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
92.8
88
90
97
91
94
February
92.1
100
93
97
75
89
March
93.9
94
95
99
98
85
April
95.1
91
99
92
93
May
97.7
97
100
95
100
June
98.6
99
97
98
100
July
99.5
100
99
100
100
August
98.2
96
97
98
100
September
95.7
94
100
100
97
October
93.8
92
98
97
94
November
89.8
83
89
93
94
December
91.7
90
80
100
98
Average
94.9
93.5
93.3
96.5
95.2
95.4
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
15.1
13
16
15
14
17
February
17.9
20
17
15
13
17
March
22.9
22
22
22
23
24
April
27.3
27
29
24
27
May
31.7
30
34
29
34
June
35.4
37
36
33
35
July
35.8
37
37
32
37
August
35.2
37
33
33
37
September
31.6
34
31
33
30
October
25.9
26
25
28
27
November
19.9
18
16
21
22
December
16.8
16
17
22
16
Average
25.4
18.0
26.5
26.2
25.3
26.9
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
0.7
-1
2
-1
1
3
February
2.5
5
2
-2
-2
3
March
7.9
8
7
4
7
11
April
11.5
10
13
10
12
May
17.2
17
19
16
17
June
21.5
22
22
21
21
July
22.8
24
24
20
24
August
22.5
24
21
21
23
September
18.9
20
18
18
16
October
12.0
13
12
12
10
November
6.1
8
5
6
8
December
2.8
3
5
6
1
Average
11.2
4.0
12.7
12.0
11.3
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.2
1
2
0
2
2
February
1.9
0
2
2
5
5
March
0.8
1
0
0
0
4
April
1.1
0
0
3
1
May
0.6
1
0
1
1
June
0.5
0
0
2
0
July
0.5
0
1
2
0
August
0.8
0
1
1
1
September
2.3
2
1
0
1
October
2.3
5
5
1
0
November
2.1
6
4
0
0
December
1.8
1
1
0
2
Average
1.2
0.6
1.5
1.1
1.2
1.2
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
10.1
9
11
10
10
11
February
11.0
12
12
10
10
11
March
11.8
11
12
12
14
11
April
12.2
12
13
12
11
May
12.0
11
13
13
11
June
10.8
10
12
10
12
July
9.6
11
10
8
10
August
9.2
9
9
10
10
September
9.1
8
9
9
8
October
10.0
10
9
10
11
November
10.1
9
11
10
11
December
9.9
10
10
11
11
Average
10.5
10.8
10.4
10.6
10.4
10.5
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
243°
248°
274°
324°
231°
February
254°
233°
061°
045°
234°
March
238°
211°
242°
197°
224°
April
224°
198°
148°
213°
May
146°
194°
137°
162°
June
187°
151°
147°
165°
July
155°
153°
136°
155°
August
141°
130°
155°
156°
September
151°
158°
150°
095°
October
148°
171°
205°
161°
November
202°
196°
186°
174°
December
228°
214°
240°
275°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.