Base temperature 15.5°C
| Region | Jan. | Feb. | Mar. | Apr. | May | Jun. | Jul. | Aug. | Sep. | Oct. | Nov. | Dec. | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thames Valley | 346 | 304 | 282 | 197 | 113 | 47 | 24 | 27 | 56 | 132 | 256 | 333 | 2118 |
| South Eastern | 370 | 329 | 310 | 224 | 145 | 74 | 44 | 48 | 84 | 163 | 280 | 366 | 2427 |
| Southern | 339 | 307 | 294 | 214 | 141 | 68 | 41 | 42 | 76 | 145 | 258 | 328 | 2253 |
| South Western | 293 | 272 | 267 | 197 | 131 | 58 | 32 | 30 | 55 | 114 | 215 | 276 | 1940 |
| Severn Valley | 344 | 311 | 292 | 209 | 129 | 56 | 31 | 34 | 69 | 143 | 259 | 328 | 2205 |
| Midland | 371 | 335 | 318 | 233 | 152 | 70 | 41 | 51 | 92 | 172 | 290 | 368 | 2494 |
| West Pennines | 359 | 323 | 304 | 222 | 139 | 66 | 41 | 49 | 79 | 155 | 280 | 346 | 2367 |
| North Western | 366 | 333 | 319 | 239 | 163 | 82 | 55 | 56 | 94 | 169 | 296 | 357 | 2531 |
| Borders | 376 | 343 | 322 | 259 | 193 | 103 | 72 | 72 | 108 | 184 | 300 | 361 | 2693 |
| North Eastern | 374 | 334 | 317 | 234 | 154 | 76 | 48 | 50 | 87 | 171 | 295 | 360 | 2500 |
| East Pennines | 362 | 323 | 304 | 217 | 139 | 66 | 42 | 77 | 157 | 281 | 350 | 358 | 2476 |
| East Anglia | 378 | 334 | 315 | 232 | 143 | 71 | 46 | 43 | 74 | 154 | 283 | 360 | 2433 |
| West Scotland | 368 | 335 | 316 | 235 | 163 | 83 | 61 | 63 | 106 | 179 | 303 | 354 | 2566 |
| East Scotland | 379 | 343 | 326 | 252 | 189 | 100 | 69 | 71 | 106 | 185 | 308 | 368 | 2696 |
| North East Scotland | 396 | 359 | 345 | 270 | 206 | 111 | 85 | 86 | 124 | 199 | 322 | 381 | 2884 |
| Wales | 323 | 301 | 292 | 228 | 156 | 80 | 49 | 43 | 72 | 136 | 239 | 301 | 2220 |
| Northern Ireland | 359 | 325 | 311 | 237 | 167 | 86 | 61 | 63 | 100 | 170 | 288 | 343 | 2510 |