Stratus Amount-When-Present (%) December, January, February (1954 - 1997) Night, Ship Observations Only Global Average: 84.3 Zonal Averages 17 zones Lat.N Average 85 89.7 75 90.6 65 84.8 55 90.6 45 89.5 35 85.5 25 83.0 15 78.6 5 81.4 -5 79.7 -15 80.6 -25 81.9 -35 85.6 -45 88.4 -55 90.6 -65 89.6 -75 86.9 Grid Box Averages 344 filled boxes Box # Lat.N Lon.E Average 2 85 180 89.7 4 75 20 88.2 5 75 60 93.7 13 65 10 84.0 14 65 30 85.2 21 65 170 98.0 22 65 190 95.5 23 65 210 85.5 29 65 330 78.5 30 65 350 81.3 31 55 10 86.7 32 55 30 88.8 38 55 150 93.4 39 55 170 93.4 40 55 190 91.8 41 55 210 91.4 42 55 230 92.3 46 55 310 89.4 47 55 330 88.0 48 55 350 87.2 49 45 5 79.5 50 45 15 80.8 51 45 25 88.2 52 45 35 90.3 62 45 135 83.7 63 45 145 90.2 64 45 155 90.5 65 45 165 89.1 66 45 175 90.0 67 45 185 89.3 68 45 195 89.3 69 45 205 90.8 70 45 215 90.2 71 45 225 91.3 72 45 235 91.4 77 45 285 89.3 78 45 295 90.1 79 45 305 91.0 80 45 315 89.7 81 45 325 88.1 82 45 335 88.0 83 45 345 87.6 84 45 355 87.2 85 35 5 78.3 86 35 15 79.6 87 35 25 79.0 88 35 35 78.9 97 35 125 84.8 98 35 135 85.6 99 35 145 87.0 100 35 155 87.0 101 35 165 86.1 102 35 175 87.1 103 35 185 86.6 104 35 195 87.7 105 35 205 86.3 106 35 215 87.5 107 35 225 86.8 108 35 235 86.9 109 35 245 76.1 112 35 275 80.1 113 35 285 85.5 114 35 295 86.6 115 35 305 84.4 116 35 315 83.0 117 35 325 82.9 118 35 335 83.4 119 35 345 82.0 120 35 355 80.2 124 25 35 66.3 126 25 55 71.3 127 25 65 58.0 132 25 115 89.0 133 25 125 89.2 134 25 135 85.5 135 25 145 85.8 136 25 155 84.9 137 25 165 83.1 138 25 175 83.9 139 25 185 82.0 140 25 195 82.1 141 25 205 82.7 142 25 215 84.0 143 25 225 85.9 144 25 235 86.9 145 25 245 75.7 146 25 255 68.2 147 25 265 82.9 148 25 275 77.7 149 25 285 78.8 150 25 295 78.8 151 25 305 80.2 152 25 315 80.1 153 25 325 76.6 154 25 335 74.9 155 25 345 71.2 161 15 45 70.2 162 15 55 67.9 163 15 65 64.8 164 15 75 60.1 165 15 85 68.5 166 15 95 60.9 167 15 105 89.2 168 15 115 78.3 169 15 125 83.2 170 15 135 83.7 171 15 145 81.6 172 15 155 80.8 173 15 165 78.9 174 15 175 80.9 175 15 185 77.7 176 15 195 74.4 177 15 205 78.4 178 15 215 83.5 179 15 225 85.6 180 15 235 83.5 181 15 245 80.6 182 15 255 67.1 183 15 265 54.9 184 15 275 73.8 185 15 285 70.3 186 15 295 71.9 187 15 305 76.4 188 15 315 72.4 189 15 325 78.9 190 15 335 70.0 191 15 345 71.4 193 5 5 66.3 198 5 55 76.3 199 5 65 77.0 200 5 75 73.4 201 5 85 76.3 202 5 95 76.2 203 5 105 78.3 204 5 115 79.0 205 5 125 82.1 206 5 135 82.0 207 5 145 81.2 208 5 155 84.1 209 5 165 84.8 210 5 175 82.0 211 5 185 83.3 212 5 195 78.0 213 5 205 85.4 214 5 215 85.7 215 5 225 85.5 216 5 235 85.6 217 5 245 86.2 218 5 255 88.2 219 5 265 83.3 220 5 275 78.5 221 5 285 72.5 223 5 305 75.3 224 5 315 79.7 225 5 325 84.3 226 5 335 78.8 227 5 345 73.5 228 5 355 68.2 229 -5 5 74.8 230 -5 15 69.0 233 -5 45 73.1 234 -5 55 79.8 235 -5 65 82.0 236 -5 75 82.0 237 -5 85 81.0 238 -5 95 78.8 239 -5 105 81.7 240 -5 115 77.5 241 -5 125 77.9 242 -5 135 71.8 243 -5 145 81.0 244 -5 155 82.3 245 -5 165 78.3 246 -5 175 80.6 247 -5 185 82.6 248 -5 195 77.1 254 -5 255 82.2 255 -5 265 85.7 256 -5 275 79.0 260 -5 315 75.5 261 -5 325 71.5 262 -5 335 76.5 263 -5 345 84.8 264 -5 355 79.4 265 -15 5 87.0 266 -15 15 78.3 268 -15 35 77.2 269 -15 45 74.7 270 -15 55 76.5 271 -15 65 81.3 272 -15 75 84.3 273 -15 85 79.2 274 -15 95 78.8 275 -15 105 75.9 276 -15 115 77.3 277 -15 125 81.8 278 -15 135 81.2 279 -15 145 81.6 280 -15 155 80.0 281 -15 165 79.4 282 -15 175 78.3 283 -15 185 78.4 284 -15 195 84.6 285 -15 205 80.5 286 -15 215 73.2 290 -15 255 83.8 291 -15 265 84.9 292 -15 275 86.0 293 -15 285 68.0 297 -15 325 75.1 299 -15 345 85.5 300 -15 355 85.2 301 -25 5 87.9 302 -25 15 82.5 304 -25 35 81.0 305 -25 45 79.4 306 -25 55 81.3 307 -25 65 79.5 308 -25 75 77.1 309 -25 85 84.6 310 -25 95 80.3 311 -25 105 81.3 312 -25 115 67.8 316 -25 155 84.1 317 -25 165 81.2 318 -25 175 80.8 319 -25 185 83.5 320 -25 195 83.5 321 -25 205 88.0 322 -25 215 83.7 323 -25 225 87.2 324 -25 235 81.5 328 -25 275 83.0 329 -25 285 81.0 332 -25 315 74.5 333 -25 325 76.1 334 -25 335 77.9 335 -25 345 79.6 336 -25 355 82.3 337 -35 5 85.8 338 -35 15 76.7 339 -35 25 80.5 340 -35 35 84.0 341 -35 45 84.7 342 -35 55 87.6 343 -35 65 86.5 344 -35 75 86.1 345 -35 85 86.5 346 -35 95 87.2 347 -35 105 84.5 348 -35 115 79.5 349 -35 125 83.9 350 -35 135 82.2 351 -35 145 84.8 352 -35 155 83.7 353 -35 165 86.5 354 -35 175 85.3 355 -35 185 84.4 356 -35 195 87.9 357 -35 205 88.7 358 -35 215 90.7 359 -35 225 89.9 363 -35 265 87.5 364 -35 275 87.9 365 -35 285 86.0 367 -35 305 73.8 368 -35 315 80.1 369 -35 325 88.3 370 -35 335 85.9 371 -35 345 82.1 372 -35 355 85.4 373 -45 5 91.0 374 -45 15 89.1 375 -45 25 85.9 376 -45 35 91.9 377 -45 45 88.1 378 -45 55 88.4 379 -45 65 89.5 380 -45 75 86.8 381 -45 85 89.0 382 -45 95 87.6 383 -45 105 84.9 384 -45 115 88.7 385 -45 125 91.0 386 -45 135 85.5 387 -45 145 84.3 388 -45 155 88.3 389 -45 165 88.5 390 -45 175 84.8 391 -45 185 87.2 392 -45 195 90.0 393 -45 205 92.0 394 -45 215 90.1 399 -45 265 92.4 400 -45 275 90.5 401 -45 285 88.8 402 -45 295 74.5 403 -45 305 82.3 404 -45 315 84.1 405 -45 325 86.9 406 -45 335 89.8 407 -45 345 86.4 408 -45 355 89.8 409 -55 10 91.7 410 -55 30 90.8 411 -55 50 90.7 412 -55 70 89.5 413 -55 90 91.0 414 -55 110 89.9 415 -55 130 89.0 416 -55 150 91.8 417 -55 170 91.4 418 -55 190 86.2 419 -55 210 92.9 420 -55 230 91.7 421 -55 250 90.7 422 -55 270 94.0 423 -55 290 85.8 424 -55 310 88.7 425 -55 330 90.8 426 -55 350 91.4 427 -65 10 88.0 428 -65 30 74.8 429 -65 50 83.3 430 -65 70 90.2 431 -65 90 89.2 432 -65 110 89.5 433 -65 130 90.4 434 -65 150 91.1 435 -65 170 92.5 436 -65 190 89.8 437 -65 210 92.7 438 -65 230 93.2 439 -65 250 91.4 440 -65 270 92.7 441 -65 290 88.3 442 -65 310 90.9 443 -65 330 91.2 444 -65 350 86.2 449 -75 180 80.0 450 -75 220 92.7 451 -75 260 87.5 452 -75 300 83.8 453 -75 340 88.1