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
71.3
65
73
68
76
91
February
86.6
90
100
98
85
100
March
97.7
100
96
100
100
100
April
98.8
99
97
99
99
May
99.6
99
100
100
100
June
99.5
99
100
99
100
July
99.8
100
100
100
100
August
97.6
92
99
99
100
September
93.8
98
99
98
73
October
98.3
94
100
100
96
November
88.4
92
91
83
88
December
68.2
75
44
95
60
Average
92.1
85.7
94.6
93.8
95.0
92.8
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
3.6
1
4
2
7
8
February
7.1
10
7
10
7
12
March
13.2
15
12
16
15
14
April
17.5
17
14
21
20
May
24.1
27
20
24
23
June
27.8
29
27
32
27
July
32.4
33
34
34
31
August
31.3
31
34
31
31
September
25.3
25
27
26
26
October
18.1
18
22
18
19
November
9.0
9
6
11
10
December
3.7
6
-1
5
5
Average
16.8
8.7
18.5
18.2
19.2
18.8
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
-3.7
-4
1
-3
0
0
February
-3.8
1
5
-3
-3
-2
March
-1.6
1
-1
2
-1
0
April
2.9
3
2
3
3
May
7.6
10
6
7
8
June
8.9
10
11
13
11
July
11.6
13
13
14
8
August
11.0
12
14
13
3
September
8.3
9
9
8
9
October
3.2
4
5
5
4
November
-1.3
0
-3
2
0
December
-2.0
1
-6
-1
-2
Average
3.3
-1.1
5.6
4.2
4.9
3.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.0
13
4
4
7
8
February
9.0
7
2
1
11
0
March
3.6
2
3
4
0
1
April
4.4
6
8
0
1
May
2.9
2
7
1
4
June
1.9
1
3
1
4
July
0.3
1
0
1
0
August
1.0
5
1
0
0
September
2.1
3
1
6
0
October
3.7
5
2
4
2
November
5.1
3
5
4
5
December
5.9
11
18
4
3
Average
4.2
7.0
3.8
3.9
2.9
2.2
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
2.8
3
2
2
3
5
February
4.0
4
6
3
5
4
March
4.1
4
4
5
4
5
April
4.9
4
6
5
4
May
3.7
3
4
4
4
June
3.6
3
4
3
4
July
1.8
2
2
1
2
August
1.6
1
1
2
1
September
2.1
2
1
2
2
October
2.9
2
2
4
4
November
3.1
3
4
4
4
December
2.2
2
1
5
2
Average
3.1
3.6
2.6
2.9
3.5
3.4
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
269°
190°
229°
164°
194°
February
228°
261°
004°
241°
228°
March
209°
259°
242°
231°
220°
April
216°
254°
334°
258°
May
266°
231°
258°
270°
June
247°
233°
258°
247°
July
246°
075°
139°
251°
August
269°
238°
253°
260°
September
244°
321°
187°
045°
October
066°
197°
192°
235°
November
220°
282°
196°
233°
December
202°
238°
176°
175°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.