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
87.4
84
86
88
89
90
February
89.3
97
99
87
92
84
March
94.7
91
96
99
97
93
April
96.3
98
95
97
95
May
95.8
96
99
98
92
June
96.4
91
98
96
98
July
96.9
96
93
98
99
August
97.2
95
98
99
96
September
95.5
99
98
96
95
October
93.7
96
97
96
91
November
92.6
98
90
96
97
December
90.6
95
68
93
92
Average
93.8
90.5
95.2
93.6
95.7
93.7
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
7.4
6
11
6
6
10
February
11.6
15
15
11
5
10
March
15.8
18
16
17
18
17
April
20.7
22
19
20
19
May
25.8
25
27
24
24
June
29.8
29
31
30
30
July
31.7
31
33
31
32
August
30.6
30
31
32
30
September
28.3
29
27
28
27
October
21.7
22
21
23
21
November
14.0
16
15
14
17
December
10.7
12
10
15
9
Average
19.7
12.6
21.5
21.0
20.5
20.4
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
-1.5
-2
3
-4
0
2
February
1.7
2
4
0
-3
1
March
5.1
7
5
6
6
7
April
9.6
10
9
10
9
May
15.8
15
17
14
14
June
20.0
19
21
21
20
July
22.6
23
23
22
23
August
21.4
21
22
22
21
September
18.2
18
17
18
17
October
11.5
12
9
14
11
November
4.2
5
5
3
7
December
2.2
3
3
5
0
Average
10.0
2.5
11.3
10.8
11.0
11.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.9
25
18
21
15
20
February
15.2
4
7
19
19
22
March
10.5
9
13
8
7
13
April
10.2
4
15
13
12
May
8.3
5
6
7
16
June
5.6
10
2
8
5
July
5.0
3
8
5
6
August
4.3
3
3
6
4
September
5.6
2
2
9
4
October
7.8
6
6
9
9
November
9.7
5
13
8
9
December
11.1
12
12
9
10
Average
9.5
12.7
7.0
8.9
9.1
10.3
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
8.1
8
9
8
7
8
February
8.3
8
9
8
8
8
March
9.2
9
10
10
9
9
April
8.5
9
9
8
8
May
7.9
7
9
7
7
June
7.2
7
7
8
8
July
6.4
7
7
6
6
August
6.6
9
6
6
6
September
6.1
5
7
7
6
October
7.1
7
8
7
6
November
7.4
7
8
7
8
December
7.6
8
6
9
8
Average
7.6
8.6
7.7
7.7
7.3
7.2
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
250°
247°
283°
255°
226°
February
243°
230°
229°
324°
268°
March
242°
241°
233°
215°
243°
April
238°
218°
238°
263°
May
022°
194°
206°
244°
June
338°
247°
205°
228°
July
242°
257°
248°
248°
August
189°
223°
210°
290°
September
329°
304°
209°
220°
October
260°
238°
210°
213°
November
237°
234°
225°
228°
December
230°
199°
211°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.