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
84.9
79
84
89
84
87
February
87.5
97
97
91
91
73
March
91.0
91
88
99
93
86
April
95.2
99
94
96
94
May
92.3
97
91
94
95
June
95.6
97
98
93
93
July
95.9
96
97
95
96
August
94.3
97
94
94
93
September
93.7
94
95
92
92
October
92.2
93
98
89
89
November
91.3
94
93
93
92
December
89.0
87
84
92
92
Average
91.6
89.2
93.8
94.1
92.3
91.2
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
4.6
4
8
3
4
8
February
8.8
12
13
8
2
6
March
13.0
16
13
15
16
15
April
17.6
19
16
18
16
May
22.5
23
25
22
21
June
27.5
27
29
28
28
July
29.4
29
30
29
31
August
28.2
28
28
29
28
September
26.2
26
25
26
25
October
19.8
20
19
21
18
November
12.0
14
13
12
15
December
8.1
10
7
12
7
Average
16.8
10.4
19.2
18.7
18.3
18.4
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
-3.5
-3
1
-6
-2
0
February
0.2
1
2
-1
-5
0
March
2.8
5
2
3
3
6
April
7.1
7
7
7
6
May
11.6
11
14
10
12
June
16.7
15
17
18
17
July
19.6
19
21
19
21
August
17.7
18
18
19
17
September
15.4
14
15
16
14
October
9.7
9
7
12
9
November
2.7
3
4
1
5
December
0.3
2
1
3
-1
Average
7.3
0.8
8.6
8.5
8.5
8.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.9
0
10
13
12
13
February
11.0
0
4
14
13
17
March
7.6
0
10
4
5
9
April
8.0
4
10
11
11
May
8.0
1
9
9
10
June
4.7
0
4
9
5
July
5.4
0
10
5
6
August
4.1
0
5
6
4
September
2.8
0
3
6
3
October
5.6
0
2
8
10
November
6.6
0
8
7
8
December
5.4
0
7
5
6
Average
6.4
2.3
7.1
7.9
7.8
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
6.4
7
7
7
6
6
February
6.9
7
8
7
7
6
March
7.4
8
8
8
7
7
April
6.9
7
7
7
8
May
5.6
5
6
5
6
June
5.0
5
5
5
5
July
4.3
5
5
4
4
August
4.2
5
4
4
4
September
4.2
4
5
5
4
October
5.3
5
6
5
5
November
6.0
6
6
6
7
December
5.8
5
5
7
6
Average
5.8
7.1
5.6
5.8
5.5
5.5
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
254°
239°
262°
254°
237°
February
254°
238°
239°
310°
257°
March
259°
247°
240°
251°
244°
April
242°
234°
250°
264°
May
097°
205°
260°
264°
June
294°
245°
218°
246°
July
245°
236°
259°
240°
August
259°
241°
206°
265°
September
024°
281°
242°
201°
October
264°
242°
232°
237°
November
241°
235°
237°
240°
December
235°
227°
221°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.