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
82.3
76
67
91
79
86
February
84.9
86
85
88
86
82
March
91.7
89
89
96
93
84
April
95.0
93
94
98
97
May
95.7
95
93
98
95
June
92.0
89
92
93
94
July
91.3
87
87
96
94
August
89.8
88
86
89
92
September
86.3
88
90
89
91
October
88.8
92
94
83
88
November
90.4
95
86
96
93
December
82.2
79
58
85
86
Average
89.0
83.9
87.4
88.8
90.7
90.5
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
9.3
7
12
8
8
11
February
13.9
15
16
14
10
12
March
17.6
19
17
19
19
18
April
21.8
22
22
21
21
May
26.4
25
27
25
24
June
29.4
28
31
29
29
July
31.4
31
32
31
33
August
30.3
30
30
30
31
September
28.3
29
27
27
27
October
22.3
22
21
22
23
November
15.4
17
17
14
18
December
11.7
12
11
16
10
Average
20.5
13.6
21.7
21.8
21.0
21.3
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
0.8
-2
3
-2
1
3
February
3.5
3
5
1
1
3
March
6.0
7
6
6
6
9
April
9.1
9
9
8
8
May
15.1
14
16
13
13
June
18.8
17
20
20
18
July
21.3
21
22
21
22
August
20.7
21
21
21
21
September
17.7
17
16
18
17
October
11.0
11
8
13
11
November
4.2
5
6
2
6
December
2.7
2
4
6
0
Average
9.9
2.9
10.9
10.6
10.7
11.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.4
22
17
15
12
13
February
15.6
14
12
13
11
26
March
10.7
14
10
6
12
15
April
10.8
11
9
7
10
May
6.7
4
9
3
8
June
7.4
14
4
6
4
July
6.5
8
11
5
6
August
6.9
9
5
10
7
September
6.3
2
9
4
8
October
6.6
6
2
9
6
November
6.6
8
10
1
7
December
14.4
20
30
10
11
Average
10.0
16.7
9.9
9.4
7.4
9.7
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
2.9
2
2
3
3
3
February
3.1
3
3
3
3
4
March
3.7
3
3
4
3
4
April
3.4
3
3
3
3
May
2.5
2
2
2
2
June
2.2
2
2
2
2
July
1.9
1
2
2
2
August
1.9
2
2
2
2
September
1.8
1
2
2
2
October
1.9
2
2
2
2
November
2.3
2
2
2
2
December
2.5
2
2
3
3
Average
2.5
2.6
2.1
2.2
2.3
2.5
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
253°
232°
245°
270°
230°
February
230°
226°
215°
266°
240°
March
248°
225°
224°
239°
226°
April
253°
239°
251°
243°
May
262°
242°
152°
257°
June
274°
071°
230°
211°
July
261°
225°
272°
248°
August
270°
258°
010°
189°
September
288°
272°
307°
074°
October
283°
275°
284°
125°
November
052°
238°
267°
253°
December
270°
175°
219°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.