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
91.5
83
93
98
90
96
February
90.6
90
74
98
94
96
March
93.3
96
80
100
95
92
April
93.4
96
94
99
71
May
96.8
99
95
89
94
June
96.7
99
99
91
90
July
98.2
100
99
94
100
August
90.7
96
99
76
91
September
95.5
100
98
97
81
October
96.9
96
100
95
95
November
94.4
93
84
97
96
December
91.9
89
83
90
96
Average
93.7
89.5
93.3
95.9
92.2
91.3
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
6.3
7
3
9
6
7
February
7.6
8
6
11
8
11
March
10.4
10
5
14
11
10
April
15.8
16
15
18
17
May
20.8
21
19
22
21
June
26.8
24
27
31
26
July
32.8
33
33
35
32
August
31.6
30
33
31
32
September
26.4
24
28
27
30
October
19.3
20
22
17
23
November
10.9
12
5
13
11
December
6.1
9
0
5
7
Average
16.8
8.4
17.1
18.5
18.6
18.8
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
-5.3
-2
-7
-7
-4
-2
February
-6.4
-3
-6
-8
-5
-7
March
-3.0
-2
-5
-3
-5
-4
April
-1.6
-1
-3
-2
0
May
3.5
4
1
4
3
June
6.8
6
5
8
6
July
9.1
9
8
11
8
August
8.8
10
9
8
9
September
4.3
5
6
3
5
October
-2.4
0
-2
1
-2
November
-5.5
-4
-9
-3
-5
December
-6.3
-3
-10
-6
-7
Average
0.2
-3.7
0.8
-1.3
0.7
0.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.7
16
5
1
6
7
February
11.3
13
23
3
5
1
March
10.4
12
24
2
7
9
April
6.4
4
9
3
4
May
5.1
8
6
1
6
June
2.7
4
3
1
6
July
0.0
0
0
0
0
August
0.5
1
1
0
1
September
1.8
5
2
2
0
October
1.8
2
0
6
0
November
4.3
5
8
2
7
December
7.2
4
18
15
4
Average
5.8
13.7
6.9
4.0
3.6
3.7
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
5.3
6
6
4
6
6
February
6.1
7
6
5
6
4
March
6.9
8
8
6
7
7
April
7.2
7
8
7
6
May
6.1
5
7
6
7
June
5.4
4
6
5
6
July
4.5
4
4
4
5
August
4.4
4
5
5
5
September
4.6
5
4
4
5
October
4.3
4
3
6
3
November
4.4
4
4
4
5
December
4.2
4
4
6
3
Average
5.5
6.9
5.1
5.1
5.4
5.1
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
221°
179°
221°
192°
238°
February
209°
224°
270°
278°
314°
March
226°
225°
268°
226°
241°
April
249°
258°
302°
281°
May
251°
270°
305°
259°
June
308°
265°
260°
275°
July
271°
273°
277°
269°
August
265°
252°
295°
272°
September
257°
240°
272°
264°
October
221°
299°
219°
287°
November
235°
227°
233°
245°
December
192°
202°
221°
198°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.