Altocumulus Average Cloud Amount (%) February (1954 - 1997) Day, Ship Observations Only Global Average: 17.5 Zonal Averages 17 zones Lat.N Average 85 12.5 75 16.1 65 15.6 55 13.5 45 13.9 35 16.9 25 14.0 15 11.0 5 18.3 -5 19.8 -15 18.0 -25 17.0 -35 17.8 -45 19.2 -55 24.5 -65 21.8 -75 17.3 Grid Box Averages 378 filled boxes Box # Lat.N Lon.E Average 1 85 60 10.6 2 85 180 12.2 3 85 300 15.8 4 75 20 17.6 5 75 60 16.5 7 75 140 12.0 8 75 180 13.0 9 75 220 16.2 12 75 340 24.6 13 65 10 21.0 14 65 30 14.6 15 65 50 16.4 21 65 170 5.3 22 65 190 3.9 23 65 210 12.1 29 65 330 17.9 30 65 350 20.1 31 55 10 16.5 32 55 30 20.0 38 55 150 9.1 39 55 170 10.8 40 55 190 10.4 41 55 210 13.3 42 55 230 14.5 46 55 310 12.2 47 55 330 17.8 48 55 350 18.6 49 45 5 16.5 50 45 15 15.9 51 45 25 13.1 52 45 35 11.6 53 45 45 9.9 54 45 55 14.4 62 45 135 7.5 63 45 145 8.5 64 45 155 8.9 65 45 165 10.5 66 45 175 11.6 67 45 185 11.5 68 45 195 12.2 69 45 205 13.4 70 45 215 15.3 71 45 225 17.3 72 45 235 16.2 77 45 285 10.9 78 45 295 12.8 79 45 305 14.5 80 45 315 16.9 81 45 325 16.9 82 45 335 18.8 83 45 345 17.9 84 45 355 16.8 85 35 5 17.0 86 35 15 16.4 87 35 25 15.8 88 35 35 14.3 90 35 55 13.3 96 35 115 5.6 97 35 125 14.9 98 35 135 13.9 99 35 145 12.5 100 35 155 14.6 101 35 165 14.0 102 35 175 14.5 103 35 185 14.9 104 35 195 15.9 105 35 205 18.7 106 35 215 19.0 107 35 225 18.9 108 35 235 15.5 109 35 245 11.2 112 35 275 15.3 113 35 285 19.3 114 35 295 20.8 115 35 305 20.3 116 35 315 20.3 117 35 325 19.7 118 35 335 19.9 119 35 345 15.6 120 35 355 15.9 124 25 35 6.2 125 25 45 12.9 126 25 55 8.1 127 25 65 4.5 128 25 75 1.9 129 25 85 4.5 132 25 115 19.4 133 25 125 17.1 134 25 135 14.5 135 25 145 14.8 136 25 155 14.3 137 25 165 13.8 138 25 175 13.1 139 25 185 12.0 140 25 195 12.4 141 25 205 13.4 142 25 215 16.8 143 25 225 19.4 144 25 235 17.1 145 25 245 13.8 146 25 255 12.5 147 25 265 18.7 148 25 275 15.1 149 25 285 13.8 150 25 295 12.7 151 25 305 12.9 152 25 315 14.0 153 25 325 15.1 154 25 335 11.0 155 25 345 8.4 160 15 35 10.4 161 15 45 8.4 162 15 55 4.8 163 15 65 3.6 164 15 75 3.2 165 15 85 3.9 166 15 95 5.3 167 15 105 12.5 168 15 115 11.3 169 15 125 12.4 170 15 135 12.3 171 15 145 11.2 172 15 155 10.0 173 15 165 9.1 174 15 175 10.0 175 15 185 10.6 176 15 195 11.6 177 15 205 13.2 178 15 215 16.0 179 15 225 19.8 180 15 235 22.8 181 15 245 16.2 182 15 255 8.6 183 15 265 4.8 184 15 275 8.5 185 15 285 8.6 186 15 295 10.5 187 15 305 11.1 188 15 315 12.4 189 15 325 12.9 190 15 335 11.1 191 15 345 8.9 193 5 5 17.7 197 5 45 5.3 198 5 55 7.4 199 5 65 6.9 200 5 75 9.9 201 5 85 17.2 202 5 95 21.5 203 5 105 20.2 204 5 115 23.3 205 5 125 23.5 206 5 135 24.5 207 5 145 22.6 208 5 155 22.9 209 5 165 25.8 210 5 175 21.0 211 5 185 15.8 212 5 195 17.3 213 5 205 19.7 214 5 215 20.4 215 5 225 19.5 216 5 235 19.8 217 5 245 17.5 218 5 255 14.5 219 5 265 15.4 220 5 275 14.5 221 5 285 17.2 223 5 305 17.2 224 5 315 23.8 225 5 325 24.4 226 5 335 18.0 227 5 345 13.8 228 5 355 15.5 229 -5 5 18.8 230 -5 15 23.8 232 -5 35 9.5 233 -5 45 12.1 234 -5 55 13.3 235 -5 65 18.6 236 -5 75 25.2 237 -5 85 24.7 238 -5 95 27.1 239 -5 105 35.4 240 -5 115 38.1 241 -5 125 31.4 242 -5 135 34.5 243 -5 145 35.6 244 -5 155 31.5 245 -5 165 35.5 246 -5 175 32.3 247 -5 185 17.4 248 -5 195 16.6 249 -5 205 13.4 250 -5 215 11.7 251 -5 225 8.9 252 -5 235 10.2 253 -5 245 11.2 254 -5 255 14.9 255 -5 265 17.2 256 -5 275 19.9 257 -5 285 18.2 260 -5 315 28.7 261 -5 325 16.8 262 -5 335 12.0 263 -5 345 7.5 264 -5 355 10.0 265 -15 5 16.0 266 -15 15 25.1 268 -15 35 17.5 269 -15 45 24.6 270 -15 55 18.3 271 -15 65 17.6 272 -15 75 19.1 273 -15 85 18.3 274 -15 95 18.7 275 -15 105 17.2 276 -15 115 16.3 277 -15 125 25.7 278 -15 135 30.1 279 -15 145 27.4 280 -15 155 22.1 281 -15 165 22.3 282 -15 175 24.2 283 -15 185 27.9 284 -15 195 23.8 285 -15 205 22.0 286 -15 215 16.4 287 -15 225 15.7 288 -15 235 12.7 289 -15 245 13.7 290 -15 255 14.8 291 -15 265 14.3 292 -15 275 14.6 293 -15 285 19.0 297 -15 325 14.1 298 -15 335 8.8 299 -15 345 9.0 300 -15 355 12.2 301 -25 5 12.4 302 -25 15 16.3 304 -25 35 13.5 305 -25 45 13.9 306 -25 55 16.8 307 -25 65 16.2 308 -25 75 16.8 309 -25 85 14.6 310 -25 95 17.1 311 -25 105 17.5 312 -25 115 11.7 315 -25 145 15.9 316 -25 155 16.8 317 -25 165 18.8 318 -25 175 20.3 319 -25 185 23.8 320 -25 195 21.7 321 -25 205 24.6 322 -25 215 19.7 323 -25 225 16.6 324 -25 235 18.2 325 -25 245 14.0 326 -25 255 14.6 327 -25 265 15.2 328 -25 275 15.1 329 -25 285 21.8 332 -25 315 20.9 333 -25 325 16.4 334 -25 335 14.2 335 -25 345 12.4 336 -25 355 15.3 337 -35 5 16.4 338 -35 15 10.5 339 -35 25 14.5 340 -35 35 15.9 341 -35 45 18.1 342 -35 55 18.2 343 -35 65 18.9 344 -35 75 20.0 345 -35 85 21.4 346 -35 95 19.6 347 -35 105 19.4 348 -35 115 13.6 349 -35 125 19.8 350 -35 135 18.1 351 -35 145 14.8 352 -35 155 15.7 353 -35 165 18.4 354 -35 175 19.6 355 -35 185 19.6 356 -35 195 22.4 357 -35 205 20.9 358 -35 215 22.6 359 -35 225 23.9 360 -35 235 18.3 361 -35 245 14.7 362 -35 255 15.1 363 -35 265 11.8 364 -35 275 12.5 365 -35 285 11.5 367 -35 305 13.1 368 -35 315 16.6 369 -35 325 22.5 370 -35 335 20.9 371 -35 345 17.3 372 -35 355 18.6 373 -45 5 24.7 374 -45 15 23.5 375 -45 25 20.4 376 -45 35 22.6 377 -45 45 19.9 378 -45 55 22.1 379 -45 65 20.4 380 -45 75 22.9 381 -45 85 23.4 382 -45 95 14.6 383 -45 105 19.4 384 -45 115 24.7 385 -45 125 20.9 386 -45 135 23.8 387 -45 145 20.0 388 -45 155 17.7 389 -45 165 16.5 390 -45 175 18.6 391 -45 185 20.7 392 -45 195 19.2 393 -45 205 16.9 394 -45 215 18.4 395 -45 225 12.5 399 -45 265 14.7 400 -45 275 11.3 401 -45 285 15.7 402 -45 295 13.7 403 -45 305 14.7 404 -45 315 18.6 405 -45 325 21.4 406 -45 335 13.2 407 -45 345 24.1 408 -45 355 16.8 409 -55 10 31.0 410 -55 30 23.7 411 -55 50 44.8 412 -55 70 22.4 413 -55 90 24.9 414 -55 110 19.9 415 -55 130 22.2 416 -55 150 19.4 417 -55 170 21.1 418 -55 190 19.6 419 -55 210 26.6 421 -55 250 16.0 422 -55 270 18.4 423 -55 290 24.4 424 -55 310 26.3 425 -55 330 24.8 426 -55 350 30.4 427 -65 10 21.9 428 -65 30 26.2 429 -65 50 21.3 430 -65 70 18.8 431 -65 90 17.1 432 -65 110 15.4 433 -65 130 21.6 434 -65 150 20.9 435 -65 170 18.0 436 -65 190 19.3 437 -65 210 22.6 438 -65 230 18.2 439 -65 250 25.3 440 -65 270 20.6 441 -65 290 22.9 442 -65 310 33.5 443 -65 330 19.5 444 -65 350 25.1 449 -75 180 18.3 450 -75 220 12.4 451 -75 260 19.1 452 -75 300 19.3 453 -75 340 19.0