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
84.3
96
77
76
78
93
February
85.1
89
80
87
83
March
94.1
97
91
100
95
92
April
95.7
95
96
97
97
May
94.4
96
92
98
94
June
93.4
92
97
95
94
July
91.8
91
90
95
92
August
89.2
81
88
91
87
September
91.9
91
92
89
93
October
93.2
97
96
86
92
November
95.1
97
91
98
December
88.4
93
68
88
Average
92.3
96.6
91.2
89.3
92.3
91.8
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
8.2
4
11
6
8
10
February
12.1
14
12
9
10
March
15.8
18
16
15
18
17
April
20.6
21
20
20
19
May
25.0
23
26
24
23
June
28.1
26
30
28
28
July
30.5
30
30
30
32
August
29.2
28
30
30
29
September
26.6
26
25
26
26
October
21.4
21
20
21
22
November
14.1
15
15
13
December
11.1
11
10
14
Average
19.7
14.1
19.7
20.5
20.5
21.6
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
-2.5
-1
1
-3
-1
1
February
0.8
2
-1
-1
1
March
2.9
4
2
2
3
6
April
5.8
6
6
4
6
May
10.6
10
14
11
10
June
13.2
14
16
17
16
July
16.4
18
20
18
19
August
17.0
18
18
18
19
September
13.4
14
13
13
15
October
7.9
8
4
10
9
November
0.4
0
3
-2
December
0.4
0
2
2
Average
6.7
2.2
7.2
8.1
7.9
10.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.6
2
10
8
8
13
February
12.5
8
4
11
23
March
8.9
8
6
0
7
15
April
8.2
6
6
5
10
May
7.8
5
7
4
10
June
5.4
5
2
4
2
July
3.3
1
6
3
3
August
4.2
9
2
8
3
September
5.0
2
6
5
7
October
5.4
3
2
8
2
November
4.7
5
6
1
December
8.0
10
12
4
Average
7.0
6.7
5.4
4.7
5.5
8.2
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
2.5
3
4
3
2
0
February
3.1
4
4
3
2
March
4.2
6
5
8
3
4
April
4.0
5
5
4
4
May
3.4
4
4
3
3
June
2.9
4
4
2
3
July
2.2
3
3
3
2
August
1.8
3
3
2
2
September
2.1
2
3
2
2
October
2.2
3
4
3
1
November
2.0
3
4
2
December
2.1
3
2
3
Average
3.1
5.1
3.5
3.6
2.6
2.3
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
283°
234°
245°
237°
360°
February
232°
236°
244°
243°
March
245°
247°
245°
225°
235°
April
238°
243°
235°
241°
May
260°
204°
228°
230°
June
240°
245°
175°
209°
July
232°
228°
219°
218°
August
222°
230°
206°
212°
September
276°
311°
216°
193°
October
237°
244°
209°
211°
November
244°
228°
222°
December
236°
221°
226°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.