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
96.7
93
93
99
98
98
February
95.5
95
96
97
89
95
March
95.1
95
99
100
97
90
April
97.9
100
100
99
97
95
May
98.9
97
100
98
99
June
98.8
100
97
97
100
July
99.3
98
100
98
100
August
98.9
100
99
98
100
September
96.9
98
98
100
99
October
90.4
71
94
99
96
November
94.6
90
97
98
94
December
97.1
94
98
100
99
Average
96.7
95.8
94.8
98.2
97.4
97.1
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
11.0
9
11
12
10
12
February
13.5
15
14
12
12
13
March
17.9
17
17
18
17
18
April
23.1
23
23
25
21
23
May
27.7
27
30
27
30
June
32.3
30
32
32
33
July
33.4
36
33
30
34
August
31.5
34
26
30
34
September
29.3
30
29
30
28
October
22.0
24
21
23
24
November
16.8
18
14
19
16
December
12.6
13
13
16
12
Average
22.0
16.0
22.9
22.1
22.3
22.9
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
-4.8
-4
-2
-5
-4
-2
February
-3.5
1
-2
-6
-4
-2
March
1.9
2
2
0
0
4
April
5.2
6
4
6
4
5
May
10.5
11
11
10
12
June
15.1
15
16
15
11
July
16.0
19
15
6
17
August
15.5
19
6
16
17
September
13.2
15
11
14
11
October
6.5
7
8
7
5
November
1.4
2
0
2
3
December
-2.3
-1
-2
1
-3
Average
6.0
1.0
7.6
5.2
5.7
6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.1
0
2
1
1
3
February
2.2
1
4
3
2
4
March
2.8
2
1
4
5
5
April
1.4
0
1
0
1
3
May
1.1
2
0
3
0
June
2.2
2
6
7
0
July
0.4
0
1
1
1
August
1.3
1
4
2
0
September
1.7
1
0
0
1
October
4.4
0
8
3
3
November
2.1
2
3
0
1
December
2.1
5
0
1
1
Average
1.8
0.7
1.7
2.5
2.0
1.8
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
9.1
9
11
8
9
9
February
10.7
11
12
8
10
10
March
10.8
11
14
9
11
12
April
11.2
11
11
13
11
10
May
9.7
9
11
9
10
June
9.0
8
9
8
12
July
7.0
7
7
7
7
August
6.9
8
7
7
6
September
7.8
7
7
8
8
October
8.6
8
8
9
10
November
9.2
8
10
8
10
December
9.3
8
10
12
9
Average
9.3
10.4
9.1
8.9
9.0
9.2
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
250°
253°
259°
263°
241°
February
254°
245°
245°
252°
234°
March
254°
244°
254°
236°
232°
April
245°
238°
235°
201°
225°
May
195°
231°
171°
222°
June
223°
190°
154°
192°
July
162°
158°
163°
184°
August
191°
136°
182°
164°
September
203°
161°
179°
096°
October
194°
229°
233°
209°
November
255°
230°
238°
261°
December
278°
241°
250°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.