Altocumulus Average Cloud Amount (%) December (1953 - 1996) Day, Ship Observations Only Global Average: 17.9 Zonal Averages 17 zones Lat.N Average 85 7.9 75 12.1 65 14.3 55 14.2 45 15.0 35 17.3 25 14.4 15 13.2 5 20.4 -5 18.9 -15 17.5 -25 18.0 -35 18.2 -45 20.5 -55 23.9 -65 22.7 -75 16.3 Grid Box Averages 371 filled boxes Box # Lat.N Lon.E Average 2 85 180 7.9 4 75 20 16.3 5 75 60 10.7 8 75 180 12.6 9 75 220 8.6 13 65 10 20.6 14 65 30 13.3 15 65 50 10.0 21 65 170 5.8 22 65 190 4.2 23 65 210 12.5 27 65 290 13.0 28 65 310 17.0 29 65 330 15.7 30 65 350 17.7 31 55 10 17.8 32 55 30 20.1 38 55 150 9.3 39 55 170 11.9 40 55 190 11.9 41 55 210 13.0 42 55 230 14.1 46 55 310 13.2 47 55 330 18.9 48 55 350 18.6 49 45 5 17.6 50 45 15 17.5 51 45 25 17.3 52 45 35 15.6 53 45 45 11.8 54 45 55 12.2 62 45 135 8.2 63 45 145 10.1 64 45 155 11.4 65 45 165 11.8 66 45 175 11.7 67 45 185 12.2 68 45 195 12.3 69 45 205 13.4 70 45 215 15.3 71 45 225 16.3 72 45 235 17.4 77 45 285 16.4 78 45 295 14.9 79 45 305 18.2 80 45 315 18.5 81 45 325 18.8 82 45 335 19.5 83 45 345 17.9 84 45 355 18.4 85 35 5 17.1 86 35 15 16.7 87 35 25 17.1 88 35 35 15.1 90 35 55 12.4 96 35 115 6.8 97 35 125 14.8 98 35 135 14.3 99 35 145 13.0 100 35 155 15.6 101 35 165 16.0 102 35 175 15.2 103 35 185 16.9 104 35 195 17.1 105 35 205 18.5 106 35 215 19.1 107 35 225 18.3 108 35 235 13.9 109 35 245 9.7 112 35 275 18.8 113 35 285 20.7 114 35 295 20.9 115 35 305 20.0 116 35 315 20.9 117 35 325 19.9 118 35 335 19.7 119 35 345 16.5 120 35 355 15.4 124 25 35 6.8 125 25 45 15.8 126 25 55 7.6 127 25 65 4.9 128 25 75 4.0 129 25 85 5.5 131 25 105 37.2 132 25 115 17.6 133 25 125 18.4 134 25 135 15.7 135 25 145 15.1 136 25 155 14.6 137 25 165 12.9 138 25 175 11.8 139 25 185 11.3 140 25 195 12.6 141 25 205 13.3 142 25 215 16.9 143 25 225 17.7 144 25 235 19.1 145 25 245 14.7 146 25 255 19.3 147 25 265 20.0 148 25 275 16.6 149 25 285 14.9 150 25 295 13.4 151 25 305 12.7 152 25 315 14.2 153 25 325 14.2 154 25 335 12.9 155 25 345 10.2 160 15 35 8.2 161 15 45 4.7 162 15 55 5.7 163 15 65 6.6 164 15 75 8.2 165 15 85 11.1 166 15 95 9.8 167 15 105 18.2 168 15 115 16.2 169 15 125 15.6 170 15 135 14.1 171 15 145 11.4 172 15 155 10.2 173 15 165 8.8 174 15 175 9.9 175 15 185 11.3 176 15 195 12.3 177 15 205 14.0 178 15 215 17.4 179 15 225 19.3 180 15 235 21.7 181 15 245 21.5 182 15 255 14.7 183 15 265 7.5 184 15 275 12.6 185 15 285 11.4 186 15 295 11.2 187 15 305 11.7 188 15 315 14.6 189 15 325 17.2 190 15 335 16.0 191 15 345 13.4 193 5 5 16.6 197 5 45 8.4 198 5 55 11.3 199 5 65 13.3 200 5 75 17.5 201 5 85 24.4 202 5 95 28.6 203 5 105 28.2 204 5 115 27.4 205 5 125 22.7 206 5 135 24.7 207 5 145 22.1 208 5 155 22.0 209 5 165 24.6 210 5 175 23.1 211 5 185 17.0 212 5 195 21.7 213 5 205 17.8 214 5 215 19.1 215 5 225 18.1 216 5 235 21.7 217 5 245 20.2 218 5 255 16.6 219 5 265 17.8 220 5 275 20.2 221 5 285 22.7 223 5 305 18.3 224 5 315 21.3 225 5 325 21.8 226 5 335 24.1 227 5 345 17.3 228 5 355 17.5 229 -5 5 23.0 230 -5 15 24.5 232 -5 35 10.5 233 -5 45 13.1 234 -5 55 17.4 235 -5 65 21.5 236 -5 75 23.1 237 -5 85 27.4 238 -5 95 25.6 239 -5 105 35.5 240 -5 115 37.6 241 -5 125 28.9 242 -5 135 28.3 243 -5 145 32.9 244 -5 155 26.2 245 -5 165 24.7 246 -5 175 29.1 247 -5 185 22.7 248 -5 195 15.9 249 -5 205 8.3 250 -5 215 6.5 251 -5 225 6.2 252 -5 235 8.4 253 -5 245 10.7 254 -5 255 14.9 255 -5 265 15.7 256 -5 275 18.1 257 -5 285 18.1 260 -5 315 14.2 261 -5 325 10.6 262 -5 335 10.7 263 -5 345 13.9 264 -5 355 14.1 265 -15 5 16.4 266 -15 15 22.1 268 -15 35 16.1 269 -15 45 19.2 270 -15 55 13.8 271 -15 65 13.8 272 -15 75 17.9 273 -15 85 16.9 274 -15 95 18.2 275 -15 105 14.6 276 -15 115 10.6 277 -15 125 15.4 278 -15 135 22.6 279 -15 145 17.4 280 -15 155 14.7 281 -15 165 19.5 282 -15 175 20.0 283 -15 185 23.5 284 -15 195 25.0 285 -15 205 21.6 286 -15 215 21.3 287 -15 225 13.9 288 -15 235 13.2 289 -15 245 17.5 290 -15 255 19.5 291 -15 265 16.2 292 -15 275 17.7 293 -15 285 19.7 297 -15 325 18.6 298 -15 335 12.6 299 -15 345 19.0 300 -15 355 18.8 301 -25 5 11.5 302 -25 15 13.3 304 -25 35 14.9 305 -25 45 15.8 306 -25 55 16.8 307 -25 65 14.8 308 -25 75 14.8 309 -25 85 15.9 310 -25 95 17.7 311 -25 105 16.8 312 -25 115 7.9 315 -25 145 12.0 316 -25 155 13.3 317 -25 165 15.5 318 -25 175 18.4 319 -25 185 17.1 320 -25 195 20.5 321 -25 205 20.1 322 -25 215 24.9 323 -25 225 24.0 324 -25 235 19.6 325 -25 245 17.0 326 -25 255 17.9 327 -25 265 19.6 328 -25 275 14.7 329 -25 285 22.0 332 -25 315 26.4 333 -25 325 26.2 334 -25 335 19.5 335 -25 345 17.0 336 -25 355 17.7 337 -35 5 15.7 338 -35 15 10.3 339 -35 25 14.4 340 -35 35 17.5 341 -35 45 16.0 342 -35 55 17.2 343 -35 65 17.6 344 -35 75 17.7 345 -35 85 19.7 346 -35 95 20.0 347 -35 105 20.2 348 -35 115 16.0 349 -35 125 20.3 350 -35 135 19.1 351 -35 145 19.4 352 -35 155 16.7 353 -35 165 18.3 354 -35 175 19.3 355 -35 185 19.8 356 -35 195 21.9 357 -35 205 21.9 358 -35 215 20.9 359 -35 225 20.6 360 -35 235 19.1 361 -35 245 23.9 362 -35 255 19.3 363 -35 265 14.3 364 -35 275 12.8 365 -35 285 10.3 367 -35 305 14.6 368 -35 315 19.5 369 -35 325 17.5 370 -35 335 21.4 371 -35 345 20.5 372 -35 355 20.2 373 -45 5 25.5 374 -45 15 21.6 375 -45 25 25.9 376 -45 35 23.5 377 -45 45 20.0 378 -45 55 13.1 379 -45 65 23.6 380 -45 75 22.5 381 -45 85 23.5 382 -45 95 21.8 383 -45 105 22.3 384 -45 115 20.5 385 -45 125 20.3 386 -45 135 21.8 387 -45 145 22.6 388 -45 155 19.8 389 -45 165 23.2 390 -45 175 20.1 391 -45 185 19.7 392 -45 195 21.0 393 -45 205 17.9 394 -45 215 16.2 395 -45 225 17.4 399 -45 265 12.7 400 -45 275 14.3 401 -45 285 17.2 402 -45 295 14.2 403 -45 305 18.7 404 -45 315 20.5 405 -45 325 22.2 406 -45 335 23.4 407 -45 345 19.0 408 -45 355 25.9 409 -55 10 23.3 410 -55 30 22.2 411 -55 50 26.4 412 -55 70 24.8 413 -55 90 23.7 414 -55 110 22.4 415 -55 130 20.9 416 -55 150 14.1 417 -55 170 22.9 420 -55 230 28.9 421 -55 250 24.0 422 -55 270 14.9 423 -55 290 22.2 424 -55 310 28.1 425 -55 330 28.3 426 -55 350 35.8 427 -65 10 22.2 428 -65 30 21.1 429 -65 50 27.1 430 -65 70 20.2 431 -65 90 25.1 432 -65 110 19.3 433 -65 130 17.6 434 -65 150 22.2 435 -65 170 21.6 436 -65 190 28.3 437 -65 210 21.1 438 -65 230 18.9 441 -65 290 20.5 442 -65 310 38.0 443 -65 330 23.6 444 -65 350 15.3 449 -75 180 15.9 453 -75 340 17.0