Altocumulus Average Cloud Amount (%) November (1954 - 1997) Night, Ship Observations Only Global Average: 17.2 Zonal Averages 17 zones Lat.N Average 85 13.1 75 9.4 65 11.9 55 11.9 45 13.3 35 16.2 25 13.1 15 13.9 5 20.0 -5 17.3 -15 18.6 -25 19.5 -35 18.3 -45 18.7 -55 22.1 -65 16.3 -75 21.3 Grid Box Averages 326 filled boxes Box # Lat.N Lon.E Average 2 85 180 13.1 4 75 20 13.3 5 75 60 10.5 8 75 180 8.0 9 75 220 5.9 13 65 10 15.6 14 65 30 13.8 15 65 50 10.1 21 65 170 4.7 22 65 190 3.4 27 65 290 14.4 28 65 310 13.0 29 65 330 13.6 30 65 350 13.4 31 55 10 13.1 32 55 30 17.1 38 55 150 7.5 39 55 170 10.1 40 55 190 10.4 41 55 210 11.8 42 55 230 11.6 46 55 310 11.4 47 55 330 15.9 48 55 350 14.5 49 45 5 14.9 50 45 15 16.3 51 45 25 17.2 52 45 35 8.2 62 45 135 7.5 63 45 145 9.6 64 45 155 10.8 65 45 165 10.5 66 45 175 10.9 67 45 185 12.7 68 45 195 13.7 69 45 205 13.2 70 45 215 13.7 71 45 225 13.3 72 45 235 13.9 77 45 285 13.9 78 45 295 14.2 79 45 305 16.3 80 45 315 14.8 81 45 325 16.2 82 45 335 16.4 83 45 345 14.7 84 45 355 15.5 85 35 5 15.3 86 35 15 14.2 87 35 25 12.3 88 35 35 11.6 97 35 125 13.8 98 35 135 15.7 99 35 145 15.2 100 35 155 16.8 101 35 165 17.2 102 35 175 15.5 103 35 185 17.8 104 35 195 18.9 105 35 205 19.8 106 35 215 17.9 107 35 225 15.9 108 35 235 11.2 109 35 245 8.2 112 35 275 13.8 113 35 285 15.9 114 35 295 16.3 115 35 305 16.8 116 35 315 16.3 117 35 325 16.6 118 35 335 18.5 119 35 345 15.8 120 35 355 14.2 124 25 35 4.6 125 25 45 8.8 126 25 55 4.7 127 25 65 3.4 129 25 85 13.3 132 25 115 17.6 133 25 125 17.6 134 25 135 15.1 135 25 145 12.6 136 25 155 12.0 137 25 165 9.9 138 25 175 12.3 139 25 185 14.0 140 25 195 13.5 141 25 205 12.0 142 25 215 13.4 143 25 225 18.0 144 25 235 16.6 145 25 245 11.3 146 25 255 10.2 147 25 265 14.9 148 25 275 15.3 149 25 285 13.2 150 25 295 12.3 151 25 305 13.8 152 25 315 13.2 153 25 325 14.2 154 25 335 10.9 155 25 345 9.7 160 15 35 5.2 161 15 45 4.3 162 15 55 6.2 163 15 65 6.7 164 15 75 11.9 165 15 85 14.6 166 15 95 14.2 167 15 105 17.9 168 15 115 14.7 169 15 125 13.3 170 15 135 10.9 171 15 145 11.4 172 15 155 10.4 173 15 165 8.4 174 15 175 13.0 175 15 185 14.3 176 15 195 15.3 177 15 205 14.4 178 15 215 17.3 179 15 225 24.7 180 15 235 23.7 181 15 245 15.8 182 15 255 10.3 183 15 265 12.0 184 15 275 18.3 185 15 285 12.9 186 15 295 10.3 187 15 305 12.0 188 15 315 16.8 189 15 325 18.6 190 15 335 15.4 191 15 345 11.4 193 5 5 25.1 197 5 45 9.2 198 5 55 10.5 199 5 65 13.8 200 5 75 20.5 201 5 85 25.3 202 5 95 34.3 203 5 105 27.4 204 5 115 21.0 205 5 125 19.1 206 5 135 19.4 207 5 145 16.4 208 5 155 18.4 209 5 165 19.8 210 5 175 19.8 211 5 185 22.5 212 5 195 17.5 213 5 205 20.8 214 5 215 19.4 215 5 225 21.0 216 5 235 18.2 217 5 245 20.8 218 5 255 16.7 219 5 265 21.7 220 5 275 29.9 221 5 285 25.4 223 5 305 15.8 224 5 315 16.4 225 5 325 18.2 226 5 335 20.9 227 5 345 18.3 228 5 355 19.2 229 -5 5 32.6 230 -5 15 12.8 233 -5 45 8.7 234 -5 55 13.8 235 -5 65 18.6 236 -5 75 21.4 237 -5 85 25.9 238 -5 95 31.0 239 -5 105 25.9 240 -5 115 22.3 241 -5 125 16.2 242 -5 135 16.8 243 -5 145 23.9 244 -5 155 21.0 245 -5 165 22.4 246 -5 175 20.9 247 -5 185 21.0 248 -5 195 11.1 249 -5 205 6.1 250 -5 215 7.8 251 -5 225 7.9 252 -5 235 4.2 253 -5 245 11.0 254 -5 255 13.5 255 -5 265 20.7 256 -5 275 26.4 260 -5 315 8.2 261 -5 325 8.3 262 -5 335 11.7 263 -5 345 16.6 264 -5 355 22.8 265 -15 5 27.1 266 -15 15 23.4 268 -15 35 12.5 269 -15 45 8.3 270 -15 55 12.8 271 -15 65 14.4 272 -15 75 19.6 273 -15 85 22.4 274 -15 95 22.2 275 -15 105 13.0 276 -15 115 7.6 277 -15 125 8.5 278 -15 135 9.1 279 -15 145 12.9 280 -15 155 11.6 281 -15 165 18.0 282 -15 175 21.5 283 -15 185 21.9 284 -15 195 23.9 285 -15 205 19.5 286 -15 215 16.4 287 -15 225 10.6 288 -15 235 12.0 289 -15 245 17.2 290 -15 255 22.2 291 -15 265 27.9 292 -15 275 25.9 293 -15 285 14.4 297 -15 325 18.0 298 -15 335 20.5 299 -15 345 30.6 300 -15 355 29.8 301 -25 5 18.6 302 -25 15 13.2 304 -25 35 15.0 305 -25 45 13.6 306 -25 55 14.7 307 -25 65 14.2 308 -25 75 18.5 309 -25 85 21.2 310 -25 95 22.3 311 -25 105 18.4 312 -25 115 9.2 316 -25 155 11.6 317 -25 165 16.8 318 -25 175 23.1 319 -25 185 24.2 320 -25 195 21.7 321 -25 205 21.1 322 -25 215 27.5 323 -25 225 19.3 324 -25 235 18.5 325 -25 245 19.9 327 -25 265 21.7 328 -25 275 21.6 329 -25 285 13.8 332 -25 315 24.9 333 -25 325 22.9 334 -25 335 15.3 335 -25 345 21.9 336 -25 355 28.8 337 -35 5 20.5 338 -35 15 11.8 339 -35 25 14.7 340 -35 35 17.9 341 -35 45 15.7 342 -35 55 18.0 343 -35 65 18.0 344 -35 75 21.5 345 -35 85 22.0 346 -35 95 21.4 347 -35 105 17.2 348 -35 115 13.1 349 -35 125 18.9 350 -35 135 14.4 351 -35 145 15.8 352 -35 155 15.1 353 -35 165 19.8 354 -35 175 18.9 355 -35 185 22.1 356 -35 195 21.1 357 -35 205 19.9 358 -35 215 18.6 359 -35 225 15.5 364 -35 275 15.0 365 -35 285 11.3 367 -35 305 15.8 368 -35 315 16.3 369 -35 325 24.2 370 -35 335 16.6 371 -35 345 20.6 372 -35 355 24.5 379 -45 65 25.2 380 -45 75 24.0 383 -45 105 21.4 384 -45 115 21.4 387 -45 145 14.5 388 -45 155 18.3 389 -45 165 22.6 390 -45 175 21.3 391 -45 185 16.8 392 -45 195 13.3 393 -45 205 14.9 400 -45 275 9.1 401 -45 285 16.5 402 -45 295 12.0 403 -45 305 16.6 405 -45 325 28.1 410 -55 30 27.5 411 -55 50 17.5 412 -55 70 18.4 413 -55 90 15.6 414 -55 110 23.3 415 -55 130 20.6 416 -55 150 18.5 417 -55 170 19.2 422 -55 270 27.4 423 -55 290 21.6 424 -55 310 27.0 425 -55 330 28.5 429 -65 50 19.7 430 -65 70 13.4 432 -65 110 14.5 433 -65 130 12.9 434 -65 150 23.0 435 -65 170 8.0 441 -65 290 13.1 442 -65 310 25.2 449 -75 180 21.3