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
85.5
86
73
82
91
February
86.5
94
95
87
90
85
March
92.6
94
96
90
94
90
April
94.1
95
94
97
93
May
93.5
92
95
91
96
June
93.6
92
93
93
95
July
93.6
95
93
86
95
August
91.6
80
92
94
92
September
91.1
94
95
94
72
October
86.3
84
83
90
83
November
85.9
90
89
85
91
December
81.9
80
81
74
91
Average
90.3
91.4
90.1
89.3
89.4
89.8
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
9.1
9
9
10
10
February
8.5
10
8
10
8
10
March
12.6
13
12
13
13
12
April
14.1
14
14
18
7
May
20.5
23
17
19
21
June
23.4
24
22
27
22
July
27.5
29
28
28
26
August
27.9
28
29
27
27
September
23.4
23
25
23
25
October
16.9
17
20
16
17
November
11.2
11
10
12
11
December
8.2
11
6
6
10
Average
16.4
10.7
18.5
17.2
17.1
16.4
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
2.0
2
2
3
4
February
1.2
3
0
2
2
2
March
2.3
3
1
5
2
2
April
4.2
5
3
4
1
May
8.3
10
7
7
9
June
10.5
10
11
12
11
July
12.1
12
13
13
12
August
12.8
13
14
13
12
September
10.8
11
11
11
12
October
6.3
7
8
7
8
November
3.3
3
0
5
4
December
1.9
4
0
1
2
Average
5.9
2.6
6.9
6.4
6.5
6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
20.6
45
12
22
24
February
24.3
44
10
14
24
15
March
18.7
33
14
12
15
18
April
16.3
22
16
10
6
May
10.4
8
19
12
10
June
7.8
7
13
12
9
July
3.0
3
6
3
2
August
3.2
6
6
4
4
September
12.8
20
7
10
19
October
18.8
34
25
11
17
November
21.0
31
18
22
25
December
25.2
51
22
26
19
Average
17.0
40.1
17.7
13.6
13.4
13.2
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
2.4
2
2
2
4
February
2.5
2
3
2
4
3
March
2.8
3
3
2
3
3
April
3.1
3
3
3
3
May
1.9
1
2
2
2
June
1.8
2
1
2
2
July
1.7
1
1
2
2
August
1.7
1
2
2
2
September
1.7
2
1
2
2
October
1.9
1
2
2
3
November
2.1
1
1
2
3
December
1.7
1
1
2
2
Average
2.1
2.0
1.6
1.8
2.2
2.6
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
213°
207°
200°
202°
February
205°
217°
218°
217°
217°
March
204°
216°
233°
213°
221°
April
217°
227°
272°
254°
May
243°
235°
239°
239°
June
269°
257°
253°
242°
July
256°
261°
263°
257°
August
264°
262°
237°
248°
September
228°
255°
230°
220°
October
210°
208°
207°
234°
November
217°
217°
205°
204°
December
205°
205°
207°
203°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.