The following table shows the daily average maximum temperatures for the period 1961 - 1990. Note these are approximate values and the only way to do it properly is take the actual daily temperatures for the period between 1961 - 1990. The averages 1961 - 1990 are the world standard which is why I have decided to include them. You have to remember these figures are a meant as a rough daily guide although they shouldn't be far off. *Leap year included.
The Met Office and the World Meteorological Organisation (WMO) use the 1961 - 1990 as the standard. Although one could argue that the averages no longer apply it does provide a baseline to compare Global warming. Some will notice that average time of the year values quoted on TV or on the Hadley CET don't correlate. This because presenters and the Hadley CET page use the final monthly value as the average. One can argue whether this is correct or not however I feel my method is closer to actual averages on the day concerned
The data is derived from the Stevenson Screen and not from the Davis Weather station.
| Daily average minimum temperatures using the 1991 - 2020 Average | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | |
| 1 | 6.5 | 5.6 | 6.3 | 8.3 | 11.3 | 15.2 | 18.3 | 19.9 | 19.4 | 16.7 | 13.1 | 8.5 |
| 2 | 6.5 | 5.6 | 6.4 | 8.4 | 11.4 | 15.3 | 18.4 | 19.9 | 19.3 | 16.6 | 12.9 | 8.4 |
| 3 | 6.4 | 5.7 | 6.4 | 8.5 | 11.6 | 15.4 | 18.4 | 19.9 | 19.2 | 16.5 | 12.8 | 8.4 |
| 4 | 6.4 | 5.7 | 6.5 | 8.6 | 11.7 | 15.5 | 18.5 | 19.8 | 19.1 | 16.3 | 12.6 | 8.3 |
| 5 | 6.4 | 5.7 | 6.6 | 8.7 | 11.8 | 15.6 | 18.5 | 19.8 | 19.0 | 16.2 | 12.5 | 8.2 |
| 6 | 6.4 | 5.7 | 6.6 | 8.8 | 12.0 | 15.7 | 18.6 | 19.8 | 18.9 | 16.1 | 12.3 | 8.2 |
| 7 | 6.3 | 5.8 | 6.7 | 8.9 | 12.1 | 15.8 | 18.6 | 19.8 | 18.8 | 16.0 | 12.2 | 8.1 |
| 8 | 6.3 | 5.8 | 6.8 | 9.0 | 12.2 | 15.9 | 18.7 | 19.8 | 18.7 | 15.9 | 12.0 | 8.0 |
| 9 | 6.3 | 5.8 | 6.8 | 9.1 | 12.3 | 16.1 | 18.7 | 19.8 | 18.7 | 15.7 | 11.9 | 8.0 |
| 10 | 6.2 | 5.8 | 6.9 | 9.2 | 12.5 | 16.2 | 18.8 | 19.7 | 18.6 | 15.6 | 11.7 | 7.9 |
| 11 | 6.2 | 5.9 | 7.0 | 9.3 | 12.6 | 16.3 | 18.8 | 19.7 | 18.5 | 15.5 | 11.6 | 7.9 |
| 12 | 6.2 | 5.9 | 7.0 | 9.4 | 12.7 | 16.4 | 18.9 | 19.7 | 18.4 | 15.4 | 11.4 | 7.8 |
| 13 | 6.1 | 5.9 | 7.1 | 9.5 | 12.9 | 16.5 | 18.9 | 19.7 | 18.3 | 15.2 | 11.2 | 7.7 |
| 14 | 6.1 | 5.9 | 7.2 | 9.6 | 13.0 | 16.6 | 19.0 | 19.7 | 18.2 | 15.1 | 11.1 | 7.7 |
| 15 | 6.1 | 6.0 | 7.3 | 9.7 | 13.1 | 16.7 | 19.1 | 19.7 | 18.1 | 15.0 | 10.9 | 7.6 |
| 16 | 6.1 | 6.0 | 7.3 | 9.8 | 13.3 | 16.8 | 19.1 | 19.6 | 18.0 | 14.9 | 10.8 | 7.5 |
| 17 | 6.0 | 6.0 | 7.4 | 9.9 | 13.4 | 16.9 | 19.2 | 19.6 | 17.9 | 14.8 | 10.6 | 7.5 |
| 18 | 6.0 | 6.0 | 7.5 | 10.1 | 13.5 | 17.0 | 19.2 | 19.6 | 17.8 | 14.6 | 10.5 | 7.4 |
| 19 | 6.0 | 6.1 | 7.5 | 10.2 | 13.6 | 17.1 | 19.3 | 19.6 | 17.7 | 14.5 | 10.3 | 7.3 |
| 20 | 5.9 | 6.1 | 7.6 | 10.3 | 13.8 | 17.2 | 19.3 | 19.6 | 17.6 | 14.4 | 10.2 | 7.3 |
| 21 | 5.9 | 6.1 | 7.7 | 10.4 | 13.9 | 17.3 | 19.4 | 19.6 | 17.5 | 14.3 | 10.0 | 7.2 |
| 22 | 5.9 | 6.1 | 7.7 | 10.5 | 14.0 | 17.4 | 19.4 | 19.5 | 17.4 | 14.2 | 9.8 | 7.1 |
| 23 | 5.8 | 6.2 | 7.8 | 10.6 | 14.2 | 17.6 | 19.5 | 19.5 | 17.4 | 14.0 | 9.7 | 7.1 |
| 24 | 5.8 | 6.2 | 7.9 | 10.7 | 14.3 | 17.7 | 19.5 | 19.5 | 17.3 | 13.9 | 9.5 | 7.0 |
| 25 | 5.8 | 6.2 | 7.9 | 10.8 | 14.4 | 17.8 | 19.6 | 19.5 | 17.2 | 13.8 | 9.4 | 6.9 |
| 26 | 5.7 | 6.2 | 8.0 | 10.9 | 14.6 | 17.9 | 19.7 | 19.5 | 17.1 | 13.7 | 9.2 | 6.9 | 27 | 5.7 | 6.3 | 8.1 | 11.0 | 14.7 | 18.0 | 19.7 | 19.5 | 17.0 | 13.6 | 9.1 | 6.8 | 28 | 5.7 | 6.3 | 8.1 | 11.1 | 14.8 | 18.1 | 19.8 | 19.4 | 16.9 | 13.4 | 8.9 | 6.7 | 29 | 5.7 | 6.3* | 8.2 | 11.2 | 14.9 | 18.2 | 19.8 | 19.4 | 16.8 | 13.3 | 8.8 | 6.7 | 30 | 5.6 | - | 8.3 | 11.3 | 15.1 | 18.3 | 19.9 | 19.4 | 16.7 | 13.2 | 8.5 | 6.6 | 31 | 5.6 | - | 8.3 | - | 15.2 | - | 19.9 | 19.4 | - | 13.1 | - | 6.5 |