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
93.7
89
90
98
95
February
94.0
91
96
97
85
92
March
95.1
93
99
96
98
96
April
97.0
99
96
97
May
98.3
97
98
99
June
98.6
97
96
100
July
99.8
100
100
August
98.3
100
94
100
September
95.3
96
98
98
October
92.5
94
94
93
November
89.0
91
93
93
December
95.3
87
97
99
Average
95.0
91.2
95.6
95.7
93.2
97.0
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
11.3
11
12
9
12
February
14.3
16
14
9
11
13
March
19.0
19
18
19
19
19
April
22.8
23
22
21
May
28.9
28
31
30
June
33.3
34
33
34
July
34.1
36
34
August
32.7
35
31
35
September
29.4
32
30
28
October
21.5
23
21
24
November
16.4
18
14
18
December
12.7
14
13
12
Average
21.0
15.2
24.0
23.3
13.5
23.6
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
-2.5
-4
-1
-1
0
February
-1.6
1
-1
-8
-3
-1
March
3.4
4
2
1
2
7
April
7.0
5
6
8
May
11.7
11
11
13
June
17.3
15
18
18
July
19.7
20
20
August
18.6
19
18
19
September
15.3
17
16
13
October
8.3
9
9
8
November
2.9
3
1
4
December
-1.1
0
-1
-1
Average
6.4
0.2
8.2
8.2
-1.3
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.4
12
4
1
4
February
4.6
7
5
0
12
4
March
3.5
7
2
3
5
5
April
1.2
1
0
1
May
0.9
2
0
0
June
0.7
1
0
1
July
0.5
1
1
August
2.4
1
8
1
September
1.7
3
0
1
October
5.1
1
11
7
November
3.2
7
5
1
December
3.5
9
3
1
Average
3.5
8.4
2.7
3.4
6.3
2.0
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
10.9
10
11
11
10
February
12.4
13
13
9
12
11
March
11.7
12
12
12
13
13
April
12.5
12
15
10
May
10.7
10
12
10
June
10.3
9
12
12
July
8.6
10
8
August
8.1
9
7
8
September
8.7
8
8
8
October
9.6
9
8
11
November
11.1
9
11
12
December
10.5
11
10
11
Average
10.7
11.4
10.2
10.6
12.0
10.2
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
248°
249°
295°
254°
February
252°
242°
194°
249°
244°
March
246°
243°
261°
247°
247°
April
233°
230°
244°
May
164°
234°
241°
June
213°
179°
213°
July
186°
200°
August
196°
140°
206°
September
212°
199°
328°
October
193°
208°
261°
November
240°
234°
247°
December
252°
246°
332°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.