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
82.6
83
81
74
87
82
February
86.7
95
87
82
89
84
March
88.5
83
88
91
96
98
April
85.3
51
94
92
97
May
92.0
0
99
99
99
June
87.9
0
97
100
97
July
97.3
0
99
95
96
August
96.4
94
92
98
99
September
94.2
92
87
98
95
October
88.3
91
98
23
97
November
91.1
96
92
91
97
December
86.4
74
87
89
91
Average
89.3
86.9
74.5
92.0
91.8
95.0
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
-2.3
-1
1
-5
-2
1
February
0.8
4
1
0
-2
1
March
4.8
7
4
6
8
8
April
11.5
10
13
15
12
May
19.0
0
23
21
20
June
23.1
0
25
28
27
July
27.4
0
28
25
30
August
26.5
25
27
28
26
September
22.3
24
21
23
22
October
14.9
17
17
5
14
November
6.9
6
10
7
11
December
1.6
4
3
4
3
Average
11.5
3.4
8.8
14.6
13.7
14.1
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
-10.4
-7
-5
-18
-9
-6
February
-9.3
-6
-9
-10
-11
-8
March
-4.0
-1
-3
-3
-4
-1
April
2.0
2
2
3
2
May
8.3
0
10
9
9
June
12.8
0
13
16
15
July
16.8
0
17
16
19
August
16.2
15
16
19
16
September
11.8
12
12
13
10
October
6.2
9
5
3
5
November
-1.2
-1
2
-1
3
December
-6.1
-2
-3
-6
-4
Average
2.4
-5.6
1.5
3.8
4.2
4.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.4
21
20
16
13
16
February
15.3
8
17
20
17
20
March
13.3
19
18
12
7
9
April
13.0
3
15
16
9
May
9.1
0
10
5
4
June
8.0
0
11
8
5
July
5.9
0
4
9
4
August
6.0
11
6
7
7
September
7.3
5
10
6
6
October
11.3
17
3
11
13
November
13.1
8
13
12
8
December
17.3
24
20
10
14
Average
11.5
15.8
11.8
10.7
9.4
8.9
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
4.0
4
3
5
3
3
February
5.1
5
5
6
4
5
March
5.4
5
5
5
6
6
April
5.0
3
5
5
6
May
4.3
0
4
4
5
June
3.9
0
4
5
4
July
3.4
0
4
3
3
August
3.4
4
3
4
3
September
3.5
2
3
4
5
October
4.2
4
4
0
5
November
5.0
5
5
4
6
December
4.3
3
4
5
5
Average
4.3
4.9
3.4
4.4
4.1
4.7
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
253°
307°
251°
289°
211°
February
217°
212°
199°
241°
240°
March
275°
278°
226°
234°
242°
April
252°
286°
321°
293°
May
360°
215°
282°
279°
June
360°
213°
211°
221°
July
360°
218°
251°
238°
August
225°
206°
205°
228°
September
262°
247°
206°
203°
October
199°
191°
151°
202°
November
216°
210°
217°
203°
December
208°
230°
220°
218°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.