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
69.9
66
77
91
78
71
February
83.6
97
96
86
90
66
March
87.9
88
88
94
92
85
April
92.5
93
92
95
93
May
92.4
96
92
91
92
June
92.9
89
98
93
94
July
92.6
93
93
92
90
August
87.4
94
93
94
93
September
92.6
91
94
94
93
October
89.1
91
97
84
84
November
88.1
93
93
91
100
December
83.5
86
75
89
84
Average
87.7
84.1
90.9
92.2
90.2
88.0
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
2.6
3
7
2
3
3
February
7.0
11
11
6
1
5
March
12.0
15
12
14
14
13
April
16.6
19
16
17
16
May
23.0
23
24
21
21
June
27.0
26
28
27
28
July
28.6
28
29
28
30
August
26.2
27
28
29
27
September
25.6
25
24
26
25
October
18.9
19
18
21
18
November
10.2
13
12
9
14
December
6.9
8
6
11
6
Average
15.6
9.2
18.1
17.4
17.5
18.3
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
-5.7
-5
-1
-7
-3
-3
February
-3.3
-2
-1
-4
-7
-2
March
1.2
3
1
2
2
4
April
5.4
5
6
6
5
May
11.7
10
13
9
11
June
16.2
14
16
18
16
July
18.5
18
19
18
19
August
16.1
16
17
19
17
September
14.2
13
14
15
12
October
8.0
8
5
11
7
November
1.2
1
2
0
8
December
-2.8
0
-1
1
-2
Average
5.7
-2.8
7.0
7.1
7.7
8.5
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
0
February
0.0
0
0
0
0
0
March
0.0
0
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
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
4.6
5
5
5
5
4
February
5.0
6
6
6
6
6
March
5.5
7
7
6
7
6
April
4.9
6
7
6
6
May
4.5
5
6
4
5
June
3.6
4
3
4
4
July
2.4
2
3
2
2
August
2.3
3
3
2
2
September
3.1
3
3
3
3
October
3.9
4
5
4
4
November
5.1
5
5
5
6
December
5.4
5
5
6
6
Average
4.4
6.0
4.4
4.6
4.2
4.2
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
181°
191°
202°
105°
157°
February
187°
199°
186°
024°
180°
March
183°
190°
203°
156°
202°
April
172°
166°
214°
247°
May
086°
137°
104°
115°
June
076°
134°
167°
095°
July
215°
031°
063°
072°
August
067°
124°
098°
061°
September
083°
091°
122°
081°
October
188°
166°
155°
115°
November
163°
180°
219°
288°
December
177°
126°
175°
187°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.