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
90.6
88
87
72
93
95
February
89.3
93
88
89
90
85
March
95.2
95
95
88
98
97
April
97.2
93
100
99
97
May
95.1
92
95
94
96
June
96.6
92
95
98
99
July
97.8
99
97
96
98
August
89.5
95
96
93
95
September
87.8
89
89
93
70
October
88.9
86
81
94
82
November
92.9
93
91
88
96
December
88.1
81
83
86
88
Average
92.6
91.7
91.1
90.5
93.7
91.7
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
7.9
6
9
7
9
8
February
7.2
9
8
8
6
8
March
11.2
11
12
12
12
10
April
14.1
13
13
16
15
May
18.7
21
15
18
19
June
20.9
21
20
24
20
July
23.7
24
24
24
23
August
24.1
24
26
23
23
September
20.7
20
22
20
22
October
15.0
15
18
14
14
November
10.3
10
8
11
10
December
7.1
9
4
4
9
Average
14.4
8.8
15.5
15.1
15.1
15.2
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
1.9
1
4
1
3
2
February
1.1
3
2
2
2
2
March
3.1
3
2
5
3
2
April
5.9
5
5
6
6
May
9.4
10
8
9
10
June
11.9
11
12
13
12
July
13.6
14
14
14
13
August
13.7
14
15
14
13
September
11.4
11
11
11
12
October
7.0
7
8
8
8
November
4.0
2
0
6
5
December
1.6
4
-2
-1
3
Average
6.5
2.2
7.1
6.8
7.4
7.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.6
28
19
11
20
25
February
18.3
16
19
14
26
18
March
13.0
11
16
16
11
8
April
12.3
18
8
8
7
May
8.8
8
17
6
11
June
10.0
8
13
12
14
July
2.5
2
2
0
7
August
2.6
1
1
4
4
September
8.2
5
1
16
7
October
14.1
13
12
22
10
November
17.9
8
15
34
18
December
20.0
23
14
21
20
Average
12.2
18.0
11.0
9.8
13.9
11.6
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
7.4
7
6
6
7
10
February
7.6
7
7
6
8
5
March
7.0
6
7
6
7
8
April
7.0
8
7
6
6
May
5.8
6
6
6
6
June
6.5
7
6
6
6
July
6.4
7
5
7
6
August
5.9
6
6
6
6
September
5.4
6
6
5
5
October
5.6
5
5
7
6
November
6.9
4
6
7
8
December
6.2
4
7
9
6
Average
6.5
6.7
6.0
5.9
6.7
6.5
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
054°
106°
139°
144°
146°
February
085°
125°
074°
095°
170°
March
160°
138°
141°
181°
137°
April
171°
176°
201°
150°
May
189°
177°
194°
175°
June
188°
188°
197°
185°
July
190°
192°
189°
196°
August
202°
198°
187°
195°
September
191°
205°
179°
187°
October
037°
182°
146°
178°
November
111°
045°
161°
164°
December
108°
044°
052°
138°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.