Altocumulus Average Cloud Amount (%) July (1954 - 1997) Day, Ship Observations Only Global Average: 17.7 Zonal Averages 15 zones Lat.N Average 85 18.9 75 20.7 65 21.9 55 20.0 45 19.1 35 15.6 25 13.4 15 18.7 5 23.7 -5 16.2 -15 14.8 -25 15.5 -35 15.9 -45 16.1 -55 23.2 Grid Box Averages 345 filled boxes Box # Lat.N Lon.E Average 1 85 60 22.6 2 85 180 16.5 3 85 300 17.2 4 75 20 21.9 5 75 60 17.6 6 75 100 19.1 7 75 140 18.5 8 75 180 20.3 9 75 220 22.6 10 75 260 26.8 11 75 300 21.2 12 75 340 21.4 13 65 10 24.7 14 65 30 15.7 15 65 50 17.7 20 65 150 17.6 21 65 170 13.8 22 65 190 17.8 23 65 210 22.9 25 65 250 32.0 26 65 270 18.4 27 65 290 21.4 28 65 310 23.0 29 65 330 24.1 30 65 350 24.7 31 55 10 19.6 32 55 30 16.1 37 55 130 8.5 38 55 150 15.4 39 55 170 15.4 40 55 190 19.3 41 55 210 24.9 42 55 230 24.2 44 55 270 16.7 45 55 290 20.5 46 55 310 18.8 47 55 330 22.5 48 55 350 23.7 49 45 5 6.9 50 45 15 6.2 51 45 25 4.5 52 45 35 5.2 53 45 45 9.3 54 45 55 5.2 62 45 135 17.6 63 45 145 16.7 64 45 155 19.6 65 45 165 18.0 66 45 175 17.9 67 45 185 20.7 68 45 195 21.9 69 45 205 23.0 70 45 215 26.7 71 45 225 25.1 72 45 235 15.1 77 45 285 16.8 78 45 295 17.1 79 45 305 19.2 80 45 315 19.2 81 45 325 19.1 82 45 335 20.4 83 45 345 17.8 84 45 355 15.3 85 35 5 5.5 86 35 15 2.8 87 35 25 1.1 88 35 35 1.5 90 35 55 6.1 96 35 115 14.7 97 35 125 19.9 98 35 135 20.7 99 35 145 20.5 100 35 155 20.5 101 35 165 23.4 102 35 175 17.5 103 35 185 17.5 104 35 195 19.2 105 35 205 19.2 106 35 215 19.5 107 35 225 18.1 108 35 235 13.3 109 35 245 10.0 112 35 275 18.3 113 35 285 19.4 114 35 295 16.5 115 35 305 13.4 116 35 315 11.3 117 35 325 12.5 118 35 335 14.0 119 35 345 9.4 120 35 355 5.1 124 25 35 2.4 125 25 45 3.3 126 25 55 7.6 127 25 65 18.1 128 25 75 20.6 129 25 85 24.5 131 25 105 23.1 132 25 115 18.1 133 25 125 14.6 134 25 135 15.3 135 25 145 15.0 136 25 155 15.7 137 25 165 14.6 138 25 175 13.2 139 25 185 10.5 140 25 195 10.7 141 25 205 12.0 142 25 215 16.6 143 25 225 19.7 144 25 235 20.1 145 25 245 12.5 146 25 255 17.9 147 25 265 14.7 148 25 275 16.5 149 25 285 12.5 150 25 295 10.0 151 25 305 9.0 152 25 315 9.1 153 25 325 10.1 154 25 335 10.9 155 25 345 7.5 160 15 35 6.5 161 15 45 11.0 162 15 55 11.0 163 15 65 21.6 164 15 75 28.0 165 15 85 24.7 166 15 95 31.4 167 15 105 24.5 168 15 115 22.1 169 15 125 21.2 170 15 135 21.7 171 15 145 18.2 172 15 155 17.1 173 15 165 14.6 174 15 175 13.3 175 15 185 14.9 176 15 195 14.9 177 15 205 13.2 178 15 215 16.6 179 15 225 21.0 180 15 235 23.9 181 15 245 21.7 182 15 255 26.8 183 15 265 28.9 184 15 275 21.9 185 15 285 12.9 186 15 295 11.9 187 15 305 11.8 188 15 315 16.1 189 15 325 18.0 190 15 335 18.3 191 15 345 19.2 193 5 5 26.3 197 5 45 12.3 198 5 55 10.1 199 5 65 17.5 200 5 75 26.1 201 5 85 26.2 202 5 95 35.6 203 5 105 29.0 204 5 115 28.7 205 5 125 26.8 206 5 135 33.9 207 5 145 22.8 208 5 155 21.9 209 5 165 25.4 210 5 175 28.5 211 5 185 25.5 212 5 195 21.5 213 5 205 18.9 214 5 215 18.8 215 5 225 17.8 216 5 235 15.4 217 5 245 20.3 218 5 255 26.9 219 5 265 30.4 220 5 275 38.7 221 5 285 37.1 223 5 305 20.8 224 5 315 19.9 225 5 325 14.7 226 5 335 21.8 227 5 345 26.5 228 5 355 21.1 229 -5 5 15.8 230 -5 15 31.3 232 -5 35 15.1 233 -5 45 13.0 234 -5 55 16.4 235 -5 65 24.0 236 -5 75 25.5 237 -5 85 30.3 238 -5 95 29.3 239 -5 105 20.8 240 -5 115 16.3 241 -5 125 17.6 242 -5 135 20.3 243 -5 145 25.7 244 -5 155 24.1 245 -5 165 22.8 246 -5 175 17.8 247 -5 185 13.8 248 -5 195 11.0 249 -5 205 8.5 250 -5 215 8.0 251 -5 225 8.8 252 -5 235 6.6 253 -5 245 9.6 254 -5 255 14.1 255 -5 265 17.2 256 -5 275 17.8 257 -5 285 22.8 260 -5 315 12.9 261 -5 325 12.8 262 -5 335 8.3 263 -5 345 8.9 264 -5 355 10.4 265 -15 5 15.1 266 -15 15 38.3 268 -15 35 9.2 269 -15 45 12.4 270 -15 55 11.8 271 -15 65 14.7 272 -15 75 16.2 273 -15 85 19.9 274 -15 95 19.7 275 -15 105 15.0 276 -15 115 9.5 277 -15 125 5.0 278 -15 135 11.8 279 -15 145 13.4 280 -15 155 16.8 281 -15 165 18.4 282 -15 175 19.1 283 -15 185 17.9 284 -15 195 14.3 285 -15 205 12.1 286 -15 215 10.4 287 -15 225 10.8 288 -15 235 12.0 289 -15 245 12.7 290 -15 255 15.9 291 -15 265 17.9 292 -15 275 13.8 293 -15 285 19.2 297 -15 325 14.7 298 -15 335 12.8 299 -15 345 14.6 300 -15 355 15.5 301 -25 5 11.2 302 -25 15 9.3 304 -25 35 7.6 305 -25 45 13.0 306 -25 55 12.4 307 -25 65 13.7 308 -25 75 13.4 309 -25 85 12.5 310 -25 95 14.9 311 -25 105 17.7 312 -25 115 11.5 315 -25 145 8.4 316 -25 155 11.2 317 -25 165 14.8 318 -25 175 18.3 319 -25 185 16.5 320 -25 195 17.6 321 -25 205 22.8 322 -25 215 17.7 323 -25 225 17.1 324 -25 235 15.8 325 -25 245 17.2 326 -25 255 19.1 327 -25 265 18.3 328 -25 275 11.2 329 -25 285 13.2 332 -25 315 19.6 333 -25 325 16.9 334 -25 335 17.9 335 -25 345 17.3 336 -25 355 17.9 337 -35 5 18.8 338 -35 15 11.4 339 -35 25 10.3 340 -35 35 9.2 341 -35 45 11.2 342 -35 55 15.6 343 -35 65 14.9 344 -35 75 12.7 345 -35 85 13.4 346 -35 95 13.0 347 -35 105 14.4 348 -35 115 16.4 349 -35 125 17.3 350 -35 135 17.0 351 -35 145 19.0 352 -35 155 15.3 353 -35 165 16.0 354 -35 175 16.7 355 -35 185 14.6 356 -35 195 14.8 357 -35 205 17.8 358 -35 215 15.8 359 -35 225 23.3 360 -35 235 18.1 361 -35 245 16.0 362 -35 255 15.0 363 -35 265 18.1 364 -35 275 11.7 365 -35 285 12.2 367 -35 305 16.1 368 -35 315 19.8 369 -35 325 22.3 370 -35 335 21.7 371 -35 345 19.6 372 -35 355 18.7 377 -45 45 24.9 378 -45 55 25.9 379 -45 65 22.6 380 -45 75 14.8 386 -45 135 25.6 387 -45 145 18.4 388 -45 155 18.4 389 -45 165 16.2 390 -45 175 15.1 391 -45 185 11.3 392 -45 195 11.3 393 -45 205 11.9 394 -45 215 14.0 396 -45 235 4.4 397 -45 245 4.1 398 -45 255 7.0 400 -45 275 12.1 401 -45 285 10.8 402 -45 295 16.2 403 -45 305 19.7 404 -45 315 22.3 405 -45 325 17.7 406 -45 335 23.2 412 -55 70 21.3 417 -55 170 20.7 423 -55 290 17.4 424 -55 310 26.3 425 -55 330 29.0