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
90.5
75
85
100
93
92
February
88.2
95
86
88
77
89
March
94.2
92
96
98
99
84
April
94.8
94
98
91
93
May
97.5
98
99
92
99
June
97.6
90
98
98
100
July
98.8
99
100
97
100
August
98.7
100
97
99
100
September
94.2
94
100
99
89
October
93.3
90
96
98
94
November
91.7
91
95
93
95
December
91.4
93
78
99
95
Average
93.7
87.0
93.1
96.3
95.0
94.3
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
14.8
12
17
16
13
17
February
16.6
21
17
15
10
16
March
22.0
22
21
23
22
22
April
26.0
26
30
24
25
May
30.4
29
35
27
32
June
34.1
34
37
33
34
July
36.2
38
39
33
36
August
35.8
39
35
35
37
September
31.2
34
33
34
29
October
25.6
26
26
28
26
November
19.8
20
17
21
22
December
16.9
18
17
24
16
Average
24.9
18.3
26.6
27.1
25.3
26.0
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
1.0
0
4
-2
1
3
February
2.7
7
2
-2
-1
2
March
8.2
9
8
5
8
11
April
11.2
11
13
10
11
May
17.1
17
19
16
17
June
21.3
22
22
21
21
July
22.0
24
26
20
24
August
19.6
25
23
20
22
September
17.1
21
20
18
17
October
12.4
13
13
14
11
November
6.2
7
6
7
8
December
3.3
5
6
7
2
Average
11.1
5.2
13.2
12.7
11.9
12.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.6
8
8
2
6
4
February
6.9
1
15
11
12
7
March
2.5
4
2
4
1
5
April
2.6
2
4
4
3
May
2.3
4
3
2
2
June
1.6
5
1
2
1
July
1.3
1
1
3
1
August
3.0
1
7
3
2
September
4.9
6
3
1
7
October
5.5
6
8
2
3
November
3.8
4
6
2
2
December
4.4
7
5
0
5
Average
3.6
4.3
4.9
4.2
2.9
3.4
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
10.0
9
11
9
10
9
February
10.5
12
11
10
11
10
March
11.7
12
12
13
14
9
April
12.3
12
14
12
11
May
11.1
9
13
10
11
June
10.0
8
11
8
11
July
8.5
9
10
7
9
August
8.5
9
8
10
8
September
8.2
9
8
8
7
October
9.8
10
9
10
10
November
9.7
9
10
10
11
December
9.3
11
8
9
10
Average
10.1
10.9
9.9
10.3
9.8
9.7
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
234°
244°
279°
311°
227°
February
239°
227°
290°
011°
267°
March
180°
177°
233°
160°
180°
April
127°
166°
125°
161°
May
137°
167°
123°
139°
June
126°
154°
143°
151°
July
158°
157°
146°
149°
August
143°
124°
155°
153°
September
162°
143°
141°
040°
October
137°
152°
166°
139°
November
185°
183°
174°
173°
December
196°
181°
206°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.