Stratocumulus Average Cloud Amount (%) May (1954 - 1997) Night, Ship Observations Only Global Average: 22.9 Zonal Averages 16 zones Lat.N Average 85 27.9 75 32.4 65 31.7 55 31.7 45 29.8 35 27.1 25 20.7 15 15.3 5 15.2 -5 12.2 -15 18.0 -25 22.4 -35 25.3 -45 30.7 -55 36.1 -65 24.6 Grid Box Averages 323 filled boxes Box # Lat.N Lon.E Average 1 85 60 34.5 2 85 180 29.7 3 85 300 15.9 4 75 20 36.9 5 75 60 37.2 6 75 100 32.3 7 75 140 23.4 8 75 180 31.0 9 75 220 37.0 11 75 300 28.8 12 75 340 26.4 13 65 10 25.4 14 65 30 33.3 15 65 50 28.7 20 65 150 19.3 21 65 170 42.7 22 65 190 39.4 23 65 210 25.3 28 65 310 29.3 29 65 330 32.6 30 65 350 29.8 31 55 10 18.4 32 55 30 16.5 37 55 130 25.5 38 55 150 27.3 39 55 170 37.6 40 55 190 36.3 41 55 210 32.6 42 55 230 29.4 46 55 310 33.2 47 55 330 32.0 48 55 350 29.6 49 45 5 11.3 50 45 15 10.8 51 45 25 14.1 52 45 35 13.0 53 45 45 18.1 54 45 55 9.6 62 45 135 17.7 63 45 145 22.6 64 45 155 29.1 65 45 165 32.0 66 45 175 35.1 67 45 185 37.3 68 45 195 36.8 69 45 205 35.3 70 45 215 37.6 71 45 225 40.2 72 45 235 30.9 77 45 285 15.3 78 45 295 16.0 79 45 305 20.2 80 45 315 26.2 81 45 325 32.1 82 45 335 32.5 83 45 345 30.5 84 45 355 21.7 85 35 5 13.2 86 35 15 9.1 87 35 25 7.7 88 35 35 6.6 97 35 125 14.9 98 35 135 17.2 99 35 145 22.9 100 35 155 30.3 101 35 165 33.6 102 35 175 33.9 103 35 185 35.3 104 35 195 33.6 105 35 205 35.6 106 35 215 40.2 107 35 225 46.7 108 35 235 34.9 109 35 245 33.6 112 35 275 8.9 113 35 285 13.9 114 35 295 19.2 115 35 305 21.3 116 35 315 21.4 117 35 325 23.7 118 35 335 30.4 119 35 345 29.8 120 35 355 14.4 124 25 35 2.3 125 25 45 8.2 126 25 55 2.4 127 25 65 4.0 129 25 85 17.1 132 25 115 20.5 133 25 125 23.0 134 25 135 21.4 135 25 145 18.5 136 25 155 19.1 137 25 165 19.4 138 25 175 20.2 139 25 185 17.9 140 25 195 17.0 141 25 205 18.6 142 25 215 29.7 143 25 225 44.3 144 25 235 52.8 145 25 245 32.2 146 25 255 14.8 147 25 265 12.6 148 25 275 8.6 149 25 285 12.4 150 25 295 12.8 151 25 305 12.2 152 25 315 12.5 153 25 325 16.5 154 25 335 26.4 155 25 345 19.5 160 15 35 1.7 161 15 45 3.3 162 15 55 4.2 163 15 65 4.8 164 15 75 9.1 165 15 85 10.4 166 15 95 10.1 167 15 105 10.1 168 15 115 9.1 169 15 125 9.9 170 15 135 6.0 171 15 145 7.8 172 15 155 8.9 173 15 165 10.3 174 15 175 12.6 175 15 185 13.6 176 15 195 16.3 177 15 205 16.6 178 15 215 27.9 179 15 225 36.6 180 15 235 45.5 181 15 245 31.6 182 15 255 12.8 183 15 265 10.6 184 15 275 10.5 185 15 285 12.9 186 15 295 9.8 187 15 305 9.9 188 15 315 15.4 189 15 325 25.6 190 15 335 22.9 191 15 345 7.7 193 5 5 13.9 197 5 45 6.9 198 5 55 6.6 199 5 65 7.8 200 5 75 10.1 201 5 85 11.3 202 5 95 13.3 203 5 105 9.7 204 5 115 9.5 205 5 125 11.7 206 5 135 10.7 207 5 145 16.1 208 5 155 17.4 209 5 165 13.9 210 5 175 16.4 211 5 185 12.2 212 5 195 16.7 213 5 205 19.7 214 5 215 18.9 215 5 225 17.0 216 5 235 16.4 217 5 245 24.2 218 5 255 19.6 219 5 265 21.2 220 5 275 20.7 221 5 285 19.5 223 5 305 15.9 224 5 315 17.1 225 5 325 16.3 226 5 335 19.1 227 5 345 13.8 228 5 355 15.1 229 -5 5 24.3 230 -5 15 17.6 233 -5 45 8.3 234 -5 55 8.4 235 -5 65 8.9 236 -5 75 10.5 237 -5 85 9.8 238 -5 95 11.5 239 -5 105 11.2 240 -5 115 8.9 241 -5 125 9.2 242 -5 135 12.4 243 -5 145 16.5 244 -5 155 16.0 245 -5 165 9.5 246 -5 175 8.0 247 -5 185 6.0 248 -5 195 8.9 249 -5 205 7.2 250 -5 215 4.8 251 -5 225 13.0 252 -5 235 9.1 253 -5 245 9.8 254 -5 255 16.2 255 -5 265 23.9 256 -5 275 29.1 260 -5 315 14.0 261 -5 325 11.3 262 -5 335 8.7 263 -5 345 10.5 264 -5 355 21.3 265 -15 5 48.0 266 -15 15 25.8 268 -15 35 5.8 269 -15 45 6.3 270 -15 55 10.8 271 -15 65 11.1 272 -15 75 12.1 273 -15 85 13.9 274 -15 95 16.4 275 -15 105 15.2 276 -15 115 8.6 277 -15 125 5.2 278 -15 135 11.1 279 -15 145 15.6 280 -15 155 18.0 281 -15 165 15.6 282 -15 175 17.8 283 -15 185 15.4 284 -15 195 13.6 285 -15 205 13.4 286 -15 215 8.8 287 -15 225 9.1 288 -15 235 9.5 289 -15 245 12.4 290 -15 255 20.5 291 -15 265 33.5 292 -15 275 51.9 293 -15 285 41.6 297 -15 325 9.3 298 -15 335 11.7 299 -15 345 16.9 300 -15 355 40.2 301 -25 5 41.1 302 -25 15 18.1 304 -25 35 7.7 305 -25 45 11.9 306 -25 55 13.9 307 -25 65 22.3 308 -25 75 25.6 309 -25 85 27.0 310 -25 95 25.5 311 -25 105 21.7 312 -25 115 13.0 316 -25 155 13.2 317 -25 165 17.5 318 -25 175 21.2 319 -25 185 23.0 320 -25 195 21.7 321 -25 205 20.6 322 -25 215 21.7 323 -25 225 22.4 324 -25 235 16.4 325 -25 245 15.9 326 -25 255 11.9 327 -25 265 34.8 328 -25 275 41.8 329 -25 285 46.2 332 -25 315 12.8 333 -25 325 15.7 334 -25 335 20.2 335 -25 345 19.5 336 -25 355 26.9 337 -35 5 33.1 338 -35 15 18.9 339 -35 25 15.7 340 -35 35 12.6 341 -35 45 21.9 342 -35 55 29.3 343 -35 65 31.2 344 -35 75 26.9 345 -35 85 33.4 346 -35 95 34.4 347 -35 105 30.6 348 -35 115 23.5 349 -35 125 25.7 350 -35 135 26.9 351 -35 145 22.4 352 -35 155 17.9 353 -35 165 25.0 354 -35 175 19.5 355 -35 185 21.4 356 -35 195 23.1 357 -35 205 19.9 358 -35 215 27.2 359 -35 225 32.7 360 -35 235 32.3 364 -35 275 30.5 365 -35 285 29.7 367 -35 305 17.2 368 -35 315 15.0 369 -35 325 22.2 370 -35 335 22.4 371 -35 345 28.8 372 -35 355 27.3 387 -45 145 26.0 388 -45 155 32.4 389 -45 165 34.4 390 -45 175 25.4 391 -45 185 32.6 392 -45 195 28.3 393 -45 205 28.8 397 -45 245 28.8 398 -45 255 37.5 399 -45 265 36.8 400 -45 275 40.2 401 -45 285 39.1 402 -45 295 21.6 403 -45 305 26.1 404 -45 315 21.8 405 -45 325 30.3 417 -55 170 48.1 422 -55 270 32.0 423 -55 290 32.9 424 -55 310 34.2 425 -55 330 32.5 442 -65 310 24.6