Stratus Amount-When-Present (%) March, April, May (1954 - 1997) Day, Ship Observations Only Global Average: 82.4 Zonal Averages 17 zones Lat.N Average 85 85.9 75 87.0 65 85.3 55 89.9 45 89.2 35 84.7 25 79.7 15 73.9 5 78.8 -5 78.0 -15 78.1 -25 79.8 -35 83.7 -45 87.8 -55 89.9 -65 90.7 -75 84.6 Grid Box Averages 379 filled boxes Box # Lat.N Lon.E Average 1 85 60 86.7 2 85 180 88.0 3 85 300 82.6 4 75 20 88.6 5 75 60 91.4 7 75 140 83.7 8 75 180 88.4 9 75 220 91.6 11 75 300 73.2 12 75 340 82.3 13 65 10 84.3 14 65 30 87.9 15 65 50 86.8 20 65 150 93.4 21 65 170 95.5 22 65 190 92.2 23 65 210 90.2 29 65 330 81.9 30 65 350 82.4 31 55 10 84.6 32 55 30 86.0 38 55 150 90.9 39 55 170 92.8 40 55 190 91.5 41 55 210 91.0 42 55 230 90.9 46 55 310 88.6 47 55 330 88.7 48 55 350 86.0 49 45 5 76.0 50 45 15 75.4 51 45 25 84.2 52 45 35 88.4 53 45 45 76.1 54 45 55 75.8 62 45 135 87.1 63 45 145 88.5 64 45 155 90.1 65 45 165 90.9 66 45 175 91.1 67 45 185 91.0 68 45 195 90.8 69 45 205 90.8 70 45 215 90.2 71 45 225 89.8 72 45 235 88.3 77 45 285 83.6 78 45 295 87.6 79 45 305 89.0 80 45 315 88.5 81 45 325 87.4 82 45 335 86.9 83 45 345 86.3 84 45 355 84.3 85 35 5 75.9 86 35 15 74.7 87 35 25 73.3 88 35 35 73.1 89 35 45 81.1 90 35 55 76.4 96 35 115 77.7 97 35 125 83.1 98 35 135 84.9 99 35 145 87.3 100 35 155 88.4 101 35 165 87.0 102 35 175 87.5 103 35 185 86.9 104 35 195 87.3 105 35 205 86.5 106 35 215 86.3 107 35 225 85.6 108 35 235 84.7 109 35 245 81.9 112 35 275 72.2 113 35 285 81.3 114 35 295 84.2 115 35 305 83.0 116 35 315 81.2 117 35 325 81.6 118 35 335 81.6 119 35 345 80.0 120 35 355 74.3 124 25 35 61.1 125 25 45 74.5 126 25 55 66.6 127 25 65 57.1 131 25 105 89.6 132 25 115 85.7 133 25 125 85.0 134 25 135 81.8 135 25 145 80.7 136 25 155 81.1 137 25 165 81.5 138 25 175 80.9 139 25 185 81.3 140 25 195 80.7 141 25 205 79.8 142 25 215 80.6 143 25 225 82.5 144 25 235 82.7 145 25 245 75.2 146 25 255 53.9 147 25 265 76.6 148 25 275 72.8 149 25 285 74.3 150 25 295 76.3 151 25 305 77.3 152 25 315 76.3 153 25 325 74.2 154 25 335 72.8 155 25 345 69.6 160 15 35 65.9 161 15 45 60.5 162 15 55 60.7 163 15 65 58.9 164 15 75 59.2 165 15 85 62.2 166 15 95 62.6 167 15 105 79.9 168 15 115 72.2 169 15 125 76.0 170 15 135 79.0 171 15 145 75.0 172 15 155 74.9 173 15 165 75.3 174 15 175 76.0 175 15 185 76.6 176 15 195 76.1 177 15 205 78.9 178 15 215 78.8 179 15 225 82.3 180 15 235 81.8 181 15 245 75.0 182 15 255 60.6 183 15 265 63.6 184 15 275 67.7 185 15 285 70.4 186 15 295 69.7 187 15 305 72.2 188 15 315 71.0 189 15 325 73.0 190 15 335 70.3 191 15 345 70.0 193 5 5 76.9 197 5 45 69.4 198 5 55 71.0 199 5 65 69.9 200 5 75 70.5 201 5 85 72.4 202 5 95 74.3 203 5 105 70.7 204 5 115 72.3 205 5 125 78.0 206 5 135 78.0 207 5 145 81.0 208 5 155 83.0 209 5 165 82.0 210 5 175 83.0 211 5 185 79.3 212 5 195 79.3 213 5 205 80.6 214 5 215 84.1 215 5 225 83.8 216 5 235 82.2 217 5 245 80.6 218 5 255 77.3 219 5 265 76.0 220 5 275 76.4 221 5 285 77.2 223 5 305 76.2 224 5 315 78.3 225 5 325 79.1 226 5 335 76.3 227 5 345 75.8 228 5 355 74.7 229 -5 5 73.5 230 -5 15 75.4 233 -5 45 72.1 234 -5 55 71.4 235 -5 65 80.2 236 -5 75 78.5 237 -5 85 77.9 238 -5 95 78.8 239 -5 105 76.3 240 -5 115 74.8 241 -5 125 76.2 242 -5 135 78.6 243 -5 145 78.8 244 -5 155 81.5 245 -5 165 79.8 246 -5 175 82.3 247 -5 185 80.9 248 -5 195 78.9 249 -5 205 78.6 250 -5 215 81.7 251 -5 225 78.0 252 -5 235 80.2 253 -5 245 80.4 254 -5 255 79.4 255 -5 265 82.1 256 -5 275 72.0 257 -5 285 76.1 260 -5 315 78.0 261 -5 325 76.6 262 -5 335 75.5 263 -5 345 70.6 264 -5 355 74.6 265 -15 5 82.8 266 -15 15 83.0 268 -15 35 71.0 269 -15 45 71.7 270 -15 55 73.7 271 -15 65 75.9 272 -15 75 75.1 273 -15 85 77.2 274 -15 95 78.8 275 -15 105 76.9 276 -15 115 74.2 277 -15 125 76.4 278 -15 135 78.6 279 -15 145 79.5 280 -15 155 80.5 281 -15 165 80.8 282 -15 175 79.0 283 -15 185 80.6 284 -15 195 81.0 285 -15 205 80.2 286 -15 215 77.9 287 -15 225 79.7 288 -15 235 77.7 289 -15 245 75.6 290 -15 255 72.9 292 -15 275 85.0 293 -15 285 77.4 297 -15 325 74.3 298 -15 335 67.7 299 -15 345 70.6 300 -15 355 78.1 301 -25 5 79.7 302 -25 15 82.1 304 -25 35 77.6 305 -25 45 76.1 306 -25 55 77.6 307 -25 65 80.0 308 -25 75 77.6 309 -25 85 78.5 310 -25 95 79.9 311 -25 105 78.5 312 -25 115 73.4 315 -25 145 77.4 316 -25 155 81.1 317 -25 165 80.1 318 -25 175 80.1 319 -25 185 81.9 320 -25 195 81.6 321 -25 205 82.6 322 -25 215 84.1 323 -25 225 82.8 324 -25 235 83.6 325 -25 245 78.5 326 -25 255 77.4 328 -25 275 82.2 329 -25 285 86.5 332 -25 315 71.6 333 -25 325 74.4 334 -25 335 74.8 335 -25 345 75.3 336 -25 355 76.3 337 -35 5 84.1 338 -35 15 78.1 339 -35 25 78.8 340 -35 35 79.2 341 -35 45 81.8 342 -35 55 82.8 343 -35 65 84.8 344 -35 75 85.6 345 -35 85 83.6 346 -35 95 83.9 347 -35 105 82.7 348 -35 115 79.2 349 -35 125 80.3 350 -35 135 80.8 351 -35 145 80.7 352 -35 155 81.6 353 -35 165 83.5 354 -35 175 82.8 355 -35 185 84.0 356 -35 195 84.1 357 -35 205 86.0 358 -35 215 85.6 359 -35 225 87.4 360 -35 235 86.8 361 -35 245 83.5 362 -35 255 85.1 363 -35 265 85.8 364 -35 275 87.2 365 -35 285 86.5 367 -35 305 77.2 368 -35 315 80.8 369 -35 325 83.5 370 -35 335 83.6 371 -35 345 83.2 372 -35 355 84.7 373 -45 5 90.0 374 -45 15 85.2 375 -45 25 87.1 376 -45 35 88.4 377 -45 45 86.8 378 -45 55 86.4 379 -45 65 88.4 380 -45 75 87.5 381 -45 85 89.2 382 -45 95 88.6 383 -45 105 90.1 384 -45 115 90.8 385 -45 125 87.8 386 -45 135 85.1 387 -45 145 82.7 388 -45 155 84.8 389 -45 165 87.5 390 -45 175 82.8 391 -45 185 86.1 392 -45 195 86.3 393 -45 205 88.0 394 -45 215 89.3 395 -45 225 87.9 396 -45 235 88.2 397 -45 245 91.8 398 -45 255 91.0 399 -45 265 88.8 400 -45 275 90.3 401 -45 285 87.5 402 -45 295 79.8 403 -45 305 82.9 404 -45 315 87.2 405 -45 325 88.1 406 -45 335 87.7 407 -45 345 88.1 408 -45 355 87.4 409 -55 10 92.5 410 -55 30 91.8 411 -55 50 87.8 412 -55 70 89.8 413 -55 90 90.3 414 -55 110 88.8 415 -55 130 91.6 416 -55 150 91.5 417 -55 170 89.3 418 -55 190 88.2 419 -55 210 94.6 420 -55 230 90.3 421 -55 250 91.8 422 -55 270 89.0 423 -55 290 85.0 424 -55 310 85.7 425 -55 330 86.0 426 -55 350 91.6 427 -65 10 89.8 428 -65 30 89.3 429 -65 50 88.2 430 -65 70 91.2 431 -65 90 95.1 432 -65 110 89.3 433 -65 130 91.9 434 -65 150 90.1 435 -65 170 89.1 436 -65 190 87.9 437 -65 210 92.0 438 -65 230 94.7 439 -65 250 94.4 440 -65 270 95.0 441 -65 290 86.6 442 -65 310 88.5 443 -65 330 92.9 444 -65 350 85.8 449 -75 180 85.2 450 -75 220 90.7 453 -75 340 73.7