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
67.4
81
92
0
95
0
February
85.0
94
94
85
82
54
March
90.1
85
96
82
91
90
April
89.4
78
93
94
92
May
88.4
96
85
95
91
June
94.3
92
99
97
98
July
91.7
97
100
95
98
August
96.5
96
99
96
98
September
93.9
84
97
97
98
October
83.3
89
88
93
84
November
80.3
98
95
100
92
December
73.3
85
83
93
Average
87.5
86.6
91.5
91.3
93.9
84.6
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
5.2
6
1
2
6
8
February
8.2
8
9
8
5
8
March
11.1
13
11
12
13
13
April
16.3
17
16
17
15
May
21.7
22
23
23
21
June
26.9
25
27
28
28
July
28.7
30
31
30
32
August
26.5
28
8
30
30
September
22.3
25
0
27
26
October
17.7
21
0
22
19
November
11.5
14
0
17
17
December
7.1
10
0
8
Average
16.1
8.9
18.0
11.1
19.8
18.7
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
0.2
1
0
2
0
2
February
1.1
2
2
0
-1
2
March
3.5
5
4
4
4
6
April
8.3
9
9
8
7
May
13.1
12
14
13
12
June
18.2
16
20
19
19
July
20.7
20
23
22
24
August
19.7
21
5
23
23
September
16.2
19
0
19
19
October
11.9
13
0
15
13
November
5.7
6
0
10
9
December
2.3
5
0
2
Average
9.3
2.7
10.6
6.6
12.3
11.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.4
26
13
0
3
0
February
10.5
11
5
18
20
4
March
10.9
20
6
12
7
11
April
10.5
13
10
10
14
May
10.4
6
12
11
6
June
3.2
2
3
2
2
July
3.0
4
1
3
4
August
4.7
6
2
5
5
September
7.7
23
5
4
2
October
7.6
11
9
4
13
November
4.8
3
5
3
9
December
9.1
13
15
13
Average
8.6
18.8
8.6
8.2
6.5
6.6
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
6.7
7
6
0
6
7
February
6.4
6
6
7
7
7
March
6.7
7
6
7
6
7
April
6.4
7
7
5
7
May
6.3
6
6
6
6
June
4.8
6
6
5
6
July
4.6
5
6
5
5
August
5.0
6
6
6
6
September
5.9
7
6
6
6
October
6.7
6
7
7
6
November
6.2
6
6
6
6
December
6.9
7
7
7
Average
6.0
6.4
5.9
6.4
5.7
6.4
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
291°
278°
360°
292°
272°
February
255°
247°
262°
355°
263°
March
005°
248°
278°
256°
006°
April
052°
084°
246°
232°
May
216°
050°
228°
265°
June
069°
208°
225°
223°
July
216°
219°
231°
225°
August
210°
203°
201°
229°
September
034°
254°
226°
149°
October
260°
010°
327°
290°
November
257°
254°
245°
246°
December
292°
347°
251°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.