The precipitation return levels presented in the tables can be used for risk assessment of abundant precipitation and the use of design rainfall. The values have been calculated for those weather stations of the Finnish Meteorological Institute from which long (typically over 50 years) and reliable time series can be obtained. When applied to other locations, one should select the weather station which is climatically closest, which, in practice, usually is the nearest station. The calculated values are based on observations which means that the predicted impacts of climate change are not included.
Return levels for precipitation of six hours at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.
Precipitation return levels in Finland, 6 hours
ret.period
1201 Jokioinen observatory
7501 Sodankylä
years
95%
avg.
95%
95%
avg.
95%
10
31
44
56
21
26
33
20
38
54
69
23
29
37
50
50
71
92
25
33
42
100
60
86
112
26
36
47
500
-
-
-
30
43
57
Return levels for precipitation of 24 hours at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.
Precipitation return levels in Finland, 24 hours
ret.period
304 Helsinki Kaisaniemi
1101 Turku airport
1201 Jokioinen observatory
1501 Utti airport
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
47
55
66
47
55
64
48
57
67
42
48
56
20
52
64
76
53
64
75
54
67
80
46
54
63
50
60
76
92
62
76
91
65
82
98
51
63
74
100
68
86
105
71
87
104
75
95
115
56
70
83
500
89
115
141
94
118
142
104
133
162
70
88
105
ret.period
2401 Jyväskylä airport
3201 Kauhava airport
3801 Joensuu airport
5401 Oulu airport
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
46
54
64
44
51
61
45
52
61
38
45
54
20
52
63
75
49
60
72
50
60
72
42
53
63
50
61
76
92
56
71
88
59
73
88
50
64
77
100
69
88
106
66
84
101
67
84
101
57
73
89
500
-
-
-
88
114
139
90
115
140
-
-
-
ret.period
6801 Kuusamo airport
7501 Sodankylä
8201 Muonio kk
9601 Ivalo
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
37
43
51
35
39
45
43
51
61
43
53
64
20
41
50
60
38
43
50
49
60
72
50
64
78
50
48
60
73
42
49
57
57
72
87
63
82
100
100
54
69
-
44
54
63
65
83
100
75
98
121
500
-
-
-
53
65
76
86
111
136
-
-
-
Return levels for precipitation of five days at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.
Precipitation return levels in Finland, 5 days
ret.period
304 Helsinki Kaisaniemi
1101 Turku airport
1201 Jokioinen observatory
1501 Utti airport
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
75
85
100
72
80
91
70
79
65
74
76
83
20
85
97
126
80
90
111
78
90
124
79
82
92
50
96
112
160
89
102
142
89
106
154
84
87
105
100
103
122
179
95
110
157
96
119
-
87
90
116
500
116
144
219
105
125
186
110
-
-
91
95
127
ret.period
2401 Jyväskylä airport
3201 Kauhava airport
3801 Joensuu airport
5401 Oulu airport
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
72
76
83
-
-
-
72
82
96
53
58
66
20
77
82
94
-
-
-
82
94
119
58
64
78
50
83
90
113
-
-
-
93
107
156
64
71
98
100
87
94
124
-
-
-
100
116
172
67
75
106
500
93
101
137
-
-
-
111
133
-
71
82
121
ret.period
6801 Kuusamo airport
7501 Sodankylä
8201 Muonio kk
9601 Ivalo
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
-
-
-
57
63
72
60
67
78
62
72
89
20
-
-
-
63
71
89
66
75
97
71
83
117
50
-
-
-
71
82
111
74
86
120
82
97
148
100
-
-
-
77
91
126
80
94
134
88
107
166
500
-
-
-
87
109
-
90
112
165
98
128
205
Return levels for precipitation of 24 hours at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.
Precipitation return levels in Finland, 14 days
ret.period
304 Helsinki Kaisaniemi
1101 Turku airport
1201 Jokioinen observatory
1501 Utti airport
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
119
126
137
116
127
143
115
119
129
111
116
126
20
126
135
161
127
141
171
123
128
141
118
124
140
50
134
144
-
140
156
-
130
135
157
125
131
161
100
138
149
-
148
166
-
134
139
169
128
135
179
500
144
156
-
159
184
-
139
145
190
133
142
190
ret.period
2401 Jyväskylä airport
3201 Kauhava airport
3801 Joensuu airport
5401 Oulu airport
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
104
112
123
-
-
-
-
122
134
83
88
96
20
112
122
142
-
-
-
-
130
144
88
94
106
50
121
133
169
-
-
-
-
137
161
94
101
121
100
127
141
183
-
-
-
-
140
174
97
105
133
500
138
157
210
-
-
-
-
144
198
102
112
145
ret.period
6801 Kuusamo airport
7501 Sodankylä
8201 Muonio kk
9601 Ivalo
years
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
95%
avg.
95%
10
98
101
109
89
94
101
91
101
118
87
99
120
20
104
107
121
94
100
112
100
113
-
98
113
-
50
108
113
141
99
107
131
112
130
-
111
131
-
100
111
115
151
101
110
141
119
142
-
119
144
-
500
114
119
158
106
116
151
132
-
-
133
-
-
Return levels for precipitation of a month at weather stations in different parts of Finland. With the help of the table it is possible to examine precipitation (in millimetres) which has a frequency (return period) of either 10, 20, 50, 100 or 500 years. The table shows the best estimate (average - avg.) and the limits within which 95% of cases occur. Empty cell means that the method used was not applicable for estimating the return levels in question.
Venäläinen, A., Saku, S., Kilpeläinen, T., Jylhä, K., Tuomenvirta, H., Vajda, A., Räisänen, J. & Ruosteenoja, K. 2007. Sään ääri-ilmiöistä Suomessa. Ilmatieteen laitos, Helsinki. Ilmatieteen laitoksen raportteja 2007:4. 81 s.
http://hdl.handle.net/10138/1138