Season-final Elo for all four rated units. These are the opponent-strength values every player performance against Northern Ill. is judged with.
| Season | Rush Offense | Pass Offense | Rush Defense | Pass Defense |
|---|---|---|---|---|
| 2026 | 1382 | 1006 | 1230 | 1328 |
| 2025 | 1390 | 1006 | 1236 | 1328 |
| 2024 | 1386 | 1098 | 1302 | 1327 |
| 2023 | 1372 | 1155 | 1216 | 1276 |
| 2022 | 1359 | 1136 | 1150 | 1150 |
| 2021 | 1354 | 1171 | 1150 | 1188 |
| 2020 | 1220 | 1196 | 1260 | 1192 |
| 2019 | 1271 | 1196 | 1310 | 1222 |
| 2018 | 1326 | 1142 | 1403 | 1234 |
| 2017 | 1378 | 1208 | 1318 | 1272 |
| 2016 | 1418 | 1228 | 1235 | 1254 |
| 2015 | 1386 | 1242 | 1256 | 1272 |
| 2014 | 1468 | 1243 | 1253 | 1228 |
| 2013 | 1476 | 1264 | 1276 | 1240 |
| 2012 | 1446 | 1270 | 1303 | 1260 |
| 2011 | 1415 | 1248 | 1260 | 1240 |
| 2010 | 1384 | 1198 | 1278 | 1272 |
| 2009 | 1318 | 1162 | 1236 | 1252 |
| 2008 | 1309 | 1168 | 1242 | 1260 |
| 2007 | 1316 | 1221 | 1205 | 1196 |
| 2006 | 1328 | 1234 | 1256 | 1208 |
| 2005 | 1351 | 1244 | 1233 | 1242 |
| 2004 | 1350 | 1238 | 1222 | 1196 |
| 2003 | 1306 | 1249 | 1260 | 1198 |
| 2002 | 1300 | 1224 | 1250 | 1200 |
| 2001 | 1254 | 1225 | 1222 | 1216 |
| 2000 | 1283 | 1230 | 1230 | 1236 |