Altocumulus Average Cloud Amount (%) June, July, August (1954 - 1997) Day, Ship Observations Only Global Average: 17.3 Zonal Averages 16 zones Lat.N Average 85 18.6 75 19.9 65 21.6 55 19.6 45 19.0 35 15.7 25 13.7 15 18.2 5 23.7 -5 16.0 -15 14.7 -25 15.7 -35 16.1 -45 16.8 -55 17.4 -65 17.7 Grid Box Averages 377 filled boxes Box # Lat.N Lon.E Average 1 85 60 23.9 2 85 180 15.7 3 85 300 15.6 4 75 20 22.4 5 75 60 19.4 6 75 100 21.4 7 75 140 19.1 8 75 180 17.7 9 75 220 18.6 10 75 260 22.2 11 75 300 20.3 12 75 340 21.0 13 65 10 23.6 14 65 30 16.4 15 65 50 16.3 16 65 70 13.6 20 65 150 13.8 21 65 170 13.8 22 65 190 17.7 23 65 210 22.9 24 65 230 25.9 25 65 250 30.0 26 65 270 23.6 27 65 290 22.3 28 65 310 22.0 29 65 330 23.1 30 65 350 23.4 31 55 10 19.2 32 55 30 16.4 37 55 130 9.0 38 55 150 14.4 39 55 170 16.0 40 55 190 19.8 41 55 210 22.8 42 55 230 22.7 44 55 270 18.5 45 55 290 21.6 46 55 310 18.6 47 55 330 22.2 48 55 350 22.5 49 45 5 9.5 50 45 15 7.6 51 45 25 7.1 52 45 35 6.2 53 45 45 7.9 54 45 55 6.9 61 45 125 11.2 62 45 135 16.1 63 45 145 15.8 64 45 155 18.2 65 45 165 17.9 66 45 175 19.5 67 45 185 21.5 68 45 195 22.5 69 45 205 23.0 70 45 215 25.0 71 45 225 23.3 72 45 235 15.2 77 45 285 15.2 78 45 295 16.3 79 45 305 18.4 80 45 315 19.0 81 45 325 19.5 82 45 335 20.3 83 45 345 18.1 84 45 355 16.1 85 35 5 7.5 86 35 15 4.8 87 35 25 2.2 88 35 35 2.0 89 35 45 12.5 90 35 55 7.9 96 35 115 14.5 97 35 125 19.4 98 35 135 19.8 99 35 145 19.1 100 35 155 18.8 101 35 165 20.4 102 35 175 18.5 103 35 185 19.4 104 35 195 18.7 105 35 205 19.2 106 35 215 19.6 107 35 225 17.5 108 35 235 12.8 109 35 245 8.2 112 35 275 18.0 113 35 285 18.8 114 35 295 16.8 115 35 305 14.4 116 35 315 12.9 117 35 325 13.2 118 35 335 14.8 119 35 345 10.1 120 35 355 6.6 124 25 35 2.4 125 25 45 3.2 126 25 55 5.5 127 25 65 14.5 128 25 75 22.4 129 25 85 23.2 130 25 95 30.5 131 25 105 21.0 132 25 115 20.2 133 25 125 17.6 134 25 135 17.0 135 25 145 15.7 136 25 155 15.3 137 25 165 14.9 138 25 175 13.6 139 25 185 11.8 140 25 195 11.0 141 25 205 11.7 142 25 215 16.4 143 25 225 19.7 144 25 235 18.3 145 25 245 12.0 146 25 255 15.4 147 25 265 14.8 148 25 275 16.6 149 25 285 14.4 150 25 295 11.7 151 25 305 10.0 152 25 315 9.5 153 25 325 10.4 154 25 335 10.5 155 25 345 7.6 156 25 355 6.8 160 15 35 6.6 161 15 45 9.3 162 15 55 9.9 163 15 65 19.2 164 15 75 26.1 165 15 85 23.7 166 15 95 31.8 167 15 105 25.9 168 15 115 22.8 169 15 125 21.4 170 15 135 20.8 171 15 145 18.1 172 15 155 16.4 173 15 165 14.3 174 15 175 13.4 175 15 185 13.3 176 15 195 13.8 177 15 205 14.0 178 15 215 17.7 179 15 225 21.2 180 15 235 22.5 181 15 245 20.6 182 15 255 24.2 183 15 265 29.0 184 15 275 22.8 185 15 285 14.3 186 15 295 12.0 187 15 305 12.2 188 15 315 15.1 189 15 325 17.3 190 15 335 17.3 191 15 345 17.9 193 5 5 28.1 197 5 45 12.1 198 5 55 9.6 199 5 65 18.4 200 5 75 25.8 201 5 85 26.2 202 5 95 35.3 203 5 105 28.9 204 5 115 29.0 205 5 125 27.0 206 5 135 31.9 207 5 145 23.1 208 5 155 22.2 209 5 165 23.6 210 5 175 25.7 211 5 185 22.4 212 5 195 20.8 213 5 205 19.5 214 5 215 19.3 215 5 225 18.2 216 5 235 19.0 217 5 245 20.4 218 5 255 27.3 219 5 265 28.9 220 5 275 37.7 221 5 285 37.8 222 5 295 26.2 223 5 305 20.6 224 5 315 20.1 225 5 325 16.3 226 5 335 22.7 227 5 345 27.4 228 5 355 23.3 229 -5 5 16.6 230 -5 15 31.3 232 -5 35 15.2 233 -5 45 12.6 234 -5 55 16.4 235 -5 65 23.9 236 -5 75 24.0 237 -5 85 30.1 238 -5 95 28.3 239 -5 105 21.3 240 -5 115 15.9 241 -5 125 16.8 242 -5 135 20.3 243 -5 145 25.7 244 -5 155 23.4 245 -5 165 21.7 246 -5 175 15.7 247 -5 185 14.7 248 -5 195 10.6 249 -5 205 9.3 250 -5 215 8.2 251 -5 225 7.7 252 -5 235 7.3 253 -5 245 9.7 254 -5 255 13.4 255 -5 265 15.8 256 -5 275 17.6 257 -5 285 24.4 260 -5 315 13.3 261 -5 325 12.1 262 -5 335 9.0 263 -5 345 10.1 264 -5 355 11.4 265 -15 5 14.9 266 -15 15 34.1 268 -15 35 8.0 269 -15 45 11.1 270 -15 55 13.1 271 -15 65 14.1 272 -15 75 16.9 273 -15 85 18.8 274 -15 95 20.0 275 -15 105 16.0 276 -15 115 9.5 277 -15 125 5.1 278 -15 135 11.2 279 -15 145 13.1 280 -15 155 15.8 281 -15 165 17.6 282 -15 175 16.8 283 -15 185 17.3 284 -15 195 16.4 285 -15 205 13.8 286 -15 215 11.1 287 -15 225 11.6 288 -15 235 10.9 289 -15 245 12.0 290 -15 255 15.2 291 -15 265 16.1 292 -15 275 15.1 293 -15 285 19.7 297 -15 325 14.3 298 -15 335 12.7 299 -15 345 14.5 300 -15 355 16.7 301 -25 5 12.2 302 -25 15 10.7 304 -25 35 8.0 305 -25 45 11.3 306 -25 55 13.0 307 -25 65 14.2 308 -25 75 13.4 309 -25 85 14.3 310 -25 95 16.1 311 -25 105 17.0 312 -25 115 11.8 315 -25 145 10.3 316 -25 155 11.3 317 -25 165 14.9 318 -25 175 18.1 319 -25 185 17.9 320 -25 195 19.8 321 -25 205 23.4 322 -25 215 17.7 323 -25 225 18.2 324 -25 235 16.5 325 -25 245 16.3 326 -25 255 15.9 327 -25 265 16.9 328 -25 275 11.7 329 -25 285 15.7 332 -25 315 19.4 333 -25 325 16.6 334 -25 335 16.7 335 -25 345 18.0 336 -25 355 17.3 337 -35 5 19.5 338 -35 15 11.7 339 -35 25 11.7 340 -35 35 10.5 341 -35 45 12.7 342 -35 55 15.0 343 -35 65 14.7 344 -35 75 13.8 345 -35 85 13.4 346 -35 95 14.3 347 -35 105 15.0 348 -35 115 16.7 349 -35 125 17.5 350 -35 135 17.8 351 -35 145 19.2 352 -35 155 15.1 353 -35 165 16.0 354 -35 175 16.6 355 -35 185 15.3 356 -35 195 15.2 357 -35 205 17.9 358 -35 215 17.7 359 -35 225 19.2 360 -35 235 19.7 361 -35 245 16.4 362 -35 255 14.6 363 -35 265 16.6 364 -35 275 10.9 365 -35 285 13.6 366 -35 295 14.4 367 -35 305 16.7 368 -35 315 19.0 369 -35 325 21.0 370 -35 335 20.6 371 -35 345 18.7 372 -35 355 19.8 373 -45 5 26.7 374 -45 15 19.5 375 -45 25 23.2 376 -45 35 13.7 377 -45 45 21.7 378 -45 55 22.4 379 -45 65 19.8 380 -45 75 15.4 381 -45 85 14.5 383 -45 105 19.6 384 -45 115 19.1 385 -45 125 19.4 386 -45 135 22.0 387 -45 145 18.2 388 -45 155 19.4 389 -45 165 17.2 390 -45 175 16.5 391 -45 185 13.1 392 -45 195 13.4 393 -45 205 14.6 394 -45 215 15.1 395 -45 225 10.5 396 -45 235 8.3 397 -45 245 7.1 398 -45 255 10.0 399 -45 265 8.7 400 -45 275 12.0 401 -45 285 13.2 402 -45 295 16.5 403 -45 305 19.2 404 -45 315 21.2 405 -45 325 20.1 406 -45 335 18.3 407 -45 345 16.9 408 -45 355 18.9 409 -55 10 10.0 410 -55 30 13.5 411 -55 50 11.4 412 -55 70 25.8 415 -55 130 21.1 416 -55 150 17.4 417 -55 170 20.7 419 -55 210 13.2 420 -55 230 14.1 421 -55 250 15.2 422 -55 270 11.6 423 -55 290 16.8 424 -55 310 26.1 425 -55 330 27.3 427 -65 10 6.4 429 -65 50 20.2 442 -65 310 27.5