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
77.1
74
94
0
91
88
February
81.8
95
97
72
50
94
March
91.2
94
94
89
84
87
April
94.0
94
97
94
97
May
93.2
91
89
91
94
June
97.0
97
97
93
100
July
98.2
95
99
98
99
August
97.2
99
97
97
97
September
94.7
94
96
96
92
October
93.7
90
97
97
88
November
92.2
93
86
99
93
December
88.6
85
70
94
89
Average
91.4
87.6
93.7
84.3
90.7
93.3
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
10.2
7
12
11
9
12
February
12.0
16
13
12
5
12
March
18.6
20
16
18
19
20
April
22.3
22
24
21
22
May
26.3
26
27
24
25
June
31.4
31
32
31
33
July
34.3
34
37
33
33
August
33.2
35
35
33
32
September
30.3
32
30
33
27
October
22.7
23
24
24
22
November
16.4
17
14
17
19
December
12.5
12
12
18
12
Average
21.5
14.1
22.7
23.5
22.1
22.4
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
-2.3
-5
0
-5
0
0
February
0.4
3
1
-2
-2
0
March
5.8
8
4
4
5
8
April
8.9
8
10
7
9
May
15.2
15
16
14
15
June
20.1
19
21
19
21
July
22.2
22
22
21
23
August
21.1
22
22
19
20
September
17.7
16
16
18
16
October
10.4
10
10
11
10
November
4.3
5
3
5
7
December
1.4
2
2
4
-1
Average
9.5
2.2
10.4
10.3
9.8
10.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.1
8
5
2
2
5
February
4.8
6
4
7
6
4
March
3.1
3
1
5
6
6
April
4.0
8
0
3
2
May
5.5
6
11
8
4
June
2.4
3
3
4
1
July
1.9
4
4
2
2
August
3.1
1
3
2
1
September
3.4
3
1
1
3
October
5.1
11
4
1
3
November
3.7
5
8
0
3
December
3.0
2
6
1
6
Average
3.8
5.6
4.3
4.5
2.9
3.2
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
8.1
7
8
8
8
8
February
8.2
9
9
9
5
8
March
9.5
9
9
10
10
9
April
10.1
10
13
9
9
May
8.4
7
10
8
8
June
8.4
6
9
8
10
July
7.1
7
8
7
7
August
7.1
7
7
8
7
September
7.6
8
7
8
6
October
8.1
8
7
8
8
November
8.3
8
8
9
10
December
7.8
8
8
9
8
Average
8.3
8.4
7.9
8.7
8.1
8.1
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
208°
238°
246°
289°
197°
February
216°
224°
240°
017°
257°
March
213°
201°
213°
198°
181°
April
183°
180°
186°
184°
May
160°
164°
136°
134°
June
154°
164°
167°
180°
July
175°
173°
167°
154°
August
157°
173°
176°
154°
September
157°
185°
180°
166°
October
183°
205°
200°
169°
November
194°
186°
197°
197°
December
216°
214°
203°
254°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.