Altocumulus Average Cloud Amount (%) June, July, August (1954 - 1997) , Ship Observations Only Global Average: 17.0 Zonal Averages 17 zones Lat.N Average 85 18.1 75 19.5 65 21.3 55 18.9 45 18.5 35 15.7 25 13.7 15 18.1 5 23.5 -5 16.0 -15 15.0 -25 15.6 -35 15.3 -45 15.9 -55 16.7 -65 17.8 -75 9.9 Grid Box Averages 382 filled boxes Box # Lat.N Lon.E Average 1 85 60 23.1 2 85 180 14.9 3 85 300 15.7 4 75 20 22.3 5 75 60 19.0 6 75 100 19.9 7 75 140 17.9 8 75 180 17.4 9 75 220 18.3 10 75 260 22.3 11 75 300 20.1 12 75 340 21.7 13 65 10 23.4 14 65 30 16.6 15 65 50 16.5 16 65 70 12.9 20 65 150 12.9 21 65 170 13.0 22 65 190 18.0 23 65 210 21.0 24 65 230 26.7 25 65 250 27.3 26 65 270 23.3 27 65 290 21.3 28 65 310 21.6 29 65 330 22.7 30 65 350 23.5 31 55 10 19.5 32 55 30 15.9 37 55 130 9.2 38 55 150 14.0 39 55 170 15.0 40 55 190 19.0 41 55 210 21.4 42 55 230 21.3 44 55 270 18.3 45 55 290 21.8 46 55 310 18.0 47 55 330 21.6 48 55 350 22.2 49 45 5 9.8 50 45 15 8.1 51 45 25 7.7 52 45 35 6.6 53 45 45 8.5 54 45 55 7.8 61 45 125 10.2 62 45 135 15.9 63 45 145 14.6 64 45 155 17.2 65 45 165 16.9 66 45 175 18.7 67 45 185 21.2 68 45 195 21.8 69 45 205 23.1 70 45 215 24.1 71 45 225 22.0 72 45 235 13.9 77 45 285 15.7 78 45 295 16.4 79 45 305 18.4 80 45 315 18.6 81 45 325 18.8 82 45 335 20.5 83 45 345 18.3 84 45 355 16.7 85 35 5 8.1 86 35 15 4.7 87 35 25 2.3 88 35 35 2.0 89 35 45 13.4 90 35 55 11.4 96 35 115 15.0 97 35 125 19.6 98 35 135 19.8 99 35 145 19.2 100 35 155 18.5 101 35 165 20.4 102 35 175 18.4 103 35 185 19.8 104 35 195 18.8 105 35 205 19.5 106 35 215 19.9 107 35 225 16.9 108 35 235 11.7 109 35 245 7.5 112 35 275 16.4 113 35 285 18.4 114 35 295 16.9 115 35 305 14.0 116 35 315 12.8 117 35 325 13.3 118 35 335 15.2 119 35 345 10.9 120 35 355 7.6 124 25 35 3.2 125 25 45 3.1 126 25 55 6.6 127 25 65 16.0 128 25 75 21.0 129 25 85 24.3 130 25 95 29.7 131 25 105 21.1 132 25 115 18.8 133 25 125 16.3 134 25 135 17.1 135 25 145 15.0 136 25 155 14.8 137 25 165 14.3 138 25 175 13.3 139 25 185 11.6 140 25 195 11.0 141 25 205 12.0 142 25 215 16.8 143 25 225 20.2 144 25 235 17.9 145 25 245 12.3 146 25 255 16.6 147 25 265 14.0 148 25 275 15.5 149 25 285 14.8 150 25 295 11.9 151 25 305 9.4 152 25 315 9.6 153 25 325 11.2 154 25 335 11.2 155 25 345 8.7 156 25 355 6.2 160 15 35 11.0 161 15 45 13.5 162 15 55 10.9 163 15 65 18.8 164 15 75 25.7 165 15 85 24.8 166 15 95 32.2 167 15 105 25.9 168 15 115 21.2 169 15 125 19.2 170 15 135 19.4 171 15 145 16.8 172 15 155 15.2 173 15 165 12.8 174 15 175 13.0 175 15 185 13.6 176 15 195 13.6 177 15 205 14.8 178 15 215 17.6 179 15 225 21.1 180 15 235 23.4 181 15 245 20.1 182 15 255 25.2 183 15 265 29.5 184 15 275 22.8 185 15 285 15.0 186 15 295 11.6 187 15 305 11.6 188 15 315 14.8 189 15 325 17.5 190 15 335 18.1 191 15 345 17.6 193 5 5 30.6 197 5 45 11.3 198 5 55 9.2 199 5 65 16.3 200 5 75 24.3 201 5 85 25.9 202 5 95 35.8 203 5 105 28.3 204 5 115 26.3 205 5 125 26.6 206 5 135 33.6 207 5 145 22.3 208 5 155 21.6 209 5 165 20.3 210 5 175 23.6 211 5 185 22.6 212 5 195 21.4 213 5 205 20.2 214 5 215 18.4 215 5 225 18.3 216 5 235 20.6 217 5 245 22.3 218 5 255 26.1 219 5 265 29.9 220 5 275 37.7 221 5 285 36.3 222 5 295 20.5 223 5 305 20.1 224 5 315 20.8 225 5 325 17.5 226 5 335 23.3 227 5 345 27.0 228 5 355 24.9 229 -5 5 18.7 230 -5 15 22.8 232 -5 35 13.4 233 -5 45 12.2 234 -5 55 15.6 235 -5 65 22.4 236 -5 75 22.5 237 -5 85 28.0 238 -5 95 27.1 239 -5 105 21.1 240 -5 115 15.7 241 -5 125 17.2 242 -5 135 21.3 243 -5 145 25.8 244 -5 155 23.1 245 -5 165 21.1 246 -5 175 15.0 247 -5 185 14.6 248 -5 195 10.7 249 -5 205 8.3 250 -5 215 7.8 251 -5 225 7.5 252 -5 235 7.6 253 -5 245 9.9 254 -5 255 15.4 255 -5 265 18.7 256 -5 275 20.5 257 -5 285 20.9 260 -5 315 14.1 261 -5 325 12.0 262 -5 335 10.1 263 -5 345 10.3 264 -5 355 11.9 265 -15 5 15.7 266 -15 15 32.2 268 -15 35 8.1 269 -15 45 11.0 270 -15 55 13.9 271 -15 65 14.9 272 -15 75 17.2 273 -15 85 18.0 274 -15 95 20.5 275 -15 105 15.6 276 -15 115 9.4 277 -15 125 4.8 278 -15 135 11.8 279 -15 145 13.5 280 -15 155 16.7 281 -15 165 18.9 282 -15 175 18.7 283 -15 185 17.4 284 -15 195 15.0 285 -15 205 14.4 286 -15 215 11.3 287 -15 225 11.7 288 -15 235 10.7 289 -15 245 11.8 290 -15 255 14.9 291 -15 265 17.1 292 -15 275 16.0 293 -15 285 20.0 297 -15 325 14.1 298 -15 335 12.6 299 -15 345 16.3 300 -15 355 17.5 301 -25 5 12.3 302 -25 15 9.9 304 -25 35 7.5 305 -25 45 11.1 306 -25 55 13.1 307 -25 65 15.2 308 -25 75 14.3 309 -25 85 15.1 310 -25 95 16.0 311 -25 105 16.9 312 -25 115 11.2 315 -25 145 9.3 316 -25 155 11.4 317 -25 165 15.3 318 -25 175 18.2 319 -25 185 18.1 320 -25 195 18.5 321 -25 205 23.1 322 -25 215 16.9 323 -25 225 16.7 324 -25 235 15.5 325 -25 245 15.5 326 -25 255 16.0 327 -25 265 17.2 328 -25 275 11.0 329 -25 285 15.3 332 -25 315 18.3 333 -25 325 16.5 334 -25 335 16.7 335 -25 345 17.4 336 -25 355 18.1 337 -35 5 19.1 338 -35 15 11.1 339 -35 25 10.7 340 -35 35 9.8 341 -35 45 13.1 342 -35 55 15.8 343 -35 65 14.8 344 -35 75 14.3 345 -35 85 13.1 346 -35 95 13.3 347 -35 105 14.0 348 -35 115 15.1 349 -35 125 16.6 350 -35 135 16.8 351 -35 145 17.5 352 -35 155 14.1 353 -35 165 14.6 354 -35 175 14.3 355 -35 185 14.5 356 -35 195 14.7 357 -35 205 16.9 358 -35 215 15.9 359 -35 225 17.4 360 -35 235 20.2 361 -35 245 17.0 362 -35 255 15.9 363 -35 265 12.7 364 -35 275 9.2 365 -35 285 13.3 366 -35 295 12.9 367 -35 305 15.1 368 -35 315 17.1 369 -35 325 20.2 370 -35 335 17.7 371 -35 345 18.8 372 -35 355 20.1 373 -45 5 25.3 374 -45 15 21.2 375 -45 25 21.6 376 -45 35 16.6 377 -45 45 19.5 378 -45 55 22.7 379 -45 65 18.9 380 -45 75 15.9 381 -45 85 12.8 382 -45 95 17.3 383 -45 105 19.7 384 -45 115 18.8 385 -45 125 15.7 386 -45 135 18.2 387 -45 145 17.4 388 -45 155 17.6 389 -45 165 16.3 390 -45 175 14.5 391 -45 185 10.8 392 -45 195 16.9 393 -45 205 14.5 394 -45 215 14.6 395 -45 225 13.2 396 -45 235 9.3 397 -45 245 7.9 398 -45 255 7.2 399 -45 265 4.8 400 -45 275 10.8 401 -45 285 14.4 402 -45 295 15.1 403 -45 305 16.6 404 -45 315 16.3 405 -45 325 19.5 406 -45 335 18.6 407 -45 345 16.4 408 -45 355 16.0 409 -55 10 10.9 410 -55 30 11.8 411 -55 50 11.0 412 -55 70 29.3 415 -55 130 19.8 416 -55 150 17.4 417 -55 170 20.0 419 -55 210 14.3 420 -55 230 14.0 421 -55 250 16.2 422 -55 270 12.8 423 -55 290 14.5 424 -55 310 22.8 425 -55 330 21.4 426 -55 350 14.1 427 -65 10 9.5 429 -65 50 18.5 434 -65 150 16.6 442 -65 310 25.0 444 -65 350 19.8 450 -75 220 9.9