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
82.1
76
82
93
86
77
February
87.0
93
97
88
92
85
March
91.4
96
90
98
91
88
April
95.2
94
100
97
96
94
May
94.3
97
95
96
89
June
96.6
96
99
94
98
July
94.5
96
93
90
92
August
96.5
94
98
97
96
September
94.9
97
96
96
92
October
90.5
94
95
90
85
November
92.1
97
91
98
94
December
88.0
86
81
86
94
Average
92.0
90.6
94.2
94.4
92.8
90.4
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
4.8
3
8
3
4
6
February
8.6
13
11
6
1
7
March
13.6
17
12
14
16
14
April
19.0
20
20
18
19
18
May
24.8
25
25
23
21
June
29.7
30
30
29
30
July
30.5
31
30
29
31
August
29.2
29
29
30
28
September
27.6
27
27
28
26
October
20.7
21
20
22
19
November
12.6
15
13
12
16
December
8.8
10
7
13
8
Average
18.2
12.9
19.8
18.9
18.8
18.3
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
-3.2
-4
1
-7
-2
-1
February
-2.6
0
1
-5
-7
-2
March
3.2
5
2
2
5
5
April
7.6
10
7
7
7
6
May
13.6
13
14
12
13
June
16.8
17
18
19
19
July
18.9
20
21
19
21
August
18.8
19
19
20
18
September
15.0
14
14
15
14
October
9.1
9
6
12
7
November
2.0
2
2
0
4
December
-1.8
2
0
2
-2
Average
7.5
2.5
8.8
7.9
8.6
8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.9
12
9
8
15
13
February
9.9
3
5
17
12
19
March
8.4
3
9
10
9
10
April
7.5
8
3
8
7
9
May
5.7
3
5
5
8
June
3.2
1
3
3
6
July
4.0
3
8
8
3
August
3.3
3
2
4
3
September
3.4
3
2
6
1
October
7.0
5
4
6
10
November
5.7
3
5
2
9
December
8.1
9
9
8
6
Average
6.4
6.4
4.4
6.4
6.8
7.8
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
8.8
9
10
10
9
8
February
9.3
10
10
9
9
10
March
9.9
11
11
10
10
10
April
9.7
11
10
11
10
9
May
7.9
8
10
8
9
June
6.8
8
7
7
7
July
5.5
7
6
5
6
August
5.5
6
6
6
6
September
6.1
5
6
7
7
October
8.3
9
9
9
9
November
8.7
8
10
9
10
December
8.8
9
8
10
9
Average
8.1
10.1
8.2
8.3
8.1
8.1
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
263°
257°
289°
275°
240°
February
256°
235°
254°
347°
298°
March
222°
236°
224°
161°
230°
April
234°
226°
218°
242°
259°
May
084°
191°
166°
231°
June
008°
229°
203°
206°
July
232°
218°
249°
190°
August
226°
236°
175°
125°
September
168°
311°
226°
212°
October
249°
227°
225°
247°
November
245°
223°
237°
217°
December
219°
198°
217°
246°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.