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
71.7
63
36
90
67
February
86.3
92
84
87
80
96
March
87.7
95
84
89
88
69
April
85.1
90
90
73
94
63
May
82.9
97
14
94
83
June
86.1
96
42
94
98
July
95.2
97
95
90
99
August
92.6
93
92
96
100
September
90.9
94
96
77
98
October
88.5
87
99
84
91
November
87.5
98
79
100
87
December
77.1
74
69
84
83
Average
86.7
85.6
89.5
77.5
86.9
87.1
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
-5.7
-3
-4
-6
-2
February
-2.1
5
-2
-4
-8
-3
March
5.1
9
2
5
9
10
April
11.8
15
12
3
14
13
May
20.7
23
23
21
18
June
26.1
28
27
29
24
July
26.8
27
27
27
28
August
25.1
27
25
27
24
September
23.1
25
23
24
22
October
13.7
15
16
17
10
November
5.5
9
6
12
8
December
0.1
5
-2
2
1
Average
12.4
6.2
14.6
12.8
14.5
13.5
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
-12.4
-10
-10
-16
-9
February
-12.8
-5
-11
-15
-16
-13
March
-3.0
-3
-5
-3
-1
1
April
1.3
3
2
-3
2
0
May
9.1
10
12
8
7
June
14.8
15
15
17
13
July
16.0
14
17
16
18
August
14.8
15
15
15
18
September
11.7
12
11
11
11
October
4.0
5
3
7
1
November
-3.2
-3
-4
0
-1
December
-8.7
-3
-9
-6
-8
Average
2.6
-4.2
4.0
2.5
3.9
3.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.2
9
22
8
10
February
8.8
3
13
11
10
6
March
8.6
6
14
6
10
15
April
8.7
10
10
1
5
5
May
7.1
7
1
8
9
June
3.4
3
2
5
2
July
2.5
1
2
5
0
August
4.2
4
3
2
0
September
3.7
3
4
1
1
October
7.9
9
2
6
12
November
7.9
3
14
0
5
December
12.1
5
20
19
6
Average
6.9
7.1
6.7
5.4
6.4
5.5
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
9.3
9
5
11
8
February
9.8
10
10
11
9
9
March
10.3
11
9
11
11
9
April
11.4
14
12
14
11
11
May
9.4
7
11
10
10
June
8.8
6
11
8
11
July
6.2
5
8
5
6
August
6.0
6
6
6
8
September
7.5
6
8
7
9
October
8.9
9
9
7
10
November
10.8
10
12
10
11
December
9.4
9
11
11
9
Average
9.2
11.1
7.9
9.7
8.3
9.5
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
271°
286°
257°
309°
February
244°
246°
282°
276°
279°
March
313°
303°
328°
160°
025°
April
293°
266°
284°
283°
304°
May
138°
205°
184°
011°
June
160°
221°
222°
153°
July
253°
227°
183°
177°
August
210°
197°
181°
176°
September
161°
195°
197°
216°
October
287°
238°
177°
267°
November
233°
243°
207°
226°
December
221°
156°
214°
256°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.