The Central England Temperature series was originally constructed by the late Professor Gordon Manley, and is now routinely updated by the Hadley Centre. The monthly mean surface air temperatures, for a region representative of the English Midlands, are expressed in degrees Celsius for the period from 1659 to the present. The data are discussed in the following two papers: G. Manley, 'Central England Temperatures: monthly means 1659 to 1973', Quarterly Journal of the Royal Meteorological Society, 1974, vol. 100, pp. 389--405. and D.E. Parker, T.P. Legg and C.K. Folland, 'A new daily Central England Temperature series, 1772--1991', International Journal of Climatology, 1992, vol. 12, pp. 317--42. Listed below are the monthly CET values in degrees Celsius for 1990 to the present, together with the 1961-90 period normals and the 1990s decade anomalies. The 1990s decade was nearly 0.6degC warmer than the 1961-90 average. The full monthly series from 1659 is available from the Hadley Centre.
| J | F | M | A | M | J | J | A | S | O | N | D | ||
| 1990 | 6.5 | 7.3 | 8.3 | 8.0 | 12.6 | 13.6 | 16.9 | 18.0 | 13.2 | 11.9 | 6.9 | 4.3 | 10.63 |
| 1991 | 3.3 | 1.5 | 7.9 | 7.9 | 10.8 | 12.1 | 17.3 | 17.1 | 14.7 | 10.2 | 6.8 | 4.7 | 9.52 |
| 1992 | 3.7 | 5.4 | 7.5 | 8.7 | 13.6 | 15.7 | 16.2 | 15.3 | 13.4 | 7.8 | 7.4 | 3.6 | 9.86 |
| 1993 | 5.9 | 4.6 | 6.7 | 9.5 | 11.4 | 15.0 | 15.2 | 14.6 | 12.4 | 8.5 | 4.6 | 5.5 | 9.49 |
| 1994 | 5.3 | 3.2 | 7.7 | 8.1 | 10.7 | 14.5 | 18.0 | 16.0 | 12.7 | 10.2 | 10.1 | 6.4 | 10.24 |
| 1995 | 4.8 | 6.5 | 5.6 | 9.1 | 11.6 | 14.3 | 18.6 | 19.2 | 13.7 | 12.9 | 7.7 | 2.3 | 10.52 |
| 1996 | 4.3 | 2.5 | 4.5 | 8.5 | 9.1 | 14.4 | 16.5 | 16.5 | 13.6 | 11.7 | 5.9 | 2.9 | 9.20 |
| 1997 | 2.5 | 6.7 | 8.4 | 9.0 | 11.5 | 14.1 | 16.7 | 18.9 | 14.2 | 10.2 | 8.4 | 5.8 | 10.53 |
| 1998 | 5.2 | 7.3 | 7.9 | 7.7 | 13.1 | 14.2 | 15.5 | 15.9 | 14.9 | 10.6 | 6.2 | 5.5 | 10.34 |
| 1999 | 5.5 | 5.3 | 7.4 | 9.4 | 12.9 | 13.9 | 17.7 | 16.1 | 15.6 | 10.7 | 7.9 | 5.0 | 10.63 |
| 2000 | 4.9 | 6.3 | 7.6 | 7.8 | 12.1 | 15.1 | 15.5 | 16.6 | 14.7 | 10.3 | 7.0 | 5.8 | 10.30 |
| 2001 | 3.2 | 4.4 | 5.2 | 7.7 | 12.6 | 14.3 | 17.2 | 16.8 | 13.4 | 13.3 | 7.5 | 3.6 | 9.93 |
| 2002 | 5.5 | 7.0 | 7.6 | 9.3 | 11.8 | 14.4 | 16.0 | 17.0 | 14.4 | 10.1 | 8.5 | 5.7 | 10.60 |
| 2003 | 4.5 | 3.9 | 7.5 | 9.6 | 12.1 | 16.1 | 17.6 | 18.3 | 14.3 | 9.2 | |||
| 1961-90 average | 3.8 | 3.8 | 5.7 | 7.9 | 11.2 | 14.1 | 16.1 | 15.8 | 13.6 | 10.6 | 6.5 | 4.6 | 9.47 |
| 1991-99 anomaly | +0.7 | +1.0 | +1.4 | +0.8 | +0.4 | +0.2 | +0.7 | +0.9 | +0.3 | -0.3 | +0.7 | -0.0 | +0.57 |