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
95.1
86
100
100
96
February
96.4
96
94
99
96
100
March
98.0
98
94
99
98
100
April
99.7
99
99
100
100
May
99.6
100
99
100
100
June
99.7
100
99
100
100
July
99.9
100
100
100
100
August
99.7
100
100
100
100
September
99.8
100
99
100
100
October
99.8
99
100
100
100
November
99.6
100
99
100
100
December
97.3
100
98
99
95
Average
98.6
97.3
97.7
99.3
99.3
99.2
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
4.3
4
6
4
4
February
7.0
9
5
7
7
8
March
12.3
13
8
13
12
13
April
18.5
17
19
20
18
May
23.2
23
25
24
26
June
30.0
27
31
32
30
July
32.8
36
32
33
32
August
31.3
31
30
31
33
September
27.0
26
28
27
27
October
18.7
21
18
18
22
November
11.5
14
8
13
12
December
4.9
7
4
6
4
Average
17.9
11.0
19.5
18.9
19.5
19.0
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
-6.9
-3
-6
-7
-6
February
-4.1
-3
-6
-5
-3
-5
March
-1.8
0
-2
-1
-1
1
April
3.1
2
3
3
3
May
7.6
8
8
8
9
June
13.0
11
14
15
13
July
16.8
19
18
15
16
August
15.4
16
17
13
17
September
12.0
11
14
13
11
October
4.4
5
5
5
5
November
-1.0
1
-4
1
0
December
-5.4
6
-5
-3
-7
Average
4.3
-2.7
6.0
5.3
5.3
4.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
February
0.6
7
0
0
0
0
March
0.5
4
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
1
0
0
0
September
0.0
1
0
0
0
October
0.0
1
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
0.6
5.2
0.1
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
4.2
5
5
5
3
February
6.0
6
6
6
6
5
March
7.4
9
8
8
8
7
April
8.5
9
10
9
8
May
8.3
8
11
9
8
June
7.8
8
9
7
9
July
5.7
7
6
6
6
August
5.8
7
6
6
6
September
6.5
7
6
6
6
October
6.1
6
6
6
6
November
5.4
3
7
5
6
December
4.1
3
5
6
4
Average
6.6
7.4
7.1
7.3
6.8
6.2
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
174°
254°
218°
283°
February
205°
217°
211°
258°
262°
March
187°
197°
240°
208°
188°
April
233°
230°
221°
240°
May
186°
223°
220°
212°
June
200°
201°
212°
185°
July
218°
181°
208°
229°
August
175°
201°
203°
212°
September
172°
193°
216°
248°
October
187°
220°
213°
215°
November
153°
192°
226°
193°
December
153°
202°
196°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.