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
98.2
96
99
100
99
100
February
98.9
98
100
98
100
100
March
99.1
99
99
99
100
98
April
98.9
95
99
99
100
98
May
88.3
100
99
100
16
June
93.9
100
96
100
63
July
98.9
100
94
100
100
August
96.9
89
100
99
100
September
99.5
100
100
100
99
October
99.9
100
100
100
100
November
100.0
100
100
100
100
December
99.3
99
98
100
100
Average
97.5
97.1
98.7
98.3
99.7
88.7
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
14.1
14
12
15
14
14
February
16.6
16
15
17
18
18
March
20.4
20
17
23
20
19
April
27.1
26
27
28
28
26
May
27.5
31
32
33
7
June
35.8
34
38
40
24
July
39.9
43
40
41
41
August
37.2
36
37
40
41
September
34.6
34
34
36
37
October
27.3
28
28
25
31
November
19.7
19
16
23
20
December
14.1
16
13
14
14
Average
25.3
18.8
26.1
26.8
27.5
24.3
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
3.1
3
3
2
3
3
February
4.7
6
3
4
6
4
March
8.3
9
7
8
7
8
April
12.6
10
12
13
14
11
May
15.1
18
18
18
2
June
22.0
20
22
26
14
July
25.7
29
24
27
27
August
22.9
20
25
26
28
September
20.9
20
21
23
22
October
13.2
14
15
12
15
November
7.1
7
4
10
7
December
3.1
4
2
4
2
Average
12.5
7.0
13.0
13.2
14.6
11.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.4
5
9
0
2
0
February
3.8
12
2
1
0
1
March
3.0
7
5
0
2
2
April
0.7
1
0
1
0
3
May
0.5
0
0
0
0
June
0.1
1
0
0
0
July
0.6
0
2
1
0
August
0.4
0
1
1
0
September
0.3
1
1
1
0
October
0.2
0
0
1
0
November
1.1
0
2
0
0
December
2.2
1
3
3
0
Average
1.8
6.1
1.5
0.7
0.8
0.5
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
6.2
6
8
5
6
5
February
8.0
7
9
8
8
6
March
9.2
10
10
8
9
9
April
9.2
8
9
11
9
7
May
8.2
9
10
9
2
June
8.5
9
9
9
6
July
8.0
9
8
6
9
August
7.4
7
6
8
8
September
7.5
6
8
8
6
October
6.5
6
6
8
6
November
6.4
7
7
6
6
December
5.8
4
6
8
6
Average
7.7
8.0
7.8
7.8
7.8
6.3
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
357°
238°
028°
116°
031°
February
218°
232°
357°
342°
026°
March
223°
214°
258°
231°
210°
April
213°
254°
231°
232°
207°
May
197°
221°
224°
223°
June
206°
217°
209°
200°
July
210°
199°
201°
207°
August
210°
200°
204°
214°
September
216°
192°
212°
054°
October
357°
025°
211°
044°
November
354°
040°
031°
243°
December
058°
193°
197°
034°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.