Stratus Amount-When-Present (%) December, January, February (1954 - 1997) , Ship Observations Only Global Average: 83.6 Zonal Averages 17 zones Lat.N Average 85 88.0 75 89.5 65 85.4 55 90.0 45 88.9 35 84.7 25 82.0 15 77.6 5 80.5 -5 78.7 -15 79.8 -25 80.9 -35 85.5 -45 88.2 -55 90.5 -65 89.2 -75 86.9 Grid Box Averages 376 filled boxes Box # Lat.N Lon.E Average 2 85 180 88.0 4 75 20 88.4 5 75 60 91.9 8 75 180 87.0 12 75 340 88.7 13 65 10 84.4 14 65 30 85.2 15 65 50 87.6 21 65 170 96.9 22 65 190 95.4 23 65 210 87.2 27 65 290 93.1 29 65 330 77.4 30 65 350 81.3 31 55 10 86.1 32 55 30 89.2 38 55 150 91.7 39 55 170 92.7 40 55 190 91.6 41 55 210 91.2 42 55 230 91.8 46 55 310 88.8 47 55 330 87.5 48 55 350 86.7 49 45 5 79.1 50 45 15 79.9 51 45 25 87.3 52 45 35 89.5 53 45 45 79.8 54 45 55 79.0 62 45 135 85.1 63 45 145 89.2 64 45 155 89.9 65 45 165 88.6 66 45 175 89.5 67 45 185 89.0 68 45 195 89.2 69 45 205 90.4 70 45 215 89.8 71 45 225 90.4 72 45 235 90.3 77 45 285 88.3 78 45 295 88.9 79 45 305 90.0 80 45 315 89.0 81 45 325 87.5 82 45 335 86.9 83 45 345 86.6 84 45 355 86.4 85 35 5 77.5 86 35 15 78.3 87 35 25 78.0 88 35 35 76.4 90 35 55 65.9 96 35 115 84.1 97 35 125 83.8 98 35 135 85.5 99 35 145 86.7 100 35 155 86.6 101 35 165 85.2 102 35 175 86.1 103 35 185 86.2 104 35 195 86.5 105 35 205 86.2 106 35 215 86.7 107 35 225 86.0 108 35 235 85.4 109 35 245 74.7 112 35 275 80.5 113 35 285 85.1 114 35 295 85.9 115 35 305 83.6 116 35 315 81.9 117 35 325 82.2 118 35 335 82.0 119 35 345 80.9 120 35 355 78.7 124 25 35 64.8 125 25 45 75.5 126 25 55 70.3 127 25 65 56.4 131 25 105 94.9 132 25 115 88.3 133 25 125 88.5 134 25 135 85.2 135 25 145 84.9 136 25 155 83.2 137 25 165 82.1 138 25 175 82.4 139 25 185 81.8 140 25 195 81.4 141 25 205 81.5 142 25 215 82.8 143 25 225 83.5 144 25 235 85.3 145 25 245 73.5 146 25 255 67.9 147 25 265 82.8 148 25 275 78.6 149 25 285 78.1 150 25 295 77.2 151 25 305 78.5 152 25 315 78.4 153 25 325 76.1 154 25 335 73.5 155 25 345 69.7 160 15 35 67.7 161 15 45 68.8 162 15 55 65.9 163 15 65 61.6 164 15 75 54.3 165 15 85 67.7 166 15 95 61.2 167 15 105 88.4 168 15 115 77.9 169 15 125 82.7 170 15 135 83.4 171 15 145 80.3 172 15 155 79.3 173 15 165 77.5 174 15 175 78.9 175 15 185 77.2 176 15 195 75.7 177 15 205 77.5 178 15 215 81.8 179 15 225 84.1 180 15 235 82.9 181 15 245 80.2 182 15 255 66.6 183 15 265 54.7 184 15 275 73.3 185 15 285 69.0 186 15 295 70.4 187 15 305 74.2 188 15 315 73.3 189 15 325 76.8 190 15 335 70.5 191 15 345 68.3 193 5 5 68.0 197 5 45 67.2 198 5 55 75.2 199 5 65 74.6 200 5 75 70.9 201 5 85 76.0 202 5 95 75.7 203 5 105 78.1 204 5 115 79.1 205 5 125 81.4 206 5 135 79.7 207 5 145 80.8 208 5 155 82.9 209 5 165 81.6 210 5 175 79.8 211 5 185 83.2 212 5 195 79.6 213 5 205 84.4 214 5 215 85.5 215 5 225 84.2 216 5 235 84.7 217 5 245 83.7 218 5 255 85.3 219 5 265 82.1 220 5 275 77.9 221 5 285 76.3 223 5 305 74.4 224 5 315 79.0 225 5 325 82.3 226 5 335 78.5 227 5 345 73.4 228 5 355 69.1 229 -5 5 73.8 230 -5 15 72.5 233 -5 45 72.3 234 -5 55 77.3 235 -5 65 80.4 236 -5 75 80.5 237 -5 85 79.4 238 -5 95 79.6 239 -5 105 81.2 240 -5 115 78.2 241 -5 125 76.8 242 -5 135 74.6 243 -5 145 80.2 244 -5 155 81.7 245 -5 165 79.3 246 -5 175 80.5 247 -5 185 80.8 248 -5 195 80.1 249 -5 205 76.8 250 -5 215 72.6 252 -5 235 71.4 253 -5 245 81.3 254 -5 255 81.1 255 -5 265 83.9 256 -5 275 76.3 257 -5 285 64.0 260 -5 315 75.0 261 -5 325 71.6 262 -5 335 75.5 263 -5 345 80.7 264 -5 355 77.0 265 -15 5 85.3 266 -15 15 79.0 268 -15 35 77.3 269 -15 45 76.0 270 -15 55 75.5 271 -15 65 79.9 272 -15 75 82.4 273 -15 85 79.3 274 -15 95 78.4 275 -15 105 76.8 276 -15 115 79.3 277 -15 125 80.5 278 -15 135 81.6 279 -15 145 81.7 280 -15 155 80.2 281 -15 165 80.0 282 -15 175 78.3 283 -15 185 78.8 284 -15 195 82.9 285 -15 205 81.2 286 -15 215 76.8 287 -15 225 77.8 288 -15 235 78.7 289 -15 245 73.2 290 -15 255 80.1 291 -15 265 83.4 292 -15 275 84.0 293 -15 285 73.1 297 -15 325 75.6 298 -15 335 72.3 299 -15 345 81.9 300 -15 355 83.6 301 -25 5 85.5 302 -25 15 83.3 304 -25 35 80.9 305 -25 45 78.6 306 -25 55 80.6 307 -25 65 77.6 308 -25 75 78.1 309 -25 85 82.5 310 -25 95 80.7 311 -25 105 81.2 312 -25 115 68.0 315 -25 145 78.3 316 -25 155 82.8 317 -25 165 80.8 318 -25 175 80.7 319 -25 185 82.2 320 -25 195 83.4 321 -25 205 86.7 322 -25 215 84.4 323 -25 225 85.0 324 -25 235 81.7 325 -25 245 78.2 326 -25 255 70.7 327 -25 265 76.7 328 -25 275 80.1 329 -25 285 83.3 332 -25 315 73.8 333 -25 325 77.2 334 -25 335 79.2 335 -25 345 78.2 336 -25 355 80.3 337 -35 5 84.5 338 -35 15 78.5 339 -35 25 81.5 340 -35 35 83.7 341 -35 45 84.6 342 -35 55 85.3 343 -35 65 86.5 344 -35 75 86.8 345 -35 85 85.2 346 -35 95 85.9 347 -35 105 85.0 348 -35 115 79.7 349 -35 125 82.9 350 -35 135 81.8 351 -35 145 82.9 352 -35 155 83.6 353 -35 165 86.1 354 -35 175 85.0 355 -35 185 85.3 356 -35 195 87.3 357 -35 205 88.3 358 -35 215 89.3 359 -35 225 89.4 360 -35 235 87.3 361 -35 245 88.2 362 -35 255 87.4 363 -35 265 88.7 364 -35 275 87.0 365 -35 285 87.3 367 -35 305 74.9 368 -35 315 80.3 369 -35 325 87.2 370 -35 335 84.9 371 -35 345 83.5 372 -35 355 84.1 373 -45 5 90.1 374 -45 15 88.4 375 -45 25 86.7 376 -45 35 90.8 377 -45 45 87.9 378 -45 55 88.2 379 -45 65 89.2 380 -45 75 87.2 381 -45 85 89.1 382 -45 95 88.6 383 -45 105 87.0 384 -45 115 88.6 385 -45 125 90.0 386 -45 135 85.9 387 -45 145 82.6 388 -45 155 87.7 389 -45 165 88.2 390 -45 175 84.2 391 -45 185 87.3 392 -45 195 89.7 393 -45 205 92.1 394 -45 215 90.4 395 -45 225 91.3 396 -45 235 85.3 397 -45 245 89.4 398 -45 255 87.0 399 -45 265 90.5 400 -45 275 89.4 401 -45 285 89.0 402 -45 295 75.7 403 -45 305 82.2 404 -45 315 84.3 405 -45 325 87.4 406 -45 335 88.5 407 -45 345 87.5 408 -45 355 88.8 409 -55 10 91.4 410 -55 30 91.1 411 -55 50 90.2 412 -55 70 88.6 413 -55 90 90.0 414 -55 110 89.1 415 -55 130 88.8 416 -55 150 91.4 417 -55 170 91.3 418 -55 190 89.0 419 -55 210 94.6 420 -55 230 91.5 421 -55 250 91.2 422 -55 270 92.8 423 -55 290 85.3 424 -55 310 88.0 425 -55 330 90.5 426 -55 350 90.2 427 -65 10 87.9 428 -65 30 73.6 429 -65 50 83.3 430 -65 70 89.2 431 -65 90 89.4 432 -65 110 88.3 433 -65 130 89.8 434 -65 150 90.5 435 -65 170 91.8 436 -65 190 90.1 437 -65 210 92.5 438 -65 230 93.0 439 -65 250 91.5 440 -65 270 91.7 441 -65 290 86.9 442 -65 310 89.8 443 -65 330 91.6 444 -65 350 87.2 449 -75 180 80.7 450 -75 220 94.1 451 -75 260 87.2 452 -75 300 81.4 453 -75 340 87.3