Altocumulus Average Cloud Amount (%) January (1954 - 1997) , Ship Observations Only Global Average: 17.6 Zonal Averages 17 zones Lat.N Average 85 13.7 75 13.0 65 13.7 55 12.2 45 12.9 35 16.0 25 14.0 15 11.9 5 19.2 -5 20.3 -15 18.7 -25 17.3 -35 17.0 -45 19.7 -55 24.3 -65 24.1 -75 21.7 Grid Box Averages 382 filled boxes Box # Lat.N Lon.E Average 1 85 60 19.2 2 85 180 11.3 3 85 300 9.5 4 75 20 15.8 5 75 60 10.4 7 75 140 9.3 8 75 180 14.3 9 75 220 14.7 12 75 340 11.8 13 65 10 18.4 14 65 30 13.2 15 65 50 14.3 21 65 170 6.1 22 65 190 4.2 23 65 210 6.3 29 65 330 15.5 30 65 350 17.1 31 55 10 14.7 32 55 30 21.9 38 55 150 8.1 39 55 170 10.0 40 55 190 10.7 41 55 210 11.8 42 55 230 12.9 46 55 310 10.7 47 55 330 16.2 48 55 350 15.3 49 45 5 15.2 50 45 15 16.5 51 45 25 13.6 52 45 35 11.8 53 45 45 10.8 54 45 55 11.5 62 45 135 7.1 63 45 145 8.2 64 45 155 9.6 65 45 165 9.8 66 45 175 9.4 67 45 185 9.9 68 45 195 11.5 69 45 205 13.0 70 45 215 14.8 71 45 225 14.7 72 45 235 15.0 77 45 285 11.0 78 45 295 12.5 79 45 305 13.8 80 45 315 15.5 81 45 325 16.1 82 45 335 16.4 83 45 345 16.7 84 45 355 15.4 85 35 5 14.8 86 35 15 14.6 87 35 25 15.6 88 35 35 15.8 90 35 55 5.7 96 35 115 4.5 97 35 125 13.8 98 35 135 12.8 99 35 145 10.8 100 35 155 13.5 101 35 165 13.4 102 35 175 14.4 103 35 185 14.0 104 35 195 15.0 105 35 205 16.1 106 35 215 19.3 107 35 225 17.7 108 35 235 13.9 109 35 245 10.9 112 35 275 16.2 113 35 285 19.1 114 35 295 19.9 115 35 305 19.0 116 35 315 18.7 117 35 325 18.1 118 35 335 19.2 119 35 345 16.4 120 35 355 13.6 124 25 35 6.7 125 25 45 12.9 126 25 55 8.8 127 25 65 4.5 128 25 75 2.9 129 25 85 4.6 130 25 95 7.2 132 25 115 17.7 133 25 125 17.4 134 25 135 14.5 135 25 145 14.6 136 25 155 14.4 137 25 165 13.2 138 25 175 12.7 139 25 185 13.5 140 25 195 13.1 141 25 205 13.4 142 25 215 16.8 143 25 225 19.6 144 25 235 20.1 145 25 245 14.3 146 25 255 16.0 147 25 265 20.6 148 25 275 15.9 149 25 285 14.2 150 25 295 12.0 151 25 305 11.6 152 25 315 12.6 153 25 325 11.9 154 25 335 11.0 155 25 345 8.6 160 15 35 10.4 161 15 45 7.0 162 15 55 6.0 163 15 65 5.3 164 15 75 4.7 165 15 85 7.4 166 15 95 8.4 167 15 105 14.5 168 15 115 14.5 169 15 125 13.7 170 15 135 15.0 171 15 145 11.9 172 15 155 9.5 173 15 165 7.8 174 15 175 9.2 175 15 185 9.5 176 15 195 12.2 177 15 205 13.1 178 15 215 16.3 179 15 225 18.9 180 15 235 21.4 181 15 245 18.0 182 15 255 10.8 183 15 265 6.5 184 15 275 11.5 185 15 285 8.6 186 15 295 8.8 187 15 305 9.8 188 15 315 11.3 189 15 325 16.2 190 15 335 16.5 191 15 345 12.7 193 5 5 16.5 197 5 45 8.6 198 5 55 9.4 199 5 65 10.8 200 5 75 12.0 201 5 85 20.2 202 5 95 23.6 203 5 105 23.4 204 5 115 23.5 205 5 125 21.6 206 5 135 30.1 207 5 145 19.1 208 5 155 19.1 209 5 165 20.4 210 5 175 22.9 211 5 185 21.2 212 5 195 20.8 213 5 205 18.4 214 5 215 15.6 215 5 225 17.2 216 5 235 17.0 217 5 245 20.9 218 5 255 18.1 219 5 265 18.5 220 5 275 17.7 221 5 285 19.0 223 5 305 17.5 224 5 315 24.1 225 5 325 25.7 226 5 335 22.6 227 5 345 13.8 228 5 355 15.8 229 -5 5 23.1 230 -5 15 18.5 232 -5 35 18.0 233 -5 45 13.3 234 -5 55 17.8 235 -5 65 23.4 236 -5 75 26.2 237 -5 85 26.9 238 -5 95 31.0 239 -5 105 36.6 240 -5 115 37.6 241 -5 125 30.7 242 -5 135 30.4 243 -5 145 32.1 244 -5 155 27.2 245 -5 165 29.3 246 -5 175 30.8 247 -5 185 23.8 248 -5 195 13.5 249 -5 205 10.2 250 -5 215 8.7 251 -5 225 7.2 252 -5 235 8.0 253 -5 245 11.2 254 -5 255 16.3 255 -5 265 16.3 256 -5 275 26.4 257 -5 285 18.2 260 -5 315 21.8 261 -5 325 14.8 262 -5 335 11.6 263 -5 345 13.1 264 -5 355 14.1 265 -15 5 21.0 266 -15 15 20.6 268 -15 35 15.4 269 -15 45 21.1 270 -15 55 17.0 271 -15 65 16.7 272 -15 75 17.3 273 -15 85 16.9 274 -15 95 19.4 275 -15 105 19.3 276 -15 115 14.2 277 -15 125 20.3 278 -15 135 26.6 279 -15 145 25.3 280 -15 155 17.7 281 -15 165 18.4 282 -15 175 25.4 283 -15 185 27.4 284 -15 195 27.7 285 -15 205 22.4 286 -15 215 14.4 287 -15 225 13.1 288 -15 235 14.6 289 -15 245 15.9 290 -15 255 17.5 291 -15 265 19.5 292 -15 275 19.9 293 -15 285 20.1 297 -15 325 16.7 298 -15 335 11.4 299 -15 345 14.4 300 -15 355 18.8 301 -25 5 14.0 302 -25 15 13.8 304 -25 35 13.9 305 -25 45 14.8 306 -25 55 16.2 307 -25 65 16.5 308 -25 75 16.8 309 -25 85 16.5 310 -25 95 19.1 311 -25 105 16.6 312 -25 115 9.9 315 -25 145 18.1 316 -25 155 16.4 317 -25 165 17.2 318 -25 175 20.0 319 -25 185 20.0 320 -25 195 26.5 321 -25 205 26.1 322 -25 215 22.8 323 -25 225 15.6 324 -25 235 15.6 325 -25 245 13.8 326 -25 255 15.4 327 -25 265 18.7 328 -25 275 15.9 329 -25 285 16.2 332 -25 315 23.7 333 -25 325 18.9 334 -25 335 14.8 335 -25 345 11.0 336 -25 355 15.7 337 -35 5 16.3 338 -35 15 9.4 339 -35 25 13.9 340 -35 35 17.3 341 -35 45 18.0 342 -35 55 17.1 343 -35 65 16.9 344 -35 75 15.9 345 -35 85 19.3 346 -35 95 21.2 347 -35 105 17.8 348 -35 115 11.4 349 -35 125 17.7 350 -35 135 17.7 351 -35 145 15.1 352 -35 155 15.4 353 -35 165 18.4 354 -35 175 17.9 355 -35 185 20.6 356 -35 195 19.8 357 -35 205 22.5 358 -35 215 18.4 359 -35 225 17.9 360 -35 235 18.8 361 -35 245 16.4 362 -35 255 20.1 363 -35 265 12.9 364 -35 275 11.7 365 -35 285 10.1 367 -35 305 14.0 368 -35 315 15.2 369 -35 325 16.3 370 -35 335 20.2 371 -35 345 17.6 372 -35 355 17.9 373 -45 5 17.8 374 -45 15 21.4 375 -45 25 22.1 376 -45 35 25.6 377 -45 45 18.4 378 -45 55 20.0 379 -45 65 24.5 380 -45 75 27.6 381 -45 85 22.0 382 -45 95 20.3 383 -45 105 18.0 384 -45 115 19.5 385 -45 125 20.7 386 -45 135 22.9 387 -45 145 22.8 388 -45 155 19.1 389 -45 165 19.6 390 -45 175 19.5 391 -45 185 19.8 392 -45 195 23.4 393 -45 205 16.7 394 -45 215 18.3 395 -45 225 20.9 396 -45 235 18.4 397 -45 245 18.2 398 -45 255 17.3 399 -45 265 15.0 400 -45 275 9.3 401 -45 285 12.3 402 -45 295 13.3 403 -45 305 17.5 404 -45 315 19.7 405 -45 325 21.0 406 -45 335 16.8 407 -45 345 21.1 408 -45 355 22.7 409 -55 10 30.8 410 -55 30 28.6 411 -55 50 35.3 412 -55 70 24.5 413 -55 90 28.5 414 -55 110 23.4 415 -55 130 19.1 416 -55 150 17.2 417 -55 170 25.4 418 -55 190 28.1 419 -55 210 21.8 420 -55 230 16.6 421 -55 250 18.2 422 -55 270 15.1 423 -55 290 22.2 424 -55 310 27.9 425 -55 330 28.8 426 -55 350 25.2 427 -65 10 24.9 428 -65 30 26.8 429 -65 50 23.5 430 -65 70 23.0 431 -65 90 26.8 432 -65 110 15.8 433 -65 130 22.8 434 -65 150 22.9 435 -65 170 21.1 436 -65 190 23.2 437 -65 210 22.7 438 -65 230 15.9 439 -65 250 22.0 440 -65 270 30.6 441 -65 290 22.2 442 -65 310 37.5 443 -65 330 28.6 444 -65 350 20.5 449 -75 180 18.8 450 -75 220 19.3 452 -75 300 31.9 453 -75 340 20.3