Altocumulus Average Cloud Amount (%) July (1954 - 1997) Night, Ship Observations Only Global Average: 16.5 Zonal Averages 15 zones Lat.N Average 85 20.0 75 21.7 65 22.0 55 18.6 45 18.2 35 15.9 25 13.6 15 18.6 5 22.8 -5 16.3 -15 15.2 -25 14.8 -35 13.7 -45 12.6 -55 15.5 Grid Box Averages 314 filled boxes Box # Lat.N Lon.E Average 1 85 60 24.2 2 85 180 17.0 3 85 300 18.5 4 75 20 22.0 5 75 60 18.2 6 75 100 19.2 7 75 140 20.7 8 75 180 21.4 9 75 220 22.5 10 75 260 27.7 11 75 300 19.8 12 75 340 26.3 13 65 10 25.2 14 65 30 17.0 15 65 50 18.7 20 65 150 12.9 21 65 170 12.5 22 65 190 18.2 23 65 210 18.6 25 65 250 33.8 26 65 270 22.9 27 65 290 19.5 28 65 310 22.2 29 65 330 23.2 30 65 350 25.1 31 55 10 20.4 32 55 30 15.3 37 55 130 12.2 38 55 150 13.6 39 55 170 13.9 40 55 190 18.8 41 55 210 21.9 42 55 230 20.5 44 55 270 16.3 45 55 290 18.4 46 55 310 17.8 47 55 330 21.1 48 55 350 22.8 49 45 5 7.7 50 45 15 7.0 51 45 25 7.0 52 45 35 5.6 62 45 135 19.1 63 45 145 15.1 64 45 155 17.3 65 45 165 16.3 66 45 175 14.5 67 45 185 17.8 68 45 195 20.6 69 45 205 23.5 70 45 215 24.8 71 45 225 22.9 72 45 235 12.3 77 45 285 18.2 78 45 295 17.0 79 45 305 19.5 80 45 315 19.3 81 45 325 17.7 82 45 335 20.8 83 45 345 18.8 84 45 355 16.5 85 35 5 6.8 86 35 15 2.8 87 35 25 1.3 88 35 35 1.4 96 35 115 18.8 97 35 125 20.2 98 35 135 20.8 99 35 145 20.9 100 35 155 20.4 101 35 165 23.9 102 35 175 17.4 103 35 185 19.5 104 35 195 18.5 105 35 205 19.5 106 35 215 21.5 107 35 225 17.3 108 35 235 12.1 109 35 245 8.8 112 35 275 14.3 113 35 285 18.1 114 35 295 17.0 115 35 305 13.3 116 35 315 11.6 117 35 325 12.6 118 35 335 15.1 119 35 345 11.1 120 35 355 7.6 124 25 35 3.5 125 25 45 1.4 126 25 55 9.6 127 25 65 22.7 131 25 105 32.2 132 25 115 15.7 133 25 125 12.2 134 25 135 15.2 135 25 145 12.4 136 25 155 14.2 137 25 165 14.3 138 25 175 11.1 139 25 185 11.3 140 25 195 10.7 141 25 205 13.0 142 25 215 19.0 143 25 225 19.8 144 25 235 19.9 145 25 245 14.4 146 25 255 22.2 147 25 265 13.3 148 25 275 13.6 149 25 285 13.4 150 25 295 10.4 151 25 305 7.8 152 25 315 9.6 153 25 325 12.6 154 25 335 15.3 155 25 345 10.2 160 15 35 16.1 161 15 45 21.4 162 15 55 13.4 163 15 65 20.4 164 15 75 25.4 165 15 85 27.9 166 15 95 32.1 167 15 105 24.2 168 15 115 19.3 169 15 125 16.7 170 15 135 18.8 171 15 145 15.2 172 15 155 14.7 173 15 165 13.8 174 15 175 12.1 175 15 185 13.0 176 15 195 15.3 177 15 205 15.7 178 15 215 18.3 179 15 225 24.1 180 15 235 27.2 181 15 245 20.0 182 15 255 27.4 183 15 265 29.3 184 15 275 21.5 185 15 285 14.9 186 15 295 11.2 187 15 305 11.2 188 15 315 15.2 189 15 325 17.7 190 15 335 19.6 191 15 345 18.5 193 5 5 33.3 197 5 45 11.5 198 5 55 9.2 199 5 65 14.7 200 5 75 22.6 201 5 85 26.3 202 5 95 35.6 203 5 105 27.9 204 5 115 22.8 205 5 125 24.1 206 5 135 34.8 207 5 145 21.3 208 5 155 20.4 209 5 165 13.9 210 5 175 21.9 211 5 185 21.6 212 5 195 23.1 213 5 205 22.6 214 5 215 11.5 215 5 225 17.0 216 5 235 23.4 217 5 245 23.8 218 5 255 24.8 219 5 265 31.0 220 5 275 37.5 221 5 285 33.4 223 5 305 19.6 224 5 315 20.1 225 5 325 16.2 226 5 335 21.4 227 5 345 26.5 228 5 355 25.6 229 -5 5 18.4 230 -5 15 9.6 233 -5 45 12.3 234 -5 55 15.4 235 -5 65 22.4 236 -5 75 21.7 237 -5 85 25.2 238 -5 95 28.4 239 -5 105 17.6 240 -5 115 15.4 241 -5 125 19.7 242 -5 135 22.5 243 -5 145 27.6 244 -5 155 25.6 245 -5 165 22.0 246 -5 175 16.3 247 -5 185 14.4 248 -5 195 11.0 249 -5 205 7.0 250 -5 215 9.1 251 -5 225 7.5 252 -5 235 5.9 253 -5 245 9.1 254 -5 255 18.4 255 -5 265 22.0 256 -5 275 24.5 260 -5 315 15.4 261 -5 325 11.8 262 -5 335 10.5 263 -5 345 9.7 264 -5 355 11.5 265 -15 5 15.4 266 -15 15 34.6 268 -15 35 9.2 269 -15 45 11.8 270 -15 55 13.8 271 -15 65 13.9 272 -15 75 16.3 273 -15 85 17.1 274 -15 95 22.1 275 -15 105 15.6 276 -15 115 11.3 277 -15 125 3.7 278 -15 135 15.8 279 -15 145 15.2 280 -15 155 18.6 281 -15 165 20.4 282 -15 175 23.0 283 -15 185 17.0 284 -15 195 13.1 285 -15 205 12.1 286 -15 215 9.6 287 -15 225 11.4 288 -15 235 10.7 289 -15 245 12.3 290 -15 255 16.5 292 -15 275 18.2 293 -15 285 15.9 297 -15 325 14.7 298 -15 335 10.3 299 -15 345 17.9 300 -15 355 17.6 301 -25 5 11.2 302 -25 15 7.8 304 -25 35 7.1 305 -25 45 12.4 306 -25 55 12.7 307 -25 65 13.7 308 -25 75 9.1 309 -25 85 10.7 310 -25 95 15.2 311 -25 105 15.8 312 -25 115 10.3 316 -25 155 11.6 317 -25 165 14.2 318 -25 175 17.6 319 -25 185 17.6 320 -25 195 16.2 321 -25 205 21.6 322 -25 215 16.5 323 -25 225 16.0 324 -25 235 17.8 325 -25 245 19.3 328 -25 275 9.2 329 -25 285 12.8 332 -25 315 15.8 333 -25 325 18.8 334 -25 335 18.4 335 -25 345 14.8 336 -25 355 19.8 337 -35 5 17.8 338 -35 15 9.3 339 -35 25 7.6 340 -35 35 8.3 341 -35 45 11.4 342 -35 55 19.2 343 -35 65 15.5 344 -35 75 13.5 345 -35 85 11.6 346 -35 95 11.7 347 -35 105 11.2 348 -35 115 14.0 349 -35 125 16.1 350 -35 135 15.0 351 -35 145 14.4 352 -35 155 12.7 353 -35 165 13.4 354 -35 175 10.4 355 -35 185 11.7 356 -35 195 14.1 357 -35 205 15.3 358 -35 215 11.6 364 -35 275 6.9 365 -35 285 8.4 367 -35 305 14.3 368 -35 315 14.7 369 -35 325 23.2 370 -35 335 16.2 371 -35 345 20.2 372 -35 355 19.6 387 -45 145 17.1 388 -45 155 12.5 389 -45 165 15.4 390 -45 175 8.5 391 -45 185 9.0 400 -45 275 8.1 401 -45 285 12.2 402 -45 295 15.5 403 -45 305 15.7 404 -45 315 13.2 423 -55 290 14.9 424 -55 310 14.7 425 -55 330 16.9