Altocumulus Average Cloud Amount (%) August (1954 - 1997) Day, Ship Observations Only Global Average: 17.5 Zonal Averages 15 zones Lat.N Average 85 21.2 75 19.9 65 21.9 55 19.2 45 18.8 35 14.2 25 13.9 15 19.0 5 23.2 -5 16.1 -15 14.8 -25 15.8 -35 16.0 -45 16.6 -55 20.6 Grid Box Averages 343 filled boxes Box # Lat.N Lon.E Average 1 85 60 27.2 2 85 180 17.0 3 85 300 19.0 4 75 20 23.4 5 75 60 20.1 6 75 100 21.3 7 75 140 21.3 8 75 180 16.8 9 75 220 16.7 10 75 260 21.5 11 75 300 19.9 12 75 340 20.9 13 65 10 23.9 14 65 30 16.8 15 65 50 16.6 16 65 70 15.4 20 65 150 12.3 21 65 170 13.9 22 65 190 18.6 23 65 210 21.8 24 65 230 26.7 25 65 250 29.8 26 65 270 24.7 27 65 290 23.0 28 65 310 21.6 29 65 330 23.0 30 65 350 23.4 31 55 10 19.8 32 55 30 16.9 37 55 130 8.6 38 55 150 14.3 39 55 170 15.5 40 55 190 18.7 41 55 210 21.6 42 55 230 21.1 44 55 270 20.2 45 55 290 22.5 46 55 310 18.4 47 55 330 21.7 48 55 350 22.5 49 45 5 9.5 50 45 15 6.8 51 45 25 6.0 52 45 35 5.0 53 45 45 8.1 54 45 55 6.8 62 45 135 16.0 63 45 145 15.8 64 45 155 19.0 65 45 165 18.4 66 45 175 21.4 67 45 185 22.1 68 45 195 23.4 69 45 205 22.6 70 45 215 24.6 71 45 225 21.8 72 45 235 14.3 77 45 285 14.9 78 45 295 15.9 79 45 305 17.8 80 45 315 18.4 81 45 325 18.3 82 45 335 19.5 83 45 345 17.9 84 45 355 16.4 85 35 5 7.2 86 35 15 3.8 87 35 25 1.3 88 35 35 1.6 90 35 55 6.2 96 35 115 15.5 97 35 125 17.9 98 35 135 17.3 99 35 145 17.1 100 35 155 16.6 101 35 165 16.8 102 35 175 17.3 103 35 185 18.4 104 35 195 15.7 105 35 205 17.5 106 35 215 18.2 107 35 225 16.8 108 35 235 13.0 109 35 245 8.0 112 35 275 18.1 113 35 285 18.7 114 35 295 16.1 115 35 305 13.1 116 35 315 11.5 117 35 325 11.1 118 35 335 12.9 119 35 345 8.8 120 35 355 6.0 124 25 35 3.4 125 25 45 1.0 126 25 55 6.4 127 25 65 18.7 128 25 75 29.9 129 25 85 21.9 130 25 95 26.9 131 25 105 24.9 132 25 115 20.5 133 25 125 16.6 134 25 135 15.8 135 25 145 17.0 136 25 155 16.1 137 25 165 16.0 138 25 175 14.6 139 25 185 13.7 140 25 195 12.1 141 25 205 11.3 142 25 215 16.1 143 25 225 20.3 144 25 235 18.1 145 25 245 12.1 146 25 255 17.6 147 25 265 17.5 148 25 275 17.3 149 25 285 13.1 150 25 295 10.2 151 25 305 8.5 152 25 315 8.5 153 25 325 9.9 154 25 335 10.3 155 25 345 7.7 160 15 35 8.8 161 15 45 11.0 162 15 55 9.7 163 15 65 19.8 164 15 75 25.8 165 15 85 23.3 166 15 95 32.3 167 15 105 27.8 168 15 115 24.7 169 15 125 25.1 170 15 135 25.6 171 15 145 23.6 172 15 155 20.9 173 15 165 16.4 174 15 175 15.7 175 15 185 12.6 176 15 195 14.4 177 15 205 14.0 178 15 215 18.7 179 15 225 20.4 180 15 235 20.8 181 15 245 20.6 182 15 255 25.1 183 15 265 27.5 184 15 275 21.8 185 15 285 13.6 186 15 295 10.9 187 15 305 10.9 188 15 315 14.5 189 15 325 17.2 190 15 335 18.8 191 15 345 20.3 193 5 5 28.0 197 5 45 12.2 198 5 55 8.7 199 5 65 16.1 200 5 75 24.2 201 5 85 26.0 202 5 95 35.8 203 5 105 29.4 204 5 115 30.6 205 5 125 26.2 206 5 135 28.6 207 5 145 23.6 208 5 155 23.4 209 5 165 21.9 210 5 175 23.2 211 5 185 19.0 212 5 195 17.9 213 5 205 19.9 214 5 215 18.8 215 5 225 19.9 216 5 235 23.0 217 5 245 22.0 218 5 255 27.4 219 5 265 27.4 220 5 275 36.5 221 5 285 37.5 223 5 305 17.9 224 5 315 18.9 225 5 325 15.8 226 5 335 23.2 227 5 345 29.2 228 5 355 23.2 229 -5 5 20.9 230 -5 15 43.1 232 -5 35 15.4 233 -5 45 12.1 234 -5 55 16.9 235 -5 65 25.5 236 -5 75 24.5 237 -5 85 30.8 238 -5 95 27.9 239 -5 105 19.8 240 -5 115 13.4 241 -5 125 14.3 242 -5 135 20.1 243 -5 145 26.1 244 -5 155 24.2 245 -5 165 22.1 246 -5 175 13.3 247 -5 185 13.9 248 -5 195 8.9 249 -5 205 8.5 250 -5 215 7.3 251 -5 225 6.1 252 -5 235 8.8 253 -5 245 11.2 254 -5 255 15.1 255 -5 265 14.6 256 -5 275 15.9 260 -5 315 11.4 261 -5 325 10.1 262 -5 335 9.4 263 -5 345 12.4 264 -5 355 15.2 265 -15 5 20.4 266 -15 15 36.3 268 -15 35 6.2 269 -15 45 10.0 270 -15 55 13.4 271 -15 65 14.3 272 -15 75 17.4 273 -15 85 18.5 274 -15 95 19.6 275 -15 105 14.9 276 -15 115 7.0 277 -15 125 3.7 278 -15 135 9.9 279 -15 145 12.3 280 -15 155 14.7 281 -15 165 16.5 282 -15 175 14.9 283 -15 185 15.8 284 -15 195 16.9 285 -15 205 14.2 286 -15 215 10.6 287 -15 225 10.5 288 -15 235 11.1 289 -15 245 12.2 290 -15 255 15.3 291 -15 265 15.5 292 -15 275 13.9 293 -15 285 16.5 297 -15 325 13.4 298 -15 335 14.0 299 -15 345 17.1 300 -15 355 24.1 301 -25 5 13.8 302 -25 15 13.7 304 -25 35 8.1 305 -25 45 9.8 306 -25 55 12.7 307 -25 65 15.0 308 -25 75 13.6 309 -25 85 15.3 310 -25 95 16.1 311 -25 105 16.4 312 -25 115 10.3 315 -25 145 10.9 316 -25 155 10.0 317 -25 165 13.8 318 -25 175 16.5 319 -25 185 16.9 320 -25 195 20.0 321 -25 205 23.2 322 -25 215 15.7 323 -25 225 17.2 324 -25 235 16.5 325 -25 245 17.6 326 -25 255 18.9 327 -25 265 16.7 328 -25 275 11.1 329 -25 285 14.0 332 -25 315 19.0 333 -25 325 17.6 334 -25 335 17.1 335 -25 345 20.6 336 -25 355 17.5 337 -35 5 20.5 338 -35 15 11.7 339 -35 25 12.3 340 -35 35 11.7 341 -35 45 14.4 342 -35 55 15.2 343 -35 65 15.9 344 -35 75 14.0 345 -35 85 13.2 346 -35 95 15.5 347 -35 105 15.1 348 -35 115 16.1 349 -35 125 16.3 350 -35 135 17.2 351 -35 145 19.3 352 -35 155 13.7 353 -35 165 14.9 354 -35 175 16.6 355 -35 185 16.7 356 -35 195 15.4 357 -35 205 16.6 358 -35 215 18.8 359 -35 225 19.9 360 -35 235 17.1 364 -35 275 9.3 365 -35 285 14.0 367 -35 305 16.1 368 -35 315 18.7 369 -35 325 18.6 370 -35 335 19.0 371 -35 345 16.9 372 -35 355 21.1 377 -45 45 19.7 378 -45 55 21.9 379 -45 65 19.5 380 -45 75 16.5 386 -45 135 17.7 387 -45 145 20.2 388 -45 155 17.7 389 -45 165 15.7 390 -45 175 17.2 391 -45 185 12.5 392 -45 195 11.9 393 -45 205 13.0 394 -45 215 17.4 395 -45 225 8.2 400 -45 275 10.9 401 -45 285 19.9 402 -45 295 16.0 403 -45 305 19.2 404 -45 315 19.5 405 -45 325 20.5 408 -45 355 15.1 411 -55 50 13.2 412 -55 70 19.6 417 -55 170 18.3 423 -55 290 17.6 424 -55 310 27.1 425 -55 330 27.5