Why do weather forecasters report that Shanghai has entered spring, summer, autumn and winter, and some years and temperatures are not very correct?

According to the historical data 1994 65438+ 10/~ 5, although the average daily temperature for five consecutive days was less than 22℃, Shanghai adopted the "five-day sliding" method, which means that it is ok to keep the average temperature below 22℃ for five consecutive days, so it can be found until June 65438. However, from 10 to 17, it meets the requirements, so the first day when the temperature is lower than 22℃ 10 to 17 is designated as autumn.

v 0 1000v 0400 1v 04002v 04003v 1200 1

Annual, monthly and daily average temperature of the station

58362 1994 9 1 283

58362 1994 9 2 286

58362 1994 9 3 282

58362 1994 9 4 303

58362 1994 9 5 263

58362 1994 9 6 234

58362 1994 9 7 270

58362 1994 9 8 277

58362 1994 9 9 276

58362 1994 9 10 263

58362 1994 9 1 1 244

58362 1994 9 12 197

58362 1994 9 13 222

58362 1994 9 14 234

58362 1994 9 15 235

58362 1994 9 16 236

58362 1994 9 17 222

58362 1994 9 18 2 16

58362 1994 9 19 227

58362 1994 9 20 235

58362 1994 9 2 1 232

58362 1994 9 22 230

58362 1994 9 23 2 18

58362 1994 9 24 222

58362 1994 9 25 2 17

58362 1994 9 26 2 15

58362 1994 9 27 22 1

58362 1994 9 28 225

58362 1994 9 29 227

58362 1994 9 30 2 12

58362 1994 10 1 2 1 1

58362 1994 10 2 2 1 1

58362 1994 10 3 22 1

58362 1994 10 4 197

58362 1994 10 5 192

58362 1994 10 6 204

58362 1994 10 7 200

58362 1994 10 8 2 15

58362 1994 10 9 226

58362 1994 10 10 2 14

58362 1994 10 1 1 2 12

58362 1994 10 12 206

58362 1994 10 13 2 17

58362 1994 10 14 223

58362 1994 10 15 238

58362 1994 10 16 24 1

58362 1994 10 17 189

58362 1994 10 18 187

58362 1994 10 19 153

58362 1994 10 20 134

58362 1994 10 2 1 1 13

58362 1994 10 22 139

58362 1994 10 23 164

58362 1994 10 24 173

58362 1994 10 25 182

58362 1994 10 26 179

58362 1994 10 27 176

58362 1994 10 28 176

58362 1994 10 29 15 1

58362 1994 10 30 156

58362 1994 10 3 1 163

58362 1994 1 1 1 16 1