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
86.6
86
58
96
82
86
February
90.5
98
96
88
90
91
March
92.7
95
94
97
95
92
April
94.4
99
95
94
96
May
95.5
97
95
95
95
June
96.9
96
99
96
97
July
95.6
96
97
92
94
August
95.7
91
96
97
96
September
95.3
94
97
96
93
October
91.8
94
97
91
87
November
89.5
90
92
95
91
December
94.1
95
91
93
96
Average
93.5
93.3
94.7
95.4
93.2
93.0
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
5.4
3
18
6
5
6
February
9.9
16
13
9
3
8
March
14.5
18
14
16
16
15
April
19.9
22
20
20
19
May
25.0
26
26
23
22
June
29.9
31
31
30
30
July
31.2
32
33
30
31
August
29.7
30
30
31
29
September
28.0
28
27
29
26
October
20.6
22
21
23
19
November
13.6
16
14
15
16
December
9.7
12
8
15
8
Average
19.1
12.3
22.3
20.4
20.0
19.1
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
-4.9
-4
10
-7
-1
-1
February
-2.3
1
2
-5
-5
-2
March
3.4
5
2
3
5
5
April
7.4
7
8
7
7
May
13.9
13
15
13
13
June
18.5
17
19
20
19
July
20.6
20
21
20
21
August
19.0
20
19
20
18
September
15.8
16
14
16
14
October
8.7
9
7
11
7
November
2.0
2
3
2
4
December
-1.7
3
1
2
-2
Average
7.9
0.4
10.3
8.4
9.1
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.3
13
0
5
12
14
February
7.0
3
5
12
14
8
March
6.8
5
8
6
6
7
April
6.1
1
8
9
7
May
3.8
1
4
5
3
June
1.5
1
1
2
2
July
2.3
1
2
2
7
August
1.6
3
2
0
1
September
1.0
0
1
2
1
October
4.8
5
2
7
8
November
4.3
3
10
0
4
December
5.6
7
3
3
5
Average
4.5
6.5
2.9
4.5
4.7
5.1
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
6.0
4
2
7
6
6
February
5.6
5
6
6
5
6
March
6.8
7
7
7
7
7
April
7.0
7
8
7
8
May
5.3
4
7
5
6
June
4.0
3
4
3
5
July
2.5
2
2
1
4
August
2.7
3
2
1
3
September
3.5
3
3
4
4
October
5.8
6
5
6
6
November
5.4
4
6
6
7
December
5.8
6
5
6
6
Average
5.0
5.6
4.4
5.2
4.4
5.5
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
226°
107°
307°
285°
232°
February
211°
227°
265°
307°
310°
March
208°
207°
231°
192°
231°
April
212°
217°
246°
278°
May
191°
169°
162°
293°
June
287°
214°
190°
182°
July
259°
275°
270°
167°
August
280°
170°
174°
185°
September
174°
297°
184°
240°
October
262°
272°
248°
286°
November
241°
230°
251°
208°
December
229°
206°
225°
260°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.