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
98.1
99
98
100
99
98
February
96.2
100
97
99
100
100
March
98.8
98
100
99
100
100
April
98.8
99
99
100
97
May
99.3
100
99
100
100
June
99.1
100
99
100
99
July
99.5
100
98
100
100
August
99.6
100
100
100
98
September
99.1
99
100
99
99
October
99.0
98
100
100
100
November
99.1
100
100
100
98
December
98.5
100
99
98
97
Average
98.8
98.8
99.2
99.2
99.6
98.9
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
15.0
15
12
16
15
16
February
17.0
16
13
18
18
19
March
19.9
19
16
24
19
17
April
26.4
26
27
27
24
May
30.0
30
31
31
31
June
36.0
32
36
38
35
July
39.6
41
39
40
39
August
38.2
36
38
39
40
September
33.8
31
34
35
36
October
27.0
26
28
25
30
November
20.4
19
17
24
20
December
14.7
16
12
14
15
Average
25.8
16.7
24.9
26.9
27.2
27.2
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
2.1
2
2
1
1
1
February
3.6
5
1
2
3
3
March
6.7
7
5
7
4
7
April
11.6
10
11
11
11
May
14.9
14
15
16
16
June
20.2
18
20
23
19
July
25.0
26
25
26
22
August
23.0
21
24
23
21
September
18.4
18
20
18
17
October
11.2
11
12
9
13
November
4.9
4
2
7
4
December
1.2
2
-1
2
-1
Average
11.5
4.8
11.0
11.7
12.2
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.2
6
6
0
0
0
February
3.2
11
5
1
0
0
March
2.5
6
6
0
1
1
April
0.6
0
0
0
4
May
0.6
0
0
0
0
June
0.1
0
0
1
0
July
0.4
0
1
1
0
August
0.8
3
0
1
0
September
0.5
2
0
0
0
October
0.1
0
0
0
0
November
1.0
0
2
0
0
December
2.5
3
2
3
0
Average
1.9
7.5
2.1
0.4
0.5
0.3
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
6.4
7
9
6
7
5
February
7.6
7
10
9
8
6
March
8.8
10
10
9
10
8
April
8.3
8
10
9
6
May
7.9
8
10
8
8
June
7.2
7
8
7
8
July
5.8
7
7
5
6
August
5.6
6
5
6
6
September
5.9
6
5
6
5
October
6.0
6
5
7
6
November
6.2
6
8
6
7
December
5.5
4
6
7
6
Average
6.9
7.7
7.0
7.3
7.2
6.6
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
168°
283°
002°
145°
239°
February
168°
207°
312°
313°
341°
March
203°
215°
289°
251°
223°
April
226°
233°
238°
254°
May
212°
233°
219°
217°
June
191°
208°
192°
202°
July
186°
168°
168°
188°
August
184°
153°
182°
186°
September
175°
164°
180°
075°
October
267°
168°
217°
177°
November
260°
216°
176°
207°
December
107°
194°
195°
333°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.