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
84.1
70
76
91
96
92
February
83.0
79
79
84
88
89
March
79.5
79
73
74
97
82
April
88.1
82
88
96
95
May
93.4
83
97
96
97
June
95.6
90
98
98
95
July
92.7
91
93
85
98
August
89.3
90
96
94
97
September
91.7
94
95
97
97
October
91.6
83
95
96
91
November
83.7
92
70
97
82
December
87.8
94
86
88
89
Average
87.5
76.1
85.2
89.1
94.0
92.5
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
-5.0
-9
-4
-3
-3
-8
February
-6.3
-2
-3
-2
-10
-1
March
0.6
-1
-3
4
8
-2
April
9.2
11
8
13
7
May
18.8
24
17
17
17
June
21.6
23
20
24
21
July
23.6
23
24
26
22
August
24.3
24
26
24
24
September
18.7
20
23
21
20
October
11.2
11
16
12
7
November
1.2
5
-3
6
1
December
-5.8
2
-10
-11
-1
Average
8.0
-4.0
11.2
10.6
10.6
8.8
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
-16.9
-19
-12
-14
-13
-18
February
-17.3
-13
-14
-13
-21
-12
March
-12.7
-11
-16
-7
-6
-14
April
-4.3
-3
-3
-5
-5
May
4.3
7
3
3
3
June
8.4
9
9
10
9
July
10.1
10
11
11
10
August
8.9
9
11
9
9
September
4.3
5
5
5
5
October
-3.3
-2
0
-3
-3
November
-10.7
-7
-14
-7
-9
December
-15.7
-9
-21
-20
-12
Average
-5.6
-15.7
-2.2
-3.8
-3.0
-4.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
19.1
29
12
15
16
23
February
28.0
23
29
31
23
21
March
21.5
41
31
18
6
26
April
15.1
16
27
6
16
May
8.3
2
10
12
16
June
12.9
19
18
9
10
July
6.6
9
9
1
8
August
5.7
9
3
8
3
September
10.5
7
2
5
6
October
12.1
19
4
4
21
November
19.2
5
34
2
13
December
15.9
4
25
18
8
Average
15.8
31.9
13.8
15.8
8.7
13.7
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
6.4
6
6
8
7
6
February
6.8
7
7
8
7
7
March
6.9
7
5
9
8
7
April
8.1
8
10
8
9
May
8.4
8
8
9
9
June
8.1
8
9
7
7
July
6.2
6
5
5
7
August
6.4
6
6
7
7
September
7.3
8
7
8
8
October
8.0
8
7
8
8
November
6.6
6
8
7
7
December
6.0
6
7
6
6
Average
7.1
6.6
6.8
7.6
7.2
7.3
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
075°
289°
286°
214°
210°
February
307°
172°
306°
263°
238°
March
145°
141°
315°
220°
006°
April
171°
332°
302°
273°
May
146°
308°
224°
277°
June
296°
347°
275°
313°
July
327°
179°
119°
282°
August
271°
282°
279°
213°
September
197°
295°
243°
278°
October
254°
243°
214°
279°
November
230°
313°
206°
269°
December
185°
313°
288°
216°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.