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
88.1
86
93
88
90
February
88.1
94
94
93
65
March
88.2
82
92
88
92
April
91.9
92
91
95
May
88.2
94
80
96
June
92.6
91
97
93
93
July
86.7
96
96
98
97
August
86.9
97
97
94
82
September
86.3
76
95
98
87
October
84.6
86
79
92
84
November
71.7
100
92
98
43
December
81.0
86
80
93
92
Average
78.9
87.0
91.0
90.1
92.8
83.4
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
7.9
8
11
7
6
February
10.6
10
13
12
5
March
13.3
15
14
16
13
April
19.1
22
19
18
May
23.7
21
25
23
June
27.3
26
29
27
28
July
29.9
30
31
29
31
August
29.0
29
30
28
28
September
25.2
26
26
25
23
October
20.2
20
18
23
20
November
13.6
7
16
14
14
December
9.9
11
9
13
9
Average
17.1
10.8
20.1
20.1
19.4
21.2
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
0.0
1
3
-1
-1
February
1.7
1
3
2
-1
March
3.4
5
3
5
3
April
8.1
10
8
9
May
13.9
11
15
13
June
17.7
15
18
18
19
July
21.0
21
22
20
22
August
20.7
20
21
21
20
September
16.4
16
17
17
16
October
9.6
13
8
15
4
November
3.6
4
6
4
1
December
1.8
2
1
4
1
Average
8.1
2.1
10.6
10.5
10.7
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
0.0
0
0
0
0
February
0.0
0
0
0
0
March
0.0
0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
0.0
0
0
0
0
July
0.0
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
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
5.1
5
5
5
4
February
4.6
4
5
5
4
March
5.9
6
6
6
5
April
5.6
5
6
6
May
4.1
4
4
4
June
4.0
4
4
4
4
July
3.4
3
3
4
3
August
3.4
4
3
3
3
September
3.4
3
3
4
3
October
3.6
3
3
4
3
November
3.7
2
4
4
2
December
4.2
4
4
4
5
Average
4.3
5.1
4.3
4.3
4.1
3.3
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
251°
255°
270°
284°
February
243°
245°
236°
286°
March
262°
269°
229°
271°
April
213°
259°
265°
May
294°
064°
231°
June
218°
222°
208°
179°
July
201°
216°
221°
209°
August
214°
238°
213°
160°
September
308°
271°
226°
012°
October
270°
306°
253°
236°
November
010°
256°
278°
202°
December
259°
266°
239°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.