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
88.5
81
90
73
92
91
February
88.3
89
91
83
89
86
March
96.3
97
96
94
98
97
April
97.4
97
100
99
96
May
95.5
94
96
95
97
June
95.8
91
95
99
96
July
97.2
97
99
95
96
August
95.8
98
99
95
99
September
92.6
96
95
95
70
October
87.0
86
82
92
81
November
87.5
86
82
82
91
December
83.7
75
79
81
90
Average
92.3
89.0
91.9
90.8
93.1
91.0
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
8.9
8
9
8
9
10
February
8.6
10
8
9
8
10
March
12.1
13
12
12
12
11
April
15.1
13
13
17
16
May
20.0
22
16
18
21
June
22.8
23
22
26
22
July
26.2
27
26
26
25
August
26.6
27
28
26
26
September
22.3
22
23
22
24
October
16.1
16
19
15
16
November
11.0
11
9
12
11
December
8.4
10
6
6
10
Average
15.8
10.4
16.6
16.3
16.4
16.8
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
3.4
3
4
3
4
5
February
2.7
5
2
3
3
4
March
4.1
5
3
6
3
4
April
6.7
6
5
6
7
May
10.5
12
8
10
11
June
12.8
11
13
14
13
July
15.0
14
15
15
15
August
15.7
16
16
15
15
September
13.3
12
14
13
15
October
8.1
8
10
9
9
November
4.9
4
2
6
5
December
3.2
5
1
2
3
Average
7.9
4.3
8.0
8.1
8.3
8.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
19.2
22
15
14
22
33
February
16.9
14
11
13
18
12
March
12.0
11
7
11
10
9
April
11.3
20
8
5
5
May
6.3
4
14
4
9
June
6.1
5
9
6
13
July
1.2
0
2
0
1
August
1.3
1
3
0
1
September
5.6
7
2
6
6
October
8.8
9
6
15
4
November
16.8
8
19
26
17
December
18.1
23
12
18
17
Average
10.3
15.4
8.7
9.0
9.8
9.9
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
4.9
5
4
5
5
7
February
5.6
5
6
5
7
6
March
5.7
5
6
5
6
6
April
6.2
7
6
6
5
May
4.9
5
5
5
5
June
4.9
5
4
5
5
July
4.6
5
4
4
5
August
4.8
5
5
5
5
September
4.9
5
5
5
5
October
5.0
4
5
6
5
November
5.0
4
4
6
6
December
4.6
4
4
6
5
Average
5.1
4.9
4.8
4.7
5.4
5.4
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
161°
149°
163°
156°
170°
February
165°
171°
173°
175°
177°
March
190°
187°
188°
188°
189°
April
188°
192°
218°
214°
May
236°
191°
216°
210°
June
217°
221°
235°
196°
July
245°
248°
255°
231°
August
258°
244°
225°
254°
September
198°
268°
203°
237°
October
165°
207°
167°
192°
November
166°
168°
174°
177°
December
157°
140°
173°
166°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.