Stratocumulus Average Cloud Amount (%) March, April, May (1954 - 1997) Night, Ship Observations Only Global Average: 23.0 Zonal Averages 17 zones Lat.N Average 85 16.0 75 23.3 65 30.6 55 31.2 45 29.3 35 27.0 25 21.5 15 14.5 5 14.2 -5 12.0 -15 16.4 -25 21.3 -35 26.8 -45 32.5 -55 32.5 -65 37.6 -75 40.6 Grid Box Averages 388 filled boxes Box # Lat.N Lon.E Average 1 85 60 18.0 2 85 180 15.1 3 85 300 14.5 4 75 20 33.5 5 75 60 29.2 6 75 100 19.1 7 75 140 14.5 8 75 180 19.0 9 75 220 23.6 11 75 300 25.6 12 75 340 17.4 13 65 10 24.9 14 65 30 29.9 15 65 50 23.8 20 65 150 19.6 21 65 170 41.6 22 65 190 35.4 23 65 210 24.1 27 65 290 31.1 29 65 330 32.0 30 65 350 29.6 31 55 10 19.6 32 55 30 18.2 37 55 130 27.2 38 55 150 27.7 39 55 170 36.2 40 55 190 35.5 41 55 210 32.5 42 55 230 28.3 45 55 290 17.9 46 55 310 33.0 47 55 330 31.6 48 55 350 30.1 49 45 5 13.4 50 45 15 13.4 51 45 25 16.9 52 45 35 18.6 53 45 45 19.1 54 45 55 13.3 62 45 135 14.4 63 45 145 22.6 64 45 155 30.9 65 45 165 32.1 66 45 175 33.7 67 45 185 34.3 68 45 195 34.5 69 45 205 34.7 70 45 215 35.3 71 45 225 35.5 72 45 235 29.1 77 45 285 16.7 78 45 295 17.9 79 45 305 23.0 80 45 315 27.6 81 45 325 30.5 82 45 335 31.9 83 45 345 31.3 84 45 355 22.7 85 35 5 14.7 86 35 15 11.4 87 35 25 10.0 88 35 35 9.4 89 35 45 26.7 90 35 55 13.9 96 35 115 12.5 97 35 125 16.7 98 35 135 18.3 99 35 145 24.8 100 35 155 30.4 101 35 165 32.9 102 35 175 33.4 103 35 185 34.2 104 35 195 34.0 105 35 205 35.4 106 35 215 38.3 107 35 225 43.4 108 35 235 30.4 109 35 245 25.7 112 35 275 11.6 113 35 285 15.8 114 35 295 21.3 115 35 305 22.8 116 35 315 21.9 117 35 325 24.4 118 35 335 29.2 119 35 345 28.1 120 35 355 14.4 124 25 35 3.2 125 25 45 10.2 126 25 55 4.6 127 25 65 4.2 128 25 75 6.8 129 25 85 10.3 130 25 95 10.3 131 25 105 36.8 132 25 115 24.2 133 25 125 25.9 134 25 135 24.4 135 25 145 19.9 136 25 155 21.6 137 25 165 23.0 138 25 175 22.5 139 25 185 21.7 140 25 195 19.7 141 25 205 20.8 142 25 215 31.2 143 25 225 42.0 144 25 235 46.1 145 25 245 24.1 146 25 255 12.8 147 25 265 16.3 148 25 275 11.4 149 25 285 13.0 150 25 295 13.2 151 25 305 13.0 152 25 315 14.6 153 25 325 18.9 154 25 335 23.8 155 25 345 16.9 160 15 35 3.5 161 15 45 4.4 162 15 55 3.8 163 15 65 3.5 164 15 75 5.8 165 15 85 7.2 166 15 95 6.5 167 15 105 15.2 168 15 115 9.4 169 15 125 11.4 170 15 135 10.2 171 15 145 10.5 172 15 155 10.2 173 15 165 11.0 174 15 175 13.6 175 15 185 14.0 176 15 195 14.4 177 15 205 17.4 178 15 215 25.6 179 15 225 34.5 180 15 235 41.2 181 15 245 28.8 182 15 255 11.0 183 15 265 7.9 184 15 275 8.7 185 15 285 10.9 186 15 295 8.7 187 15 305 9.4 188 15 315 14.1 189 15 325 22.0 190 15 335 19.9 191 15 345 5.9 193 5 5 13.8 197 5 45 4.9 198 5 55 5.0 199 5 65 5.3 200 5 75 8.1 201 5 85 9.3 202 5 95 11.1 203 5 105 9.0 204 5 115 9.3 205 5 125 11.7 206 5 135 11.5 207 5 145 16.3 208 5 155 17.4 209 5 165 16.4 210 5 175 12.6 211 5 185 12.9 212 5 195 15.6 213 5 205 18.4 214 5 215 25.6 215 5 225 19.8 216 5 235 18.1 217 5 245 15.6 218 5 255 15.0 219 5 265 15.0 220 5 275 15.2 221 5 285 15.5 223 5 305 14.1 224 5 315 17.3 225 5 325 18.1 226 5 335 18.4 227 5 345 11.2 228 5 355 13.0 229 -5 5 19.3 230 -5 15 16.7 232 -5 35 9.8 233 -5 45 6.3 234 -5 55 7.0 235 -5 65 7.8 236 -5 75 9.0 237 -5 85 8.7 238 -5 95 12.2 239 -5 105 12.0 240 -5 115 10.3 241 -5 125 9.9 242 -5 135 10.8 243 -5 145 14.6 244 -5 155 16.6 245 -5 165 12.7 246 -5 175 9.8 247 -5 185 7.0 248 -5 195 9.4 249 -5 205 9.1 250 -5 215 9.4 251 -5 225 10.3 252 -5 235 9.2 253 -5 245 15.3 254 -5 255 16.6 255 -5 265 20.9 256 -5 275 22.6 257 -5 285 17.7 260 -5 315 13.5 261 -5 325 11.2 262 -5 335 11.1 263 -5 345 10.9 264 -5 355 17.6 265 -15 5 49.6 266 -15 15 32.5 268 -15 35 7.4 269 -15 45 6.7 270 -15 55 9.6 271 -15 65 10.4 272 -15 75 11.4 273 -15 85 12.9 274 -15 95 15.8 275 -15 105 13.0 276 -15 115 7.2 277 -15 125 7.1 278 -15 135 10.3 279 -15 145 14.9 280 -15 155 15.2 281 -15 165 14.6 282 -15 175 15.1 283 -15 185 13.0 284 -15 195 11.6 285 -15 205 10.0 286 -15 215 8.1 287 -15 225 8.4 288 -15 235 7.5 289 -15 245 11.2 290 -15 255 18.8 291 -15 265 36.2 292 -15 275 41.5 293 -15 285 30.0 297 -15 325 8.8 298 -15 335 10.0 299 -15 345 15.0 300 -15 355 36.9 301 -25 5 45.7 302 -25 15 24.2 304 -25 35 8.8 305 -25 45 12.0 306 -25 55 13.9 307 -25 65 19.9 308 -25 75 20.6 309 -25 85 25.7 310 -25 95 26.3 311 -25 105 24.5 312 -25 115 11.8 315 -25 145 13.1 316 -25 155 12.6 317 -25 165 17.0 318 -25 175 18.8 319 -25 185 19.7 320 -25 195 19.5 321 -25 205 18.5 322 -25 215 18.0 323 -25 225 17.2 324 -25 235 12.8 325 -25 245 14.6 326 -25 255 14.7 327 -25 265 28.5 328 -25 275 42.4 329 -25 285 48.4 332 -25 315 13.6 333 -25 325 13.3 334 -25 335 15.9 335 -25 345 17.5 336 -25 355 29.0 337 -35 5 35.9 338 -35 15 20.9 339 -35 25 16.8 340 -35 35 16.2 341 -35 45 21.6 342 -35 55 27.5 343 -35 65 28.8 344 -35 75 30.8 345 -35 85 37.1 346 -35 95 38.1 347 -35 105 34.7 348 -35 115 23.4 349 -35 125 30.7 350 -35 135 30.5 351 -35 145 23.7 352 -35 155 18.4 353 -35 165 25.8 354 -35 175 20.8 355 -35 185 23.7 356 -35 195 24.1 357 -35 205 23.6 358 -35 215 30.7 359 -35 225 30.8 360 -35 235 23.7 361 -35 245 21.1 362 -35 255 33.4 363 -35 265 28.7 364 -35 275 37.1 365 -35 285 34.4 367 -35 305 15.5 368 -35 315 17.2 369 -35 325 21.7 370 -35 335 25.3 371 -35 345 25.5 372 -35 355 28.1 373 -45 5 36.4 374 -45 15 30.6 375 -45 25 33.6 376 -45 35 26.3 377 -45 45 29.1 378 -45 55 36.7 379 -45 65 38.8 380 -45 75 30.4 381 -45 85 42.0 382 -45 95 37.0 383 -45 105 31.1 384 -45 115 29.2 385 -45 125 38.8 386 -45 135 36.8 387 -45 145 27.3 388 -45 155 31.0 389 -45 165 35.3 390 -45 175 26.4 391 -45 185 33.0 392 -45 195 33.4 393 -45 205 33.7 394 -45 215 37.7 395 -45 225 32.9 396 -45 235 35.7 397 -45 245 34.9 398 -45 255 37.0 399 -45 265 33.5 400 -45 275 40.4 401 -45 285 38.9 402 -45 295 19.5 403 -45 305 24.6 404 -45 315 25.8 405 -45 325 26.4 406 -45 335 31.2 407 -45 345 22.0 408 -45 355 29.1 409 -55 10 31.2 410 -55 30 27.7 411 -55 50 30.0 412 -55 70 35.5 413 -55 90 35.9 414 -55 110 33.0 415 -55 130 34.7 416 -55 150 35.3 417 -55 170 44.8 418 -55 190 33.5 419 -55 210 40.0 420 -55 230 23.5 421 -55 250 27.2 422 -55 270 30.8 423 -55 290 30.4 424 -55 310 31.3 425 -55 330 30.3 426 -55 350 29.6 427 -65 10 32.4 428 -65 30 31.5 429 -65 50 30.6 430 -65 70 42.8 431 -65 90 44.7 432 -65 110 42.3 433 -65 130 32.0 434 -65 150 35.5 435 -65 170 38.0 436 -65 190 26.6 437 -65 210 34.0 438 -65 230 45.9 440 -65 270 43.9 441 -65 290 37.4 442 -65 310 35.8 443 -65 330 42.8 444 -65 350 43.8 449 -75 180 46.0 450 -75 220 43.9 453 -75 340 27.7