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
98.0
96
99
99
99
96
February
96.5
94
95
93
96
97
March
99.0
100
96
98
99
100
April
99.4
100
99
100
98
May
99.9
100
100
100
100
June
99.8
100
99
100
100
July
99.9
100
100
100
100
August
99.7
99
100
100
100
September
99.8
99
100
100
100
October
99.1
100
99
100
97
November
98.7
96
100
100
100
December
98.1
96
94
100
99
Average
98.8
96.8
98.3
98.5
99.5
99.0
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
9.3
9
8
10
9
9
February
12.5
13
11
11
13
12
March
17.0
16
14
17
16
17
April
22.4
22
24
22
22
May
27.2
26
29
27
29
June
32.2
31
31
32
33
July
33.6
37
34
32
34
August
32.2
33
31
32
34
September
29.0
29
30
29
28
October
21.7
24
20
22
24
November
15.2
15
13
17
17
December
9.7
10
10
12
9
Average
20.8
12.6
21.7
21.8
22.0
22.3
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
-3.9
-2
-2
-3
-3
-2
February
-1.2
1
-2
-4
-2
-1
March
3.5
3
2
3
2
5
April
7.4
6
8
7
8
May
12.4
13
13
13
14
June
17.6
16
18
19
17
July
20.8
23
21
20
21
August
19.2
20
19
19
20
September
16.0
17
17
17
14
October
8.5
10
9
8
8
November
2.3
3
0
4
4
December
-2.4
-1
-1
0
-3
Average
7.7
0.7
8.8
8.6
8.7
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.2
4
4
1
2
6
February
4.4
6
4
7
5
6
March
3.3
3
13
3
1
2
April
1.6
0
0
1
3
May
1.3
2
0
2
0
June
1.7
0
5
4
0
July
0.4
0
1
1
1
August
1.5
2
5
1
0
September
1.8
3
1
4
1
October
2.3
1
5
1
3
November
2.2
9
0
1
0
December
1.8
3
3
0
1
Average
2.3
4.0
3.2
2.4
1.8
1.7
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
6.4
6
8
5
7
7
February
8.0
8
9
7
9
7
March
8.5
9
10
8
9
8
April
9.0
9
10
9
8
May
8.7
9
10
9
8
June
7.2
7
7
7
8
July
6.1
6
6
6
6
August
6.0
8
7
6
5
September
6.1
6
6
6
7
October
7.0
6
7
7
6
November
5.8
6
7
4
7
December
5.8
6
6
6
6
Average
7.1
7.5
7.4
7.2
6.9
6.9
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
276°
285°
337°
337°
329°
February
277°
258°
072°
243°
279°
March
216°
234°
262°
241°
229°
April
274°
253°
239°
254°
May
160°
235°
189°
203°
June
229°
161°
123°
222°
July
183°
203°
181°
277°
August
180°
102°
207°
232°
September
223°
187°
215°
071°
October
204°
095°
273°
149°
November
083°
218°
314°
236°
December
336°
274°
258°
332°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.