High Level (Cirriform) Amount-When-Present (%) December, January, February (1954 - 1997) Day, Ship Observations Only Global Average: 33.8 Zonal Averages 17 zones Lat.N Average 85 35.8 75 50.5 65 37.6 55 37.5 45 34.8 35 34.8 25 29.3 15 30.0 5 34.4 -5 33.0 -15 30.5 -25 29.4 -35 31.1 -45 37.1 -55 40.7 -65 38.7 -75 34.3 Grid Box Averages 361 filled boxes Box # Lat.N Lon.E Average 1 85 60 26.7 2 85 180 46.1 3 85 300 39.0 4 75 20 33.2 5 75 60 41.1 7 75 140 47.7 8 75 180 55.8 9 75 220 55.6 13 65 10 34.5 14 65 30 35.0 15 65 50 31.2 21 65 170 37.7 22 65 190 38.9 23 65 210 44.9 29 65 330 38.6 30 65 350 39.1 31 55 10 36.7 32 55 30 39.9 38 55 150 35.7 39 55 170 34.6 40 55 190 33.3 41 55 210 35.6 42 55 230 34.8 46 55 310 46.5 47 55 330 42.0 48 55 350 35.3 49 45 5 37.9 50 45 15 38.6 51 45 25 40.3 52 45 35 45.1 53 45 45 43.3 54 45 55 39.7 62 45 135 34.5 63 45 145 35.0 64 45 155 34.3 65 45 165 28.0 66 45 175 26.6 67 45 185 33.7 68 45 195 32.2 69 45 205 30.3 70 45 215 32.0 71 45 225 35.8 72 45 235 35.8 77 45 285 38.5 78 45 295 40.5 79 45 305 41.2 80 45 315 43.6 81 45 325 36.2 82 45 335 34.8 83 45 345 33.9 84 45 355 33.9 85 35 5 35.7 86 35 15 35.3 87 35 25 35.4 88 35 35 35.6 96 35 115 31.1 97 35 125 38.8 98 35 135 36.6 99 35 145 31.5 100 35 155 30.2 101 35 165 36.7 102 35 175 30.7 103 35 185 32.8 104 35 195 33.8 105 35 205 32.3 106 35 215 33.6 107 35 225 41.5 108 35 235 35.7 109 35 245 40.6 112 35 275 42.9 113 35 285 36.7 114 35 295 36.4 115 35 305 34.9 116 35 315 37.2 117 35 325 33.6 118 35 335 34.3 119 35 345 33.1 120 35 355 32.6 124 25 35 32.5 125 25 45 33.0 126 25 55 33.1 127 25 65 30.9 128 25 75 37.4 129 25 85 26.7 132 25 115 35.0 133 25 125 29.5 134 25 135 23.9 135 25 145 23.0 136 25 155 25.0 137 25 165 24.3 138 25 175 25.6 139 25 185 27.1 140 25 195 28.5 141 25 205 30.3 142 25 215 32.3 143 25 225 33.4 144 25 235 31.6 145 25 245 33.5 146 25 255 33.2 147 25 265 32.2 148 25 275 29.1 149 25 285 27.3 150 25 295 27.4 151 25 305 27.1 152 25 315 28.1 153 25 325 29.8 154 25 335 30.6 155 25 345 34.5 160 15 35 29.5 161 15 45 31.9 162 15 55 27.4 163 15 65 27.9 164 15 75 31.4 165 15 85 28.3 166 15 95 31.2 167 15 105 37.6 168 15 115 30.2 169 15 125 29.9 170 15 135 28.4 171 15 145 27.4 172 15 155 31.7 173 15 165 33.6 174 15 175 30.8 175 15 185 31.8 176 15 195 29.7 177 15 205 27.9 178 15 215 30.9 179 15 225 29.6 180 15 235 30.0 181 15 245 29.9 182 15 255 27.6 183 15 265 24.9 184 15 275 25.2 185 15 285 27.7 186 15 295 26.4 187 15 305 26.4 188 15 315 27.7 189 15 325 33.0 190 15 335 39.5 191 15 345 42.0 193 5 5 51.2 197 5 45 27.9 198 5 55 27.8 199 5 65 29.1 200 5 75 32.6 201 5 85 32.9 202 5 95 36.5 203 5 105 38.4 204 5 115 35.8 205 5 125 33.6 206 5 135 37.0 207 5 145 31.8 208 5 155 35.1 209 5 165 44.0 210 5 175 39.5 211 5 185 35.0 212 5 195 35.7 213 5 205 33.2 214 5 215 28.9 215 5 225 23.7 216 5 235 22.2 217 5 245 31.4 218 5 255 27.6 219 5 265 25.3 220 5 275 28.1 221 5 285 33.3 223 5 305 31.6 224 5 315 33.3 225 5 325 35.6 226 5 335 41.3 227 5 345 47.1 228 5 355 47.0 229 -5 5 36.3 230 -5 15 37.6 232 -5 35 33.7 233 -5 45 28.4 234 -5 55 28.8 235 -5 65 27.6 236 -5 75 30.4 237 -5 85 31.7 238 -5 95 34.1 239 -5 105 40.9 240 -5 115 39.5 241 -5 125 38.0 242 -5 135 38.9 243 -5 145 37.4 244 -5 155 34.6 245 -5 165 42.3 246 -5 175 37.4 247 -5 185 32.4 248 -5 195 29.4 249 -5 205 27.6 250 -5 215 25.4 251 -5 225 24.9 252 -5 235 23.7 253 -5 245 24.7 254 -5 255 22.3 255 -5 265 25.3 256 -5 275 34.8 257 -5 285 35.1 260 -5 315 32.0 261 -5 325 28.4 262 -5 335 29.7 263 -5 345 31.0 264 -5 355 33.3 265 -15 5 27.6 266 -15 15 36.5 268 -15 35 30.0 269 -15 45 32.0 270 -15 55 30.4 271 -15 65 28.4 272 -15 75 28.9 273 -15 85 29.9 274 -15 95 29.9 275 -15 105 30.1 276 -15 115 31.5 277 -15 125 38.8 278 -15 135 36.9 279 -15 145 33.6 280 -15 155 30.3 281 -15 165 32.1 282 -15 175 31.2 283 -15 185 35.1 284 -15 195 33.0 285 -15 205 30.3 286 -15 215 27.4 287 -15 225 29.0 288 -15 235 26.5 289 -15 245 27.2 290 -15 255 28.5 291 -15 265 21.9 292 -15 275 30.3 293 -15 285 34.1 297 -15 325 28.9 298 -15 335 30.0 299 -15 345 27.4 300 -15 355 25.1 301 -25 5 25.3 302 -25 15 27.3 304 -25 35 27.5 305 -25 45 27.4 306 -25 55 28.1 307 -25 65 28.0 308 -25 75 29.3 309 -25 85 26.9 310 -25 95 25.7 311 -25 105 30.5 312 -25 115 29.3 315 -25 145 32.7 316 -25 155 27.5 317 -25 165 28.4 318 -25 175 30.3 319 -25 185 33.3 320 -25 195 32.1 321 -25 205 33.3 322 -25 215 34.3 323 -25 225 29.5 324 -25 235 29.6 325 -25 245 28.6 326 -25 255 27.6 328 -25 275 26.9 329 -25 285 31.2 332 -25 315 31.0 333 -25 325 30.7 334 -25 335 28.7 335 -25 345 25.3 336 -25 355 23.4 337 -35 5 25.5 338 -35 15 27.2 339 -35 25 27.5 340 -35 35 28.4 341 -35 45 28.1 342 -35 55 28.7 343 -35 65 28.3 344 -35 75 30.6 345 -35 85 29.5 346 -35 95 32.1 347 -35 105 29.4 348 -35 115 29.3 349 -35 125 32.2 350 -35 135 31.4 351 -35 145 30.4 352 -35 155 30.6 353 -35 165 30.8 354 -35 175 29.7 355 -35 185 33.7 356 -35 195 33.0 357 -35 205 31.2 358 -35 215 34.3 359 -35 225 35.0 360 -35 235 31.5 361 -35 245 34.1 363 -35 265 27.8 364 -35 275 32.7 365 -35 285 33.3 367 -35 305 31.1 368 -35 315 31.7 369 -35 325 36.6 370 -35 335 33.5 371 -35 345 32.2 372 -35 355 27.9 373 -45 5 43.4 374 -45 15 38.4 375 -45 25 44.4 376 -45 35 34.0 377 -45 45 34.3 378 -45 55 43.6 379 -45 65 40.0 380 -45 75 39.3 381 -45 85 36.7 382 -45 95 37.2 383 -45 105 40.1 384 -45 115 40.2 385 -45 125 38.7 386 -45 135 39.1 387 -45 145 34.6 388 -45 155 34.5 389 -45 165 36.1 390 -45 175 34.7 391 -45 185 35.2 392 -45 195 35.4 393 -45 205 33.2 394 -45 215 31.2 400 -45 275 35.0 401 -45 285 31.8 402 -45 295 33.6 403 -45 305 34.1 404 -45 315 33.0 405 -45 325 35.7 406 -45 335 37.5 407 -45 345 44.6 409 -55 10 38.7 410 -55 30 44.8 411 -55 50 40.6 412 -55 70 40.4 413 -55 90 46.9 414 -55 110 45.2 415 -55 130 37.0 416 -55 150 40.4 417 -55 170 39.5 422 -55 270 36.3 423 -55 290 38.0 424 -55 310 37.9 425 -55 330 38.2 426 -55 350 46.0 427 -65 10 39.2 428 -65 30 39.1 429 -65 50 40.0 430 -65 70 35.9 431 -65 90 36.9 432 -65 110 35.4 433 -65 130 39.7 434 -65 150 37.3 435 -65 170 39.3 437 -65 210 40.4 441 -65 290 40.6 442 -65 310 41.5 444 -65 350 33.9 449 -75 180 39.1 452 -75 300 31.1 453 -75 340 30.5