Altocumulus Average Cloud Amount (%) October (1954 - 1997) Day, Ship Observations Only Global Average: 17.0 Zonal Averages 16 zones Lat.N Average 85 17.3 75 15.5 65 17.5 55 16.1 45 16.4 35 16.8 25 13.2 15 15.5 5 21.2 -5 16.5 -15 15.8 -25 17.2 -35 18.2 -45 18.8 -55 19.0 -65 14.0 Grid Box Averages 350 filled boxes Box # Lat.N Lon.E Average 1 85 60 21.2 2 85 180 16.0 3 85 300 13.8 4 75 20 19.9 5 75 60 16.4 6 75 100 15.5 7 75 140 12.8 8 75 180 14.7 9 75 220 13.9 10 75 260 14.6 11 75 300 18.4 12 75 340 13.5 13 65 10 21.7 14 65 30 18.0 15 65 50 14.9 20 65 150 8.4 21 65 170 10.3 22 65 190 10.8 23 65 210 9.3 26 65 270 17.4 27 65 290 19.1 28 65 310 16.9 29 65 330 19.8 30 65 350 18.9 31 55 10 19.2 32 55 30 18.7 37 55 130 7.8 38 55 150 11.1 39 55 170 13.2 40 55 190 14.6 41 55 210 14.7 42 55 230 16.0 44 55 270 16.8 45 55 290 25.0 46 55 310 17.1 47 55 330 19.3 48 55 350 19.5 49 45 5 16.3 50 45 15 15.6 51 45 25 12.4 52 45 35 9.2 53 45 45 11.7 54 45 55 10.7 62 45 135 8.7 63 45 145 10.2 64 45 155 13.7 65 45 165 14.8 66 45 175 14.6 67 45 185 15.1 68 45 195 16.9 69 45 205 17.7 70 45 215 18.0 71 45 225 18.0 72 45 235 15.0 77 45 285 13.8 78 45 295 14.9 79 45 305 17.9 80 45 315 19.0 81 45 325 19.6 82 45 335 20.9 83 45 345 19.3 84 45 355 18.6 85 35 5 15.0 86 35 15 13.9 87 35 25 9.9 88 35 35 6.5 90 35 55 6.0 96 35 115 16.0 97 35 125 17.3 98 35 135 17.1 99 35 145 19.1 100 35 155 17.6 101 35 165 17.4 102 35 175 16.8 103 35 185 17.1 104 35 195 18.6 105 35 205 18.4 106 35 215 18.3 107 35 225 16.1 108 35 235 11.8 109 35 245 9.4 112 35 275 15.2 113 35 285 17.4 114 35 295 18.6 115 35 305 19.2 116 35 315 17.8 117 35 325 17.4 118 35 335 17.8 119 35 345 14.9 120 35 355 13.9 124 25 35 3.2 125 25 45 4.8 126 25 55 1.5 127 25 65 2.0 128 25 75 8.1 129 25 85 11.9 130 25 95 12.4 131 25 105 21.6 132 25 115 16.2 133 25 125 16.5 134 25 135 14.8 135 25 145 11.9 136 25 155 12.1 137 25 165 11.0 138 25 175 11.7 139 25 185 12.5 140 25 195 13.4 141 25 205 12.3 142 25 215 13.8 143 25 225 18.4 144 25 235 16.8 145 25 245 10.1 146 25 255 11.7 147 25 265 14.8 148 25 275 15.6 149 25 285 16.5 150 25 295 14.9 151 25 305 14.4 152 25 315 13.9 153 25 325 13.2 154 25 335 11.8 155 25 345 9.7 160 15 35 3.0 161 15 45 3.1 162 15 55 5.0 163 15 65 7.9 164 15 75 17.8 165 15 85 15.0 166 15 95 17.8 167 15 105 22.0 168 15 115 17.4 169 15 125 16.6 170 15 135 16.5 171 15 145 14.8 172 15 155 15.7 173 15 165 14.0 174 15 175 15.3 175 15 185 12.9 176 15 195 16.2 177 15 205 14.9 178 15 215 16.6 179 15 225 19.8 180 15 235 18.4 181 15 245 16.1 182 15 255 16.5 183 15 265 22.1 184 15 275 22.3 185 15 285 16.7 186 15 295 13.5 187 15 305 15.1 188 15 315 15.9 189 15 325 16.5 190 15 335 15.2 191 15 345 13.1 193 5 5 26.9 197 5 45 6.9 198 5 55 8.5 199 5 65 14.1 200 5 75 22.6 201 5 85 27.4 202 5 95 36.1 203 5 105 29.4 204 5 115 27.7 205 5 125 21.2 206 5 135 23.7 207 5 145 22.0 208 5 155 22.0 209 5 165 19.9 210 5 175 17.7 211 5 185 17.9 212 5 195 18.0 213 5 205 17.8 214 5 215 18.2 215 5 225 17.6 216 5 235 19.0 217 5 245 19.2 218 5 255 23.4 219 5 265 25.7 220 5 275 33.4 221 5 285 37.4 223 5 305 15.6 224 5 315 15.6 225 5 325 15.5 226 5 335 23.3 227 5 345 22.7 228 5 355 21.9 229 -5 5 24.3 230 -5 15 34.2 232 -5 35 9.8 233 -5 45 8.3 234 -5 55 11.9 235 -5 65 21.7 236 -5 75 26.9 237 -5 85 32.6 238 -5 95 31.7 239 -5 105 28.1 240 -5 115 16.2 241 -5 125 10.7 242 -5 135 14.5 243 -5 145 26.5 244 -5 155 23.1 245 -5 165 22.5 246 -5 175 22.0 247 -5 185 12.7 248 -5 195 9.6 249 -5 205 6.4 250 -5 215 5.8 251 -5 225 5.7 252 -5 235 6.9 253 -5 245 10.2 254 -5 255 13.4 255 -5 265 15.7 256 -5 275 20.3 257 -5 285 22.6 260 -5 315 8.7 261 -5 325 7.8 262 -5 335 9.1 263 -5 345 16.6 264 -5 355 19.2 265 -15 5 21.1 266 -15 15 32.4 268 -15 35 6.7 269 -15 45 7.4 270 -15 55 12.1 271 -15 65 15.3 272 -15 75 18.3 273 -15 85 19.4 274 -15 95 17.1 275 -15 105 12.4 276 -15 115 5.0 277 -15 125 4.4 278 -15 135 7.8 279 -15 145 9.1 280 -15 155 13.3 281 -15 165 16.9 282 -15 175 22.8 283 -15 185 21.3 284 -15 195 20.6 285 -15 205 17.3 286 -15 215 13.8 287 -15 225 9.9 288 -15 235 11.3 289 -15 245 15.2 290 -15 255 17.0 291 -15 265 21.8 292 -15 275 15.8 293 -15 285 15.0 297 -15 325 16.4 298 -15 335 13.7 299 -15 345 21.2 300 -15 355 22.7 301 -25 5 14.5 302 -25 15 16.0 304 -25 35 12.8 305 -25 45 14.0 306 -25 55 14.8 307 -25 65 18.0 308 -25 75 15.8 309 -25 85 16.8 310 -25 95 16.1 311 -25 105 16.6 312 -25 115 7.9 315 -25 145 5.3 316 -25 155 11.6 317 -25 165 12.8 318 -25 175 17.7 319 -25 185 19.0 320 -25 195 21.7 321 -25 205 19.4 322 -25 215 23.9 323 -25 225 21.5 324 -25 235 19.8 325 -25 245 17.6 326 -25 255 15.6 327 -25 265 15.5 328 -25 275 10.9 329 -25 285 9.8 332 -25 315 25.9 333 -25 325 22.0 334 -25 335 21.7 335 -25 345 20.4 336 -25 355 20.1 337 -35 5 21.6 338 -35 15 13.7 339 -35 25 15.9 340 -35 35 16.9 341 -35 45 16.8 342 -35 55 17.2 343 -35 65 19.3 344 -35 75 16.1 345 -35 85 17.4 346 -35 95 19.5 347 -35 105 18.3 348 -35 115 15.3 349 -35 125 18.4 350 -35 135 18.7 351 -35 145 16.9 352 -35 155 15.9 353 -35 165 17.5 354 -35 175 18.8 355 -35 185 18.9 356 -35 195 19.6 357 -35 205 19.0 358 -35 215 21.9 359 -35 225 16.3 360 -35 235 22.5 361 -35 245 14.5 362 -35 255 20.9 363 -35 265 16.6 364 -35 275 15.0 365 -35 285 11.2 367 -35 305 16.1 368 -35 315 18.0 369 -35 325 18.7 370 -35 335 18.7 371 -35 345 24.1 372 -35 355 24.4 377 -45 45 19.2 379 -45 65 27.5 380 -45 75 21.7 383 -45 105 21.2 384 -45 115 18.3 385 -45 125 19.6 386 -45 135 17.8 387 -45 145 18.7 388 -45 155 17.0 389 -45 165 20.0 390 -45 175 17.6 391 -45 185 14.8 392 -45 195 21.1 393 -45 205 11.5 394 -45 215 22.6 400 -45 275 13.0 401 -45 285 15.7 402 -45 295 16.1 403 -45 305 19.1 404 -45 315 16.7 405 -45 325 23.1 408 -45 355 19.4 411 -55 50 18.3 415 -55 130 12.3 416 -55 150 9.1 417 -55 170 20.9 422 -55 270 11.1 423 -55 290 22.0 424 -55 310 30.3 425 -55 330 28.8 430 -65 70 10.5 432 -65 110 10.7 442 -65 310 18.9