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
80.4
74
74
84
90
79
February
84.5
98
96
82
88
77
March
91.3
92
92
96
96
91
April
95.6
94
95
98
95
May
93.8
96
97
94
91
June
95.5
93
99
94
96
July
94.9
96
91
94
94
August
95.0
92
95
96
94
September
93.8
96
92
95
92
October
90.3
91
96
95
83
November
90.3
95
93
94
91
December
86.1
89
68
87
93
Average
91.1
88.2
92.2
91.8
93.6
89.9
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
6.1
4
9
4
6
7
February
10.2
15
13
8
4
8
March
14.7
18
14
16
18
16
April
19.9
21
19
20
18
May
25.4
25
26
24
23
June
29.8
30
31
30
30
July
31.1
32
32
30
32
August
29.9
30
30
31
29
September
28.2
29
28
28
27
October
21.2
22
21
23
20
November
13.1
15
14
13
17
December
9.9
12
8
14
9
Average
19.0
12.1
21.0
20.1
19.9
19.6
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
-2.2
-2
2
-5
-1
0
February
-1.9
1
2
-3
-5
-1
March
4.1
6
3
4
6
6
April
8.0
8
8
8
7
May
14.7
14
16
12
13
June
17.9
17
19
20
19
July
21.0
21
22
21
22
August
20.1
21
20
21
20
September
16.5
16
15
17
16
October
9.9
10
8
13
9
November
2.6
4
3
1
6
December
0.7
2
1
3
-1
Average
8.6
1.7
9.9
9.3
9.7
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.2
16
7
12
8
15
February
10.3
2
3
17
10
15
March
7.7
3
8
6
4
6
April
7.3
6
9
6
10
May
6.1
3
5
4
9
June
4.6
4
3
8
6
July
3.1
2
7
3
1
August
3.3
4
2
1
4
September
3.8
1
3
5
2
October
6.2
7
7
4
6
November
5.7
5
4
3
5
December
8.5
7
10
8
6
Average
6.5
6.7
4.6
6.5
5.2
6.7
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
7.3
7
7
8
7
6
February
7.8
8
9
8
8
8
March
8.5
9
9
9
8
9
April
8.0
8
8
8
7
May
7.2
6
8
7
7
June
6.5
7
6
7
7
July
5.5
6
6
6
5
August
5.5
6
6
6
5
September
5.6
5
6
6
6
October
6.6
7
7
7
6
November
7.0
7
7
7
7
December
7.2
7
7
8
7
Average
7.0
7.9
6.8
7.0
6.8
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
247°
261°
293°
253°
243°
February
259°
231°
257°
334°
284°
March
225°
233°
230°
164°
248°
April
230°
222°
241°
263°
May
066°
197°
190°
235°
June
003°
244°
206°
218°
July
235°
239°
238°
229°
August
238°
260°
183°
360°
September
245°
329°
226°
213°
October
244°
226°
225°
252°
November
238°
227°
227°
230°
December
224°
219°
215°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.