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
87.2
72
91
94
93
84
February
86.2
91
94
90
79
94
March
90.9
90
92
94
92
79
April
91.5
92
98
91
96
May
91.0
88
89
88
95
June
96.3
92
96
93
99
July
98.6
99
98
97
99
August
97.0
99
97
98
99
September
94.2
93
100
100
93
October
93.2
94
98
98
83
November
88.8
87
79
94
95
December
91.2
91
74
100
91
Average
91.5
84.2
92.7
93.0
93.6
92.5
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
10.1
7
12
12
9
11
February
11.8
15
13
12
4
11
March
17.8
18
16
18
18
18
April
21.9
22
25
20
21
May
26.6
27
29
24
27
June
32.4
31
33
32
33
July
35.0
35
38
33
35
August
33.8
36
34
34
34
September
30.1
32
32
33
27
October
22.4
24
23
25
22
November
15.8
16
13
18
18
December
12.1
13
11
18
12
Average
21.4
13.2
23.1
23.8
22.5
22.5
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
-2.0
-4
-1
-4
0
-1
February
-2.9
3
0
-3
-6
-1
March
4.4
5
3
3
5
7
April
7.9
7
10
7
8
May
14.0
15
16
14
14
June
19.8
18
21
20
20
July
21.8
21
24
21
22
August
21.2
21
22
22
20
September
17.8
19
18
19
14
October
9.8
11
11
11
8
November
3.7
5
2
5
6
December
0.4
2
1
3
-1
Average
8.8
1.2
10.2
10.2
10.1
9.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
7
5
3
1
6
February
5.4
12
2
9
7
4
March
3.7
5
5
5
4
6
April
2.7
4
1
3
1
May
3.1
5
5
6
1
June
1.7
4
1
3
0
July
0.8
1
1
1
3
August
1.4
0
4
1
0
September
3.1
6
1
1
4
October
4.8
2
7
1
5
November
4.7
5
12
2
3
December
3.8
8
7
0
6
Average
3.6
7.8
3.7
4.4
2.4
2.9
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
12.5
11
12
11
13
13
February
13.6
14
14
14
14
13
March
13.7
13
14
14
16
12
April
14.1
13
17
14
14
May
12.0
9
14
12
13
June
12.1
8
13
10
15
July
9.7
10
11
7
11
August
10.0
10
10
10
10
September
11.3
11
11
12
10
October
12.9
14
11
13
12
November
12.6
12
14
13
13
December
12.6
12
12
14
13
Average
12.3
12.5
11.4
12.7
12.1
12.3
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
284°
248°
296°
321°
270°
February
240°
219°
323°
019°
324°
March
197°
169°
278°
191°
145°
April
170°
185°
163°
184°
May
149°
160°
135°
120°
June
120°
163°
168°
180°
July
178°
173°
164°
151°
August
149°
172°
173°
154°
September
158°
172°
174°
152°
October
189°
190°
192°
152°
November
199°
230°
200°
191°
December
256°
209°
207°
325°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.