Stratocumulus Average Cloud Amount (%) September (1954 - 1997) Night, Ship Observations Only Global Average: 23.7 Zonal Averages 15 zones Lat.N Average 85 30.6 75 34.7 65 32.0 55 30.6 45 28.2 35 19.7 25 13.6 15 14.4 5 17.1 -5 17.9 -15 24.5 -25 27.8 -35 28.7 -45 27.8 -55 35.4 Grid Box Averages 324 filled boxes Box # Lat.N Lon.E Average 1 85 60 28.5 2 85 180 33.7 3 85 300 28.7 4 75 20 34.8 5 75 60 40.4 6 75 100 33.5 7 75 140 36.0 8 75 180 33.0 9 75 220 30.0 10 75 260 39.3 11 75 300 31.1 12 75 340 35.1 13 65 10 26.6 14 65 30 35.9 15 65 50 33.2 16 65 70 37.3 21 65 170 42.1 22 65 190 42.4 23 65 210 18.7 25 65 250 38.5 26 65 270 39.8 27 65 290 32.7 28 65 310 26.7 29 65 330 23.9 30 65 350 31.4 31 55 10 21.9 32 55 30 22.7 38 55 150 26.9 39 55 170 34.5 40 55 190 35.1 41 55 210 32.6 42 55 230 26.2 44 55 270 32.7 45 55 290 26.8 46 55 310 29.6 47 55 330 31.3 48 55 350 29.1 49 45 5 8.5 50 45 15 8.0 51 45 25 9.2 52 45 35 12.9 53 45 45 10.8 54 45 55 9.6 62 45 135 15.2 63 45 145 23.9 64 45 155 31.4 65 45 165 35.0 66 45 175 35.5 67 45 185 35.0 68 45 195 32.7 69 45 205 31.1 70 45 215 34.3 71 45 225 36.9 72 45 235 24.5 77 45 285 16.3 78 45 295 16.2 79 45 305 20.2 80 45 315 25.5 81 45 325 27.5 82 45 335 28.3 83 45 345 30.6 84 45 355 21.9 85 35 5 9.6 86 35 15 5.7 87 35 25 2.8 88 35 35 3.6 97 35 125 15.5 98 35 135 15.4 99 35 145 23.8 100 35 155 24.7 101 35 165 23.9 102 35 175 25.0 103 35 185 24.2 104 35 195 22.5 105 35 205 22.7 106 35 215 29.3 107 35 225 39.5 108 35 235 31.2 109 35 245 32.0 112 35 275 10.3 113 35 285 12.2 114 35 295 13.2 115 35 305 12.0 116 35 315 11.4 117 35 325 13.1 118 35 335 16.8 119 35 345 21.3 120 35 355 10.7 124 25 35 2.1 125 25 45 0.8 126 25 55 3.6 127 25 65 13.2 129 25 85 8.6 132 25 115 14.1 133 25 125 13.7 134 25 135 10.4 135 25 145 9.3 136 25 155 8.8 137 25 165 9.2 138 25 175 10.9 139 25 185 8.9 140 25 195 8.0 141 25 205 12.2 142 25 215 22.3 143 25 225 36.8 144 25 235 43.4 145 25 245 19.5 146 25 255 10.6 147 25 265 8.8 148 25 275 8.4 149 25 285 9.0 150 25 295 7.5 151 25 305 7.1 152 25 315 6.9 153 25 325 11.6 154 25 335 17.5 155 25 345 12.0 160 15 35 5.1 161 15 45 6.5 162 15 55 13.0 163 15 65 13.1 164 15 75 14.2 165 15 85 12.7 166 15 95 13.9 167 15 105 12.8 168 15 115 14.3 169 15 125 15.3 170 15 135 13.9 171 15 145 14.3 172 15 155 13.6 173 15 165 8.8 174 15 175 9.3 175 15 185 8.9 176 15 195 12.1 177 15 205 16.0 178 15 215 22.0 179 15 225 29.8 180 15 235 29.8 181 15 245 17.4 182 15 255 14.6 183 15 265 17.1 184 15 275 12.0 185 15 285 9.5 186 15 295 6.8 187 15 305 7.6 188 15 315 10.5 189 15 325 16.4 190 15 335 17.4 191 15 345 11.3 193 5 5 25.3 197 5 45 7.5 198 5 55 5.7 199 5 65 9.7 200 5 75 11.4 201 5 85 13.1 202 5 95 16.7 203 5 105 15.0 204 5 115 14.7 205 5 125 12.5 206 5 135 12.6 207 5 145 15.9 208 5 155 14.4 209 5 165 10.9 210 5 175 12.6 211 5 185 8.3 212 5 195 13.6 213 5 205 16.6 214 5 215 21.6 215 5 225 18.4 216 5 235 24.0 217 5 245 29.9 218 5 255 34.5 219 5 265 30.5 220 5 275 25.4 221 5 285 23.4 223 5 305 8.0 224 5 315 11.9 225 5 325 11.9 226 5 335 15.1 227 5 345 25.4 228 5 355 32.5 229 -5 5 46.7 230 -5 15 35.0 233 -5 45 9.0 234 -5 55 11.0 235 -5 65 14.2 236 -5 75 14.0 237 -5 85 15.9 238 -5 95 14.0 239 -5 105 13.5 240 -5 115 6.5 241 -5 125 6.5 242 -5 135 8.9 243 -5 145 13.5 244 -5 155 16.3 245 -5 165 10.7 246 -5 175 8.8 247 -5 185 6.0 248 -5 195 6.9 249 -5 205 7.7 250 -5 215 7.1 251 -5 225 7.4 252 -5 235 9.1 253 -5 245 19.7 254 -5 255 39.1 255 -5 265 49.3 256 -5 275 48.0 257 -5 285 47.3 260 -5 315 4.9 261 -5 325 7.7 262 -5 335 13.1 263 -5 345 26.2 264 -5 355 46.8 265 -15 5 67.5 266 -15 15 35.1 268 -15 35 8.2 269 -15 45 5.0 270 -15 55 14.8 271 -15 65 20.8 272 -15 75 23.3 273 -15 85 19.4 274 -15 95 19.1 275 -15 105 17.9 276 -15 115 5.3 277 -15 125 1.6 278 -15 135 3.9 279 -15 145 11.3 280 -15 155 14.7 281 -15 165 15.8 282 -15 175 18.7 283 -15 185 17.1 284 -15 195 15.1 285 -15 205 13.6 286 -15 215 12.5 287 -15 225 8.3 288 -15 235 10.8 289 -15 245 19.2 290 -15 255 34.4 291 -15 265 52.5 292 -15 275 66.8 293 -15 285 60.1 297 -15 325 11.5 298 -15 335 27.7 299 -15 345 39.1 300 -15 355 65.0 301 -25 5 53.8 302 -25 15 26.4 304 -25 35 15.4 305 -25 45 16.0 306 -25 55 17.6 307 -25 65 30.3 308 -25 75 32.0 309 -25 85 37.1 310 -25 95 33.5 311 -25 105 29.8 312 -25 115 10.7 315 -25 145 3.8 316 -25 155 9.7 317 -25 165 18.1 318 -25 175 22.9 319 -25 185 21.3 320 -25 195 21.9 321 -25 205 24.7 322 -25 215 21.7 323 -25 225 21.6 324 -25 235 20.8 325 -25 245 24.8 327 -25 265 40.6 328 -25 275 50.6 329 -25 285 47.8 332 -25 315 17.7 333 -25 325 19.4 334 -25 335 23.9 335 -25 345 28.6 336 -25 355 43.0 337 -35 5 40.1 338 -35 15 21.3 339 -35 25 18.6 340 -35 35 24.9 341 -35 45 28.2 342 -35 55 30.6 343 -35 65 30.3 344 -35 75 35.9 345 -35 85 41.5 346 -35 95 38.4 347 -35 105 39.7 348 -35 115 26.2 349 -35 125 24.1 350 -35 135 27.5 351 -35 145 22.2 352 -35 155 16.1 353 -35 165 21.5 354 -35 175 22.0 355 -35 185 24.4 356 -35 195 26.5 357 -35 205 32.4 358 -35 215 25.0 359 -35 225 22.6 360 -35 235 33.2 363 -35 265 34.3 364 -35 275 43.7 365 -35 285 29.7 367 -35 305 17.1 368 -35 315 21.5 369 -35 325 29.2 370 -35 335 25.2 371 -35 345 19.6 372 -35 355 34.3 387 -45 145 20.4 388 -45 155 20.8 389 -45 165 28.9 390 -45 175 27.9 391 -45 185 32.6 392 -45 195 25.0 400 -45 275 49.4 401 -45 285 26.9 402 -45 295 20.2 403 -45 305 25.0 404 -45 315 24.6 417 -55 170 50.1 422 -55 270 29.7 423 -55 290 30.6 424 -55 310 32.8 425 -55 330 32.9