
85
79
87
77
81
April
89.7
88
93
89
86
May
93.9
88
88
97
97
June
92.1
90
93
93
89
July
83.2
76
79
87
87
August
82.2
84
75
84
91
September
84.8
79
82
89
87
October
84.1
84
77
82
87
November
77.1
65
65
93
74
December
78.1
77
53
66
90
Average
84.6
82.3
80.1
79.7
85.4
87.2
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
-11.7
-9
-9
-7
-9
-19
February
-7.9
-3
-8
-8
-9
-8
March
-3.5
-3
-2
-1
-4
-4
April
4.5
-1
5
5
6
May
13.0
10
14
15
16
June
18.3
16
21
17
17
July
18.7
17
18
17
18
August
16.5
17
15
16
19
September
11.7
10
12
11
12
October
5.0
4
4
2
6
November
-4.0
-1
-3
-15
-2
December
-8.1
-12
-7
-6
-7
Average
3.5
-6.7
3.3
5.6
3.3
4.3
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
-18.2
-17
-17
-14
-16
-27
February
-15.6
-11
-16
-14
-17
-20
March
-12.2
-13
-12
-9
-15
-14
April
-5.2
-13
-3
-6
-2
May
3.4
3
2
4
5
June
8.4
8
8
9
8
July
11.0
11
10
11
11
August
9.2
11
9
8
9
September
4.8
4
6
3
4
October
-1.1
-3
-2
-3
0
November
-11.1
-7
-11
-26
-9
December
-16.9
-21
-16
-13
-14
Average
-5.5
-14.4
-5.6
-3.6
-6.9
-5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.9
17
29
26
27
16
February
35.5
40
55
55
33
39
March
27.3
28
35
21
47
27
April
20.1
22
14
20
25
May
13.0
31
9
10
8
June
10.3
18
3
13
14
July
20.8
32
24
31
21
August
21.2
22
27
19
8
September
21.7
23
30
22
12
October
20.8
17
21
22
17
November
36.0
52
45
28
39
December
32.0
45
36
45
25
Average
21.9
29.2
30.4
22.5
24.5
19.0
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
4.5
6
3
4
4
5
February
6.3
8
7
6
5
6
March
6.9
8
9
7
8
7
April
6.5
6
8
7
7
May
6.3
8
6
6
6
June
5.4
7
5
7
5
July
5.2
7
5
6
4
August
5.3
6
6
6
4
September
5.8
6
7
5
6
October
6.3
5
6
6
6
November
5.4
6
6
3
7
December
5.7
5
6
8
5
Average
5.9
7.2
6.3
5.9
6.1
5.5
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
127°
105°
355°
146°
019°
February
156°
199°
136°
140°
055°
March
147°
170°
087°
189°
046°
April
049°
138°
173°
125°
May
157°
244°
150°
114°
June
161°
194°
163°
174°
July
170°
204°
194°
225°
August
184°
218°
204°
118°
September
214°
162°
186°
063°
October
149°
165°
144°
122°
November
165°
130°
292°
162°
December
182°
143°
197°
120°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.