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
92.1
93
89
81
99
96
February
87.0
88
77
77
92
96
March
90.6
84
88
93
86
95
April
94.4
97
98
93
81
May
86.8
85
83
93
94
June
83.8
81
71
86
83
July
73.8
68
60
83
78
August
76.1
80
62
80
83
September
80.1
77
70
84
81
October
90.2
96
80
99
89
November
90.8
82
91
95
96
December
91.8
90
80
89
97
Average
86.7
87.7
83.6
77.4
89.2
88.0
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
5.6
5
7
6
6
3
February
4.8
6
5
7
4
6
March
7.5
9
7
8
6
7
April
10.2
10
9
11
10
May
13.4
15
12
12
15
June
15.1
16
15
17
14
July
16.9
17
17
17
17
August
17.4
19
18
17
16
September
15.7
16
17
14
16
October
11.4
13
14
8
11
November
7.3
9
5
6
7
December
5.0
8
1
1
8
Average
10.4
6.5
11.6
10.9
9.7
10.7
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
1.1
1
3
1
2
-1
February
-1.5
0
1
2
-1
2
March
1.1
1
0
3
2
0
April
3.4
3
2
3
4
May
7.0
8
6
7
7
June
9.6
9
10
11
9
July
11.7
12
12
12
11
August
11.9
12
13
12
13
September
9.9
10
10
10
11
October
5.7
6
8
2
6
November
3.2
5
0
3
3
December
0.7
3
-4
-5
3
Average
4.8
0.6
6.0
5.4
4.6
5.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
38.5
41
56
46
27
31
February
35.0
28
59
54
39
26
March
29.8
25
29
44
46
27
April
27.7
41
30
24
21
May
22.1
22
35
24
15
June
21.6
15
21
25
29
July
17.5
19
24
7
27
August
18.9
14
22
20
37
September
27.0
32
35
42
26
October
28.2
30
37
27
24
November
36.4
49
33
34
43
December
34.9
55
33
24
38
Average
26.6
30.9
33.2
33.2
27.3
27.8
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
7.2
6
8
8
8
8
February
7.1
6
9
8
8
8
March
6.9
7
7
8
8
7
April
6.9
8
7
6
6
May
5.5
5
6
5
5
June
5.3
5
5
5
6
July
4.6
4
5
4
5
August
5.2
5
5
5
6
September
5.5
6
6
7
5
October
6.6
7
8
8
5
November
7.5
8
7
9
9
December
7.5
10
5
6
9
Average
6.2
6.2
6.4
6.2
6.4
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
121°
134°
137°
141°
118°
February
093°
143°
146°
137°
150°
March
142°
139°
144°
145°
142°
April
146°
145°
165°
167°
May
240°
176°
189°
164°
June
242°
205°
188°
183°
July
239°
191°
224°
182°
August
198°
213°
208°
155°
September
152°
148°
147°
151°
October
136°
151°
142°
115°
November
136°
133°
147°
129°
December
131°
106°
108°
133°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.