Altocumulus Average Cloud Amount (%) August (1954 - 1997) , Ship Observations Only Global Average: 17.0 Zonal Averages 15 zones Lat.N Average 85 20.0 75 19.2 65 21.3 55 18.5 45 18.5 35 14.0 25 13.7 15 18.4 5 23.4 -5 16.4 -15 15.3 -25 15.9 -35 15.3 -45 14.9 -55 18.6 Grid Box Averages 351 filled boxes Box # Lat.N Lon.E Average 1 85 60 25.5 2 85 180 15.7 3 85 300 18.5 4 75 20 22.7 5 75 60 19.7 6 75 100 19.3 7 75 140 19.3 8 75 180 15.7 9 75 220 16.8 10 75 260 21.6 11 75 300 19.8 12 75 340 21.1 13 65 10 23.4 14 65 30 16.9 15 65 50 16.0 16 65 70 13.3 20 65 150 11.8 21 65 170 13.1 22 65 190 19.2 23 65 210 20.8 24 65 230 24.7 25 65 250 26.8 26 65 270 23.9 27 65 290 22.0 28 65 310 21.2 29 65 330 21.6 30 65 350 23.3 31 55 10 20.0 32 55 30 16.6 37 55 130 9.4 38 55 150 14.0 39 55 170 14.4 40 55 190 17.8 41 55 210 20.3 42 55 230 19.7 44 55 270 19.8 45 55 290 23.4 46 55 310 18.0 47 55 330 21.1 48 55 350 22.1 49 45 5 9.9 50 45 15 6.9 51 45 25 5.8 52 45 35 5.5 53 45 45 7.3 54 45 55 5.6 62 45 135 16.2 63 45 145 15.2 64 45 155 18.3 65 45 165 17.9 66 45 175 21.0 67 45 185 23.4 68 45 195 22.9 69 45 205 22.9 70 45 215 24.2 71 45 225 20.3 72 45 235 13.2 77 45 285 14.8 78 45 295 15.9 79 45 305 17.6 80 45 315 17.2 81 45 325 18.0 82 45 335 19.2 83 45 345 17.7 84 45 355 16.9 85 35 5 7.7 86 35 15 3.8 87 35 25 1.3 88 35 35 1.5 90 35 55 7.6 96 35 115 15.1 97 35 125 16.9 98 35 135 16.7 99 35 145 17.8 100 35 155 16.7 101 35 165 16.4 102 35 175 16.9 103 35 185 17.9 104 35 195 15.8 105 35 205 17.5 106 35 215 18.0 107 35 225 16.5 108 35 235 12.4 109 35 245 7.4 112 35 275 16.0 113 35 285 18.2 114 35 295 15.8 115 35 305 12.2 116 35 315 11.2 117 35 325 10.9 118 35 335 13.0 119 35 345 9.5 120 35 355 6.9 124 25 35 4.6 125 25 45 1.5 126 25 55 7.6 127 25 65 20.8 128 25 75 28.3 129 25 85 23.5 130 25 95 31.0 131 25 105 23.6 132 25 115 18.3 133 25 125 15.4 134 25 135 15.3 135 25 145 16.6 136 25 155 15.5 137 25 165 14.2 138 25 175 14.2 139 25 185 12.8 140 25 195 12.1 141 25 205 11.8 142 25 215 15.9 143 25 225 20.7 144 25 235 17.8 145 25 245 12.3 146 25 255 17.3 147 25 265 16.1 148 25 275 15.9 149 25 285 13.3 150 25 295 9.9 151 25 305 7.8 152 25 315 8.5 153 25 325 10.2 154 25 335 10.3 155 25 345 8.7 160 15 35 15.6 161 15 45 15.9 162 15 55 10.5 163 15 65 20.4 164 15 75 26.1 165 15 85 23.6 166 15 95 32.2 167 15 105 28.7 168 15 115 22.2 169 15 125 21.9 170 15 135 23.3 171 15 145 22.0 172 15 155 18.9 173 15 165 13.2 174 15 175 14.4 175 15 185 13.2 176 15 195 12.7 177 15 205 15.1 178 15 215 18.5 179 15 225 20.0 180 15 235 20.0 181 15 245 18.8 182 15 255 25.2 183 15 265 27.7 184 15 275 21.6 185 15 285 14.0 186 15 295 10.6 187 15 305 10.8 188 15 315 14.1 189 15 325 16.7 190 15 335 19.0 191 15 345 20.7 193 5 5 31.3 197 5 45 11.1 198 5 55 8.1 199 5 65 14.1 200 5 75 22.7 201 5 85 25.6 202 5 95 36.4 203 5 105 28.3 204 5 115 27.4 205 5 125 26.7 206 5 135 29.0 207 5 145 22.8 208 5 155 22.3 209 5 165 20.7 210 5 175 20.3 211 5 185 20.2 212 5 195 18.0 213 5 205 19.9 214 5 215 20.4 215 5 225 20.9 216 5 235 23.8 217 5 245 25.8 218 5 255 26.5 219 5 265 29.4 220 5 275 37.1 221 5 285 36.3 223 5 305 18.2 224 5 315 19.8 225 5 325 17.7 226 5 335 24.6 227 5 345 29.2 228 5 355 25.0 229 -5 5 24.6 230 -5 15 33.0 232 -5 35 12.1 233 -5 45 11.2 234 -5 55 15.7 235 -5 65 23.1 236 -5 75 22.5 237 -5 85 29.5 238 -5 95 26.9 239 -5 105 20.7 240 -5 115 12.9 241 -5 125 14.9 242 -5 135 20.4 243 -5 145 26.1 244 -5 155 23.6 245 -5 165 24.1 246 -5 175 13.0 247 -5 185 13.3 248 -5 195 9.0 249 -5 205 9.4 250 -5 215 7.4 251 -5 225 6.6 252 -5 235 9.6 253 -5 245 11.6 254 -5 255 17.2 255 -5 265 19.6 256 -5 275 17.4 257 -5 285 19.6 260 -5 315 11.7 261 -5 325 10.1 262 -5 335 10.7 263 -5 345 12.6 264 -5 355 15.5 265 -15 5 22.5 266 -15 15 39.2 268 -15 35 6.0 269 -15 45 9.7 270 -15 55 15.5 271 -15 65 15.1 272 -15 75 18.3 273 -15 85 18.1 274 -15 95 20.2 275 -15 105 14.4 276 -15 115 6.5 277 -15 125 3.4 278 -15 135 10.1 279 -15 145 12.3 280 -15 155 15.6 281 -15 165 17.2 282 -15 175 16.1 283 -15 185 17.2 284 -15 195 15.5 285 -15 205 16.3 286 -15 215 11.4 287 -15 225 10.8 288 -15 235 10.2 289 -15 245 11.9 290 -15 255 15.8 291 -15 265 16.6 292 -15 275 13.0 293 -15 285 17.2 297 -15 325 13.0 298 -15 335 15.6 299 -15 345 19.5 300 -15 355 24.6 301 -25 5 14.1 302 -25 15 13.1 304 -25 35 7.3 305 -25 45 9.6 306 -25 55 13.5 307 -25 65 15.9 308 -25 75 16.4 309 -25 85 17.7 310 -25 95 16.9 311 -25 105 17.7 312 -25 115 9.4 315 -25 145 8.1 316 -25 155 10.1 317 -25 165 14.1 318 -25 175 16.7 319 -25 185 16.8 320 -25 195 19.6 321 -25 205 22.4 322 -25 215 15.1 323 -25 225 16.3 324 -25 235 16.1 325 -25 245 15.7 326 -25 255 19.8 327 -25 265 17.5 328 -25 275 9.5 329 -25 285 15.4 332 -25 315 18.4 333 -25 325 17.0 334 -25 335 16.6 335 -25 345 20.4 336 -25 355 18.5 337 -35 5 20.2 338 -35 15 10.9 339 -35 25 11.2 340 -35 35 10.6 341 -35 45 15.0 342 -35 55 15.6 343 -35 65 16.3 344 -35 75 16.1 345 -35 85 13.2 346 -35 95 14.4 347 -35 105 14.1 348 -35 115 14.8 349 -35 125 15.8 350 -35 135 16.5 351 -35 145 16.8 352 -35 155 13.5 353 -35 165 13.5 354 -35 175 14.7 355 -35 185 15.7 356 -35 195 14.1 357 -35 205 15.3 358 -35 215 16.8 359 -35 225 19.2 360 -35 235 18.9 361 -35 245 16.1 363 -35 265 13.7 364 -35 275 7.9 365 -35 285 14.4 367 -35 305 15.0 368 -35 315 18.1 369 -35 325 17.9 370 -35 335 16.4 371 -35 345 16.0 372 -35 355 19.4 377 -45 45 17.0 378 -45 55 25.0 379 -45 65 19.3 380 -45 75 15.4 385 -45 125 14.9 386 -45 135 18.8 387 -45 145 18.8 388 -45 155 17.0 389 -45 165 15.5 390 -45 175 16.1 391 -45 185 9.7 392 -45 195 13.3 393 -45 205 13.1 394 -45 215 15.8 395 -45 225 11.2 396 -45 235 11.8 397 -45 245 9.1 399 -45 265 4.2 400 -45 275 8.8 401 -45 285 17.6 402 -45 295 15.5 403 -45 305 16.9 404 -45 315 14.1 405 -45 325 19.4 408 -45 355 15.9 411 -55 50 13.2 412 -55 70 18.4 417 -55 170 19.3 422 -55 270 17.4 423 -55 290 14.7 424 -55 310 26.8 425 -55 330 19.8