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
93.1
96
97
96
96
96
February
89.2
94
93
92
93
85
March
93.1
90
98
96
99
98
April
93.0
94
99
100
98
96
May
95.2
95
100
95
100
June
93.9
99
96
94
100
July
92.1
100
99
97
100
August
91.2
98
97
95
100
September
82.4
98
98
98
94
October
90.2
96
91
100
95
November
92.7
93
94
100
95
December
95.6
96
98
99
99
Average
91.3
93.4
96.9
96.4
96.9
96.5
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
8.7
8
9
9
8
9
February
10.5
11
10
9
10
10
March
14.0
13
13
14
14
14
April
18.5
18
18
20
17
19
May
22.9
22
25
23
25
June
27.2
27
26
28
28
July
27.5
31
28
25
29
August
26.0
28
24
24
29
September
24.1
26
24
24
24
October
18.3
20
16
20
21
November
13.7
13
10
16
15
December
10.0
10
9
13
9
Average
17.9
12.6
18.8
18.1
18.2
19.2
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
-2.2
-3
-2
-2
-2
-1
February
-1.0
1
-2
-4
-3
-2
March
2.4
2
2
1
2
3
April
5.5
5
4
7
4
6
May
10.0
10
11
9
12
June
14.4
15
15
15
14
July
15.8
17
16
15
17
August
14.9
16
14
14
16
September
12.2
14
12
12
11
October
6.6
7
6
8
7
November
2.3
2
-1
4
4
December
-1.6
0
0
2
-2
Average
6.2
1.3
6.8
6.4
6.7
6.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
6
4
4
3
5
February
4.8
5
8
6
6
7
March
3.2
5
3
5
3
4
April
1.6
4
0
0
2
1
May
1.0
1
0
3
1
June
2.6
0
5
7
1
July
2.1
1
3
4
1
August
2.3
1
5
3
1
September
2.1
3
2
3
1
October
3.9
2
11
0
3
November
2.3
3
6
0
0
December
2.3
2
3
2
1
Average
2.8
4.8
2.2
4.0
2.9
1.9
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
10.3
11
12
8
11
10
February
11.8
12
14
11
11
10
March
12.4
12
15
11
13
13
April
12.3
12
12
14
11
12
May
11.3
10
13
11
10
June
9.3
11
8
9
10
July
7.2
8
7
6
8
August
6.7
8
7
6
6
September
7.3
8
7
7
8
October
9.0
9
8
10
9
November
8.9
9
9
8
10
December
10.2
10
11
13
10
Average
9.9
11.8
10.3
9.4
9.5
9.6
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
270°
253°
292°
280°
286°
February
263°
244°
252°
277°
285°
March
235°
243°
267°
237°
233°
April
242°
251°
242°
212°
256°
May
197°
239°
220°
222°
June
243°
193°
181°
216°
July
158°
154°
142°
160°
August
165°
124°
154°
151°
September
230°
153°
206°
042°
October
192°
251°
239°
284°
November
267°
255°
291°
242°
December
286°
257°
251°
288°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.