Altocumulus Average Cloud Amount (%) October (1954 - 1997) , Ship Observations Only Global Average: 16.7 Zonal Averages 17 zones Lat.N Average 85 17.1 75 13.6 65 15.3 55 15.0 45 15.4 35 16.0 25 12.9 15 14.7 5 20.9 -5 16.3 -15 16.4 -25 17.9 -35 18.2 -45 17.8 -55 18.0 -65 15.5 -75 8.5 Grid Box Averages 367 filled boxes Box # Lat.N Lon.E Average 1 85 60 21.9 2 85 180 15.0 3 85 300 13.5 4 75 20 17.6 5 75 60 13.5 6 75 100 12.5 7 75 140 7.7 8 75 180 14.9 9 75 220 12.7 10 75 260 14.6 11 75 300 16.8 12 75 340 11.7 13 65 10 18.8 14 65 30 14.5 15 65 50 13.1 16 65 70 13.7 20 65 150 7.5 21 65 170 8.6 22 65 190 8.9 23 65 210 9.9 26 65 270 16.6 27 65 290 15.9 28 65 310 14.6 29 65 330 18.4 30 65 350 16.5 31 55 10 17.4 32 55 30 16.3 37 55 130 8.3 38 55 150 10.5 39 55 170 12.8 40 55 190 13.7 41 55 210 13.4 42 55 230 14.3 44 55 270 19.6 45 55 290 23.9 46 55 310 15.6 47 55 330 17.8 48 55 350 17.2 49 45 5 16.1 50 45 15 14.9 51 45 25 13.3 52 45 35 7.0 53 45 45 7.6 54 45 55 8.3 62 45 135 8.3 63 45 145 9.4 64 45 155 12.6 65 45 165 14.1 66 45 175 14.6 67 45 185 15.3 68 45 195 15.9 69 45 205 15.7 70 45 215 17.4 71 45 225 16.9 72 45 235 13.7 77 45 285 13.2 78 45 295 13.7 79 45 305 16.9 80 45 315 17.8 81 45 325 19.3 82 45 335 19.3 83 45 345 17.6 84 45 355 17.2 85 35 5 15.0 86 35 15 12.7 87 35 25 9.3 88 35 35 5.7 90 35 55 5.2 96 35 115 16.4 97 35 125 16.9 98 35 135 18.0 99 35 145 19.1 100 35 155 17.0 101 35 165 17.5 102 35 175 17.0 103 35 185 17.7 104 35 195 17.6 105 35 205 16.8 106 35 215 17.7 107 35 225 15.2 108 35 235 11.1 109 35 245 9.2 112 35 275 14.8 113 35 285 16.2 114 35 295 17.2 115 35 305 17.4 116 35 315 16.5 117 35 325 16.0 118 35 335 17.0 119 35 345 13.6 120 35 355 12.7 124 25 35 3.4 125 25 45 3.7 126 25 55 1.4 127 25 65 1.6 128 25 75 6.7 129 25 85 13.4 130 25 95 12.5 131 25 105 21.1 132 25 115 15.7 133 25 125 15.4 134 25 135 15.1 135 25 145 11.7 136 25 155 11.2 137 25 165 10.5 138 25 175 10.9 139 25 185 12.9 140 25 195 13.2 141 25 205 12.7 142 25 215 14.0 143 25 225 19.0 144 25 235 17.9 145 25 245 9.9 146 25 255 11.3 147 25 265 14.1 148 25 275 15.2 149 25 285 15.4 150 25 295 13.3 151 25 305 12.9 152 25 315 13.2 153 25 325 12.1 154 25 335 11.4 155 25 345 9.8 160 15 35 2.8 161 15 45 3.7 162 15 55 4.7 163 15 65 7.0 164 15 75 16.1 165 15 85 14.1 166 15 95 17.9 167 15 105 21.0 168 15 115 15.6 169 15 125 15.3 170 15 135 16.2 171 15 145 13.7 172 15 155 13.6 173 15 165 13.7 174 15 175 13.9 175 15 185 12.0 176 15 195 15.8 177 15 205 14.5 178 15 215 16.2 179 15 225 19.3 180 15 235 18.8 181 15 245 15.5 182 15 255 16.4 183 15 265 22.0 184 15 275 22.1 185 15 285 15.7 186 15 295 12.6 187 15 305 13.3 188 15 315 15.5 189 15 325 14.9 190 15 335 14.0 191 15 345 12.9 193 5 5 28.1 197 5 45 6.9 198 5 55 7.8 199 5 65 13.7 200 5 75 21.6 201 5 85 26.7 202 5 95 36.2 203 5 105 27.6 204 5 115 26.0 205 5 125 20.3 206 5 135 23.2 207 5 145 21.7 208 5 155 20.9 209 5 165 19.3 210 5 175 17.7 211 5 185 16.7 212 5 195 17.8 213 5 205 17.0 214 5 215 16.5 215 5 225 18.9 216 5 235 19.1 217 5 245 20.4 218 5 255 19.8 219 5 265 27.1 220 5 275 34.6 221 5 285 34.7 223 5 305 14.7 224 5 315 15.5 225 5 325 17.9 226 5 335 23.9 227 5 345 22.2 228 5 355 23.6 229 -5 5 28.9 230 -5 15 25.9 232 -5 35 9.4 233 -5 45 8.2 234 -5 55 13.2 235 -5 65 21.4 236 -5 75 24.7 237 -5 85 30.2 238 -5 95 30.6 239 -5 105 25.1 240 -5 115 15.7 241 -5 125 10.7 242 -5 135 13.2 243 -5 145 27.1 244 -5 155 21.9 245 -5 165 22.7 246 -5 175 19.1 247 -5 185 12.3 248 -5 195 8.8 249 -5 205 5.4 250 -5 215 4.7 251 -5 225 4.2 252 -5 235 7.2 253 -5 245 10.0 254 -5 255 14.6 255 -5 265 19.0 256 -5 275 24.3 257 -5 285 22.8 260 -5 315 8.4 261 -5 325 7.9 262 -5 335 9.7 263 -5 345 16.7 264 -5 355 19.9 265 -15 5 25.6 266 -15 15 32.0 268 -15 35 7.1 269 -15 45 6.8 270 -15 55 14.4 271 -15 65 16.9 272 -15 75 19.6 273 -15 85 20.4 274 -15 95 18.7 275 -15 105 11.6 276 -15 115 5.6 277 -15 125 5.4 278 -15 135 7.3 279 -15 145 10.3 280 -15 155 13.7 281 -15 165 17.6 282 -15 175 22.3 283 -15 185 22.3 284 -15 195 18.5 285 -15 205 16.0 286 -15 215 14.0 287 -15 225 10.1 288 -15 235 12.9 289 -15 245 15.3 290 -15 255 17.9 291 -15 265 20.1 292 -15 275 16.4 293 -15 285 14.2 297 -15 325 15.7 298 -15 335 14.4 299 -15 345 22.1 300 -15 355 24.3 301 -25 5 16.2 302 -25 15 13.9 304 -25 35 12.4 305 -25 45 13.9 306 -25 55 14.2 307 -25 65 17.9 308 -25 75 17.2 309 -25 85 19.4 310 -25 95 18.2 311 -25 105 17.1 312 -25 115 7.7 315 -25 145 7.5 316 -25 155 10.8 317 -25 165 14.0 318 -25 175 19.3 319 -25 185 20.1 320 -25 195 23.3 321 -25 205 18.4 322 -25 215 24.2 323 -25 225 20.9 324 -25 235 19.7 325 -25 245 14.3 326 -25 255 21.3 327 -25 265 14.9 328 -25 275 13.9 329 -25 285 10.2 332 -25 315 27.3 333 -25 325 21.9 334 -25 335 22.0 335 -25 345 22.2 336 -25 355 20.4 337 -35 5 22.1 338 -35 15 14.1 339 -35 25 15.2 340 -35 35 16.4 341 -35 45 17.4 342 -35 55 17.9 343 -35 65 19.1 344 -35 75 16.9 345 -35 85 18.5 346 -35 95 20.1 347 -35 105 19.4 348 -35 115 13.6 349 -35 125 15.6 350 -35 135 16.7 351 -35 145 16.1 352 -35 155 15.8 353 -35 165 17.0 354 -35 175 19.1 355 -35 185 18.9 356 -35 195 19.6 357 -35 205 18.6 358 -35 215 20.3 359 -35 225 16.8 360 -35 235 22.0 361 -35 245 17.1 362 -35 255 21.2 363 -35 265 17.5 364 -35 275 15.5 365 -35 285 11.7 366 -35 295 13.4 367 -35 305 15.2 368 -35 315 17.1 369 -35 325 18.0 370 -35 335 21.0 371 -35 345 22.4 372 -35 355 23.5 373 -45 5 15.2 377 -45 45 16.3 378 -45 55 15.1 379 -45 65 23.4 380 -45 75 19.5 381 -45 85 18.2 382 -45 95 20.9 383 -45 105 20.1 384 -45 115 19.7 385 -45 125 19.1 386 -45 135 16.3 387 -45 145 16.5 388 -45 155 16.5 389 -45 165 17.6 390 -45 175 18.0 391 -45 185 18.9 392 -45 195 20.1 393 -45 205 12.1 394 -45 215 21.3 395 -45 225 14.8 400 -45 275 12.6 401 -45 285 13.6 402 -45 295 16.2 403 -45 305 21.4 404 -45 315 15.8 405 -45 325 24.8 406 -45 335 16.0 407 -45 345 14.0 408 -45 355 18.4 411 -55 50 15.3 413 -55 90 19.4 414 -55 110 23.0 415 -55 130 13.8 416 -55 150 9.9 417 -55 170 22.8 421 -55 250 9.8 422 -55 270 10.4 423 -55 290 20.7 424 -55 310 28.8 425 -55 330 27.4 426 -55 350 15.1 429 -65 50 18.3 430 -65 70 9.6 432 -65 110 10.5 433 -65 130 16.3 442 -65 310 22.6 444 -65 350 13.9 453 -75 340 8.5