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
78.2
72
64
84
82
February
83.6
81
85
72
76
93
March
86.4
91
77
96
55
97
April
77.4
91
87
82
0
98
May
93.3
97
95
74
98
June
88.8
95
100
52
99
July
95.9
98
98
89
100
August
80.3
94
95
19
September
78.1
90
99
8
October
91.7
89
99
88
November
89.1
92
87
88
December
76.5
62
60
83
Average
86.0
84.6
86.9
91.0
55.8
95.3
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
-7.0
-5
-7
-9
-6
February
-5.5
4
-5
-8
-9
-4
March
2.4
6
-3
2
5
4
April
8.2
14
6
6
0
10
May
19.5
25
20
18
18
June
25.7
28
28
18
28
July
28.1
28
29
29
29
August
22.2
28
28
7
September
19.1
25
24
3
October
13.0
14
17
17
November
3.0
6
2
6
December
-3.3
3
-5
-4
Average
8.4
4.7
12.4
11.7
8.8
9.3
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
-16.6
-12
-15
-22
-15
February
-15.1
-6
-17
-20
-19
-15
March
-7.9
-6
-14
-7
-2
-4
April
0.0
3
-3
-1
0
-1
May
7.6
11
9
7
7
June
13.6
17
16
7
15
July
16.1
14
17
17
19
August
12.4
16
15
3
September
9.2
12
10
2
October
2.9
4
2
6
November
-6.8
-4
-6
-4
December
-11.1
-4
-13
-13
Average
-2.7
-6.5
1.4
0.6
1.0
-1.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.4
22
29
17
0
February
8.7
9
15
29
10
0
March
5.7
12
24
3
3
0
April
6.7
17
16
15
0
0
May
1.3
3
3
2
0
June
0.5
2
1
0
0
July
1.4
2
2
2
0
August
0.9
3
1
1
September
1.5
6
1
0
October
4.6
11
2
11
November
8.3
14
24
4
December
11.0
23
32
17
Average
4.8
14.9
11.5
8.5
3.9
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
9.9
10
9
11
10
February
10.2
10
11
13
7
9
March
10.1
12
12
11
5
11
April
9.7
13
11
15
0
9
May
10.2
11
11
9
11
June
8.5
8
11
5
11
July
7.5
8
9
7
7
August
7.0
9
9
1
September
7.5
9
10
1
October
10.3
10
11
10
November
10.3
10
12
10
December
9.9
10
12
9
Average
9.5
11.4
9.7
10.9
5.6
10.0
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
301°
319°
323°
198°
February
284°
009°
318°
225°
311°
March
337°
360°
340°
131°
323°
April
358°
347°
009°
360°
311°
May
138°
218°
185°
036°
June
122°
232°
225°
156°
July
315°
243°
153°
154°
August
325°
177°
230°
September
133°
184°
155°
October
319°
266°
148°
November
282°
295°
261°
December
303°
342°
276°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.