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
91.9
84
94
97
93
February
92.7
98
94
94
83
March
95.6
92
94
99
98
April
94.2
96
99
87
May
95.7
97
99
91
June
98.4
98
100
97
July
98.9
100
100
97
August
99.0
100
99
99
September
99.1
97
100
100
October
98.3
97
100
98
November
91.7
86
90
98
December
91.3
91
82
98
91
Average
94.1
91.5
95.7
97.2
95.2
91.1
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
15.9
14
19
16
15
February
17.7
21
20
16
15
March
23.3
23
24
24
23
April
26.7
26
30
25
May
30.3
29
35
27
June
34.8
36
36
32
July
36.6
39
39
33
August
36.4
40
35
34
September
33.8
36
33
33
October
27.7
28
27
29
November
19.9
20
18
21
December
20.2
19
18
24
19
Average
23.8
18.9
27.9
27.6
26.0
18.5
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
1.7
1
4
0
2
February
3.6
7
5
0
3
March
9.0
11
11
6
9
April
13.6
13
16
12
May
18.3
18
20
17
June
22.1
22
23
21
July
23.7
25
25
22
August
23.3
25
24
22
September
20.1
22
19
19
October
14.1
15
13
15
November
8.4
10
8
8
December
6.4
4
9
9
3
Average
10.1
6.0
14.5
13.7
13.3
3.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.0
5
4
2
6
February
2.9
2
3
3
4
March
0.9
1
1
1
1
April
2.2
2
1
4
May
2.6
2
1
6
June
1.2
1
1
2
July
1.2
0
1
3
August
2.3
0
4
3
September
1.3
3
0
1
October
1.4
3
1
0
November
4.9
4
9
2
December
2.8
3
2
0
11
Average
4.0
2.6
1.9
1.9
2.5
10.8
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
7.7
7
8
7
9
February
8.2
8
9
8
9
March
9.1
8
9
10
10
April
9.4
9
11
9
May
7.9
6
10
8
June
6.8
7
8
6
July
6.3
6
7
6
August
6.5
7
6
6
September
5.7
7
5
6
October
7.1
8
6
7
November
6.3
6
6
7
December
7.0
7
7
7
9
Average
7.7
7.6
7.3
7.6
7.2
8.6
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
314°
270°
310°
260°
February
263°
256°
325°
339°
March
187°
176°
220°
166°
April
129°
160°
125°
May
141°
169°
123°
June
171°
147°
144°
July
165°
163°
142°
August
146°
142°
158°
September
154°
133°
129°
October
117°
160°
190°
November
232°
150°
168°
December
227°
172°
203°
186°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.