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
81.9
78
77
89
84
78
February
85.3
90
90
83
80
88
March
92.7
95
90
96
92
90
April
94.5
95
95
96
96
May
87.6
98
95
96
98
June
80.3
96
98
90
98
July
88.2
94
96
93
99
August
95.6
95
96
97
93
September
81.0
96
96
94
4
October
82.5
89
96
72
50
November
84.3
89
90
78
86
December
83.9
87
69
76
92
Average
87.5
88.1
91.8
93.0
88.1
81.3
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
8.3
5
11
8
8
9
February
11.7
16
14
10
4
10
March
16.9
19
16
18
18
17
April
19.2
22
21
21
20
May
25.2
28
27
25
25
June
30.8
31
32
30
31
July
32.4
32
34
32
33
August
30.9
31
31
31
31
September
29.2
30
29
29
27
October
22.6
24
23
24
21
November
14.9
16
15
15
18
December
11.9
12
10
16
10
Average
20.6
13.3
22.1
21.7
21.1
21.1
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
0.5
-3
4
-3
1
2
February
2.1
5
5
-1
-4
2
March
6.5
8
6
6
7
9
April
9.0
11
10
10
10
May
15.4
15
17
15
16
June
20.9
20
21
23
21
July
22.9
22
24
22
24
August
20.6
21
21
22
19
September
17.4
17
17
18
15
October
10.8
11
9
14
9
November
4.4
5
5
4
7
December
3.1
4
4
6
1
Average
10.5
3.2
11.7
11.0
11.5
11.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.2
0
0
0
0
0
February
0.6
0
0
0
0
0
March
0.7
0
0
0
0
0
April
0.9
0
0
0
0
May
2.6
0
0
0
0
June
4.8
0
0
0
0
July
5.9
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
2.1
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
8.3
7
9
8
8
8
February
9.2
10
10
8
8
9
March
9.9
10
10
10
10
10
April
9.8
10
10
9
8
May
8.5
8
10
8
8
June
6.9
6
7
7
8
July
5.7
6
6
5
6
August
5.4
6
5
6
5
September
5.9
5
6
6
7
October
7.7
8
9
8
7
November
7.8
7
8
8
8
December
8.3
8
8
10
8
Average
7.9
9.3
7.6
8.0
7.6
7.6
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
281°
256°
309°
353°
255°
February
212°
213°
223°
032°
322°
March
194°
194°
215°
160°
191°
April
211°
207°
220°
238°
May
100°
199°
147°
211°
June
012°
181°
192°
208°
July
202°
175°
145°
206°
August
184°
172°
150°
041°
September
055°
009°
141°
070°
October
247°
223°
220°
024°
November
220°
235°
225°
210°
December
242°
324°
203°
252°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.