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
89.3
73
96
94
91
89
February
88.4
95
90
91
83
95
March
94.3
98
89
96
95
89
April
95.0
96
96
99
93
May
95.0
93
93
96
95
June
99.0
99
100
98
100
July
98.6
99
99
98
100
August
97.6
99
99
99
100
September
96.0
97
99
100
91
October
92.5
95
98
96
86
November
92.7
92
92
100
94
December
90.5
89
73
94
93
Average
93.8
89.2
94.6
95.0
95.8
93.8
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
10.2
7
13
11
10
12
February
12.8
18
14
12
5
12
March
18.6
20
16
19
19
20
April
22.2
23
23
22
22
May
26.5
27
27
24
25
June
31.9
32
33
32
33
July
34.1
34
37
33
34
August
33.3
35
35
34
32
September
30.8
31
32
33
28
October
22.9
23
25
25
22
November
16.9
18
15
18
19
December
12.9
14
12
19
12
Average
21.8
14.9
23.2
23.7
22.8
22.4
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
-4
1
-3
1
2
February
0.9
5
2
-2
-4
1
March
6.6
8
5
5
8
9
April
10.0
10
11
10
10
May
16.2
16
17
15
15
June
21.2
21
21
21
22
July
23.4
23
25
22
24
August
22.4
23
23
23
21
September
19.3
19
18
20
17
October
11.3
12
11
14
10
November
4.9
6
5
6
7
December
2.3
3
3
6
1
Average
10.5
2.9
11.6
11.4
11.8
11.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.0
13
11
4
6
8
February
12.2
6
10
12
22
11
March
5.5
3
9
8
6
8
April
6.1
8
6
6
5
May
5.5
6
10
9
6
June
1.6
2
2
3
0
July
2.7
5
3
2
5
August
3.0
2
2
1
2
September
3.8
2
2
1
7
October
9.1
7
8
7
12
November
5.6
3
6
2
6
December
5.1
7
6
3
7
Average
5.7
7.0
5.8
5.5
5.4
6.1
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
9.2
8
9
9
9
9
February
9.8
10
9
11
10
9
March
10.6
11
11
11
11
10
April
11.0
11
13
11
10
May
9.2
7
11
9
9
June
8.6
7
9
8
9
July
7.4
8
8
7
8
August
7.4
7
7
9
7
September
7.9
8
7
9
7
October
9.2
10
8
9
9
November
9.0
8
9
9
10
December
8.8
9
9
9
8
Average
9.1
9.6
8.4
9.3
9.1
8.6
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
298°
259°
326°
285°
168°
February
187°
207°
301°
359°
315°
March
178°
218°
216°
169°
168°
April
188°
170°
190°
158°
May
146°
160°
125°
094°
June
156°
156°
163°
176°
July
189°
173°
163°
157°
August
185°
155°
163°
140°
September
148°
149°
163°
166°
October
175°
223°
199°
158°
November
173°
190°
176°
180°
December
212°
212°
184°
266°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.