1.雨季开始日期计算，实验一

（1）X在4月21日之后开始计算；

（2）X之后连续20天内，每5天滑动的累积降水量>=12mm的情况要出现2次或2次以上

（3）X之后首次5天滑动累积降水量>=12mm内的5天内，日降水量首次≥10（如果没有大于等于10，则选择降水量最大的一天）的日期为雨季开始日。

2.雨季开始日期计算，实验二

（1）X在4月21日之后开始计算；

（2）X之后5天滑动累积降水量>=12mm的5天中，日降水量首次大于日降水量首次≥10（如果没有大于等于10，则选择降水量最大的一天）的日期为雨季开始待定日；

（3）在之后的15天又出现5天滑动累积降水量>=12mm的情况，即将雨季开始待定日确定为雨季开始日，雨季开始日所在的侯为雨季开始侯；

（4）如果之后的15天内再未出现5天滑动累积降水量>=12mm的情况，则重复步骤（2）（3）（4）；

（5）如果得到的雨季开始日期是4月21日，则逐日向前按步骤（2）（3）（4）推算符合雨季开始日标准的日期。

数据：

xh,time,rain
0,1993-01-01,0.0
1,1993-01-02,0.0
2,1993-01-03,0.0
3,1993-01-04,0.0
4,1993-01-05,0.0
5,1993-01-06,0.0
6,1993-01-07,0.0
7,1993-01-08,0.0
8,1993-01-09,0.0
9,1993-01-10,0.0
10,1993-01-11,0.0
11,1993-01-12,0.0
12,1993-01-13,0.0
13,1993-01-14,0.0
14,1993-01-15,0.0
15,1993-01-16,0.0
16,1993-01-17,0.0
17,1993-01-18,0.0
18,1993-01-19,0.0
19,1993-01-20,0.0
20,1993-01-21,0.0
21,1993-01-22,0.0
22,1993-01-23,0.0
23,1993-01-24,0.0
24,1993-01-25,0.0
25,1993-01-26,0.0
26,1993-01-27,0.0
27,1993-01-28,0.0
28,1993-01-29,0.0
29,1993-01-30,0.0
30,1993-01-31,0.0
31,1993-02-01,0.0
32,1993-02-02,0.0
33,1993-02-03,0.0
34,1993-02-04,0.0
35,1993-02-05,0.0
36,1993-02-06,0.0
37,1993-02-07,0.0
38,1993-02-08,0.0
39,1993-02-09,0.0
40,1993-02-10,0.0
41,1993-02-11,0.0
42,1993-02-12,0.0
43,1993-02-13,0.0
44,1993-02-14,0.0
45,1993-02-15,0.0
46,1993-02-16,0.0
47,1993-02-17,0.0
48,1993-02-18,0.0
49,1993-02-19,0.0
50,1993-02-20,0.0
51,1993-02-21,0.0
52,1993-02-22,0.0
53,1993-02-23,0.0
54,1993-02-24,0.0
55,1993-02-25,0.0
56,1993-02-26,0.0
57,1993-02-27,0.0
58,1993-02-28,0.0
59,1993-03-01,0.0
60,1993-03-02,0.0
61,1993-03-03,0.0
62,1993-03-04,0.0
63,1993-03-05,0.0
64,1993-03-06,0.0
65,1993-03-07,0.0
66,1993-03-08,0.0
67,1993-03-09,0.0
68,1993-03-10,0.0
69,1993-03-11,0.0
70,1993-03-12,0.0
71,1993-03-13,0.0
72,1993-03-14,0.0
73,1993-03-15,0.0
74,1993-03-16,0.0
75,1993-03-17,0.0
76,1993-03-18,0.0
77,1993-03-19,0.0
78,1993-03-20,0.0
79,1993-03-21,0.0
80,1993-03-22,0.0
81,1993-03-23,0.0
82,1993-03-24,0.0
83,1993-03-25,0.0
84,1993-03-26,0.0
85,1993-03-27,0.0
86,1993-03-28,0.0
87,1993-03-29,0.0
88,1993-03-30,0.0
89,1993-03-31,0.0
90,1993-04-01,0.0
91,1993-04-02,0.0
92,1993-04-03,0.0
93,1993-04-04,0.0
94,1993-04-05,0.0
95,1993-04-06,0.0
96,1993-04-07,0.0
97,1993-04-08,0.0
98,1993-04-09,0.0
99,1993-04-10,0.0
100,1993-04-11,0.0
101,1993-04-12,0.0
102,1993-04-13,0.0
103,1993-04-14,0.0
104,1993-04-15,0.0
105,1993-04-16,0.0
106,1993-04-17,0.0
107,1993-04-18,0.0
108,1993-04-19,0.0
109,1993-04-20,0.0
110,1993-04-21,0.0
111,1993-04-22,0.0
112,1993-04-23,0.0
113,1993-04-24,0.0
114,1993-04-25,0.0
115,1993-04-26,12.0
116,1993-04-27,0.0
117,1993-04-28,0.0
118,1993-04-29,0.0
119,1993-04-30,0.0
120,1993-05-01,0.0
121,1993-05-02,0.0
122,1993-05-03,0.0
123,1993-05-04,0.0
124,1993-05-05,0.0
125,1993-05-06,0.0
126,1993-05-07,0.0
127,1993-05-08,0.0
128,1993-05-09,0.0
129,1993-05-10,0.0
130,1993-05-11,0.0
131,1993-05-12,0.0
132,1993-05-13,0.0
133,1993-05-14,0.0
134,1993-05-15,0.0
135,1993-05-16,0.0
136,1993-05-17,11.4
137,1993-05-18,0.0
138,1993-05-19,0.0
139,1993-05-20,0.0
140,1993-05-21,6.9
141,1993-05-22,0.0
142,1993-05-23,23.4
143,1993-05-24,0.0
144,1993-05-25,0.0
145,1993-05-26,0.0
146,1993-05-27,0.0
147,1993-05-28,0.0
148,1993-05-29,0.0
149,1993-05-30,0.0
150,1993-05-31,0.0
151,1993-06-01,0.0
152,1993-06-02,0.0
153,1993-06-03,0.0
154,1993-06-04,0.0
155,1993-06-05,0.0
156,1993-06-06,0.0
157,1993-06-07,0.0
158,1993-06-08,0.0
159,1993-06-09,0.0
160,1993-06-10,0.0
161,1993-06-11,7.7
162,1993-06-12,26.2
163,1993-06-13,0.0
164,1993-06-14,63.5
165,1993-06-15,0.0
166,1993-06-16,7.7
167,1993-06-17,27.6
168,1993-06-18,0.0
169,1993-06-19,0.0
170,1993-06-20,0.0
171,1993-06-21,28.6
172,1993-06-22,0.0
173,1993-06-23,50.5
174,1993-06-24,0.0
175,1993-06-25,0.0
176,1993-06-26,0.0
177,1993-06-27,0.0
178,1993-06-28,0.0
179,1993-06-29,0.0
180,1993-06-30,0.0
181,1993-07-01,0.0
182,1993-07-02,7.3
183,1993-07-03,35.4
184,1993-07-04,19.0
185,1993-07-05,0.0
186,1993-07-06,0.0
187,1993-07-07,0.0
188,1993-07-08,0.0
189,1993-07-09,74.0
190,1993-07-10,0.0
191,1993-07-11,0.8
192,1993-07-12,5.3
193,1993-07-13,0.0
194,1993-07-14,0.0
195,1993-07-15,0.0
196,1993-07-16,0.0
197,1993-07-17,3.8
198,1993-07-18,13.4
199,1993-07-19,2.8
200,1993-07-20,36.3
201,1993-07-21,0.0
202,1993-07-22,53.0
203,1993-07-23,36.9
204,1993-07-24,11.0
205,1993-07-25,0.0
206,1993-07-26,8.7
207,1993-07-27,0.0
208,1993-07-28,78.7
209,1993-07-29,0.0
210,1993-07-30,4.0
211,1993-07-31,0.0
212,1993-08-01,10.6
213,1993-08-02,0.0
214,1993-08-03,0.0
215,1993-08-04,10.7
216,1993-08-05,0.0
217,1993-08-06,0.0
218,1993-08-07,0.0
219,1993-08-08,0.0
220,1993-08-09,0.0
221,1993-08-10,45.0
222,1993-08-11,0.0
223,1993-08-12,0.0
224,1993-08-13,0.0
225,1993-08-14,0.0
226,1993-08-15,12.2
227,1993-08-16,0.0
228,1993-08-17,0.0
229,1993-08-18,0.0
230,1993-08-19,126.0
231,1993-08-20,0.0
232,1993-08-21,0.0
233,1993-08-22,0.0
234,1993-08-23,0.0
235,1993-08-24,0.0
236,1993-08-25,0.0
237,1993-08-26,0.0
238,1993-08-27,0.0
239,1993-08-28,0.0
240,1993-08-29,42.3
241,1993-08-30,0.0
242,1993-08-31,38.0
243,1993-09-01,0.0
244,1993-09-02,0.0
245,1993-09-03,0.0
246,1993-09-04,16.9
247,1993-09-05,0.0
248,1993-09-06,40.0
249,1993-09-07,6.0
250,1993-09-08,0.0
251,1993-09-09,39.5
252,1993-09-10,12.0
253,1993-09-11,0.0
254,1993-09-12,70.0
255,1993-09-13,11.0
256,1993-09-14,62.0
257,1993-09-15,0.0
258,1993-09-16,54.0
259,1993-09-17,43.0
260,1993-09-18,0.0
261,1993-09-19,0.0
262,1993-09-20,14.0
263,1993-09-21,43.3
264,1993-09-22,0.0
265,1993-09-23,33.3
266,1993-09-24,32.0
267,1993-09-25,0.0
268,1993-09-26,0.0
269,1993-09-27,0.0
270,1993-09-28,0.0
271,1993-09-29,60.0
272,1993-09-30,12.6
273,1993-10-01,0.0
274,1993-10-02,0.0
275,1993-10-03,0.0
276,1993-10-04,5.2
277,1993-10-05,0.0
278,1993-10-06,3.6
279,1993-10-07,0.0
280,1993-10-08,0.0
281,1993-10-09,0.0
282,1993-10-10,0.0
283,1993-10-11,0.0
284,1993-10-12,0.0
285,1993-10-13,0.0
286,1993-10-14,0.0
287,1993-10-15,0.0
288,1993-10-16,0.0
289,1993-10-17,0.0
290,1993-10-18,4.7
291,1993-10-19,0.0
292,1993-10-20,0.0
293,1993-10-21,0.0
294,1993-10-22,0.0
295,1993-10-23,0.0
296,1993-10-24,0.0
297,1993-10-25,0.0
298,1993-10-26,0.0
299,1993-10-27,0.0
300,1993-10-28,0.0
301,1993-10-29,0.0
302,1993-10-30,0.0
303,1993-10-31,0.0
304,1993-11-01,0.0
305,1993-11-02,0.0
306,1993-11-03,0.0
307,1993-11-04,0.0
308,1993-11-05,0.0
309,1993-11-06,0.0
310,1993-11-07,0.0
311,1993-11-08,0.0
312,1993-11-09,0.0
313,1993-11-10,0.0
314,1993-11-11,0.0
315,1993-11-12,0.0
316,1993-11-13,0.0
317,1993-11-14,0.0
318,1993-11-15,0.0
319,1993-11-16,0.0
320,1993-11-17,0.0
321,1993-11-18,0.0
322,1993-11-19,0.0
323,1993-11-20,0.0
324,1993-11-21,0.0
325,1993-11-22,0.0
326,1993-11-23,0.0
327,1993-11-24,0.0
328,1993-11-25,0.0
329,1993-11-26,0.0
330,1993-11-27,0.0
331,1993-11-28,0.0
332,1993-11-29,0.0
333,1993-11-30,0.0
334,1993-12-01,0.0
335,1993-12-02,0.0
336,1993-12-03,0.0
337,1993-12-04,0.0
338,1993-12-05,0.0
339,1993-12-06,0.0
340,1993-12-07,0.0
341,1993-12-08,0.0
342,1993-12-09,0.0
343,1993-12-10,0.0
344,1993-12-11,0.0
345,1993-12-12,0.0
346,1993-12-13,0.0
347,1993-12-14,0.0
348,1993-12-15,0.0
349,1993-12-16,0.0
350,1993-12-17,0.0
351,1993-12-18,0.0
352,1993-12-19,0.0
353,1993-12-20,0.0
354,1993-12-21,0.0
355,1993-12-22,0.0
356,1993-12-23,0.0
357,1993-12-24,0.0
358,1993-12-25,0.0
359,1993-12-26,0.0
360,1993-12-27,0.0
361,1993-12-28,0.0
362,1993-12-29,0.0
363,1993-12-30,0.0
364,1993-12-31,0.0
代码部分

X在4月21开始

cond_1 = (bs[‘time’]>= ‘1993-04-21’)