Diamond Bar Weather
Change Location
Records and Averages
| Month | Avg. High | Avg. Low | Avg. Precip | Rec. High | Rec. Low |
|---|---|---|---|---|---|
| January | 20.0° C | 6.0° C | 10.21 cm | 33.0° C(01/31/2003) | -6.0° C (01/13/1963) |
| February | 21.0° C | 7.0° C | 10.29 cm | 34.0° C(02/04/1995) | -5.0° C (02/06/1989) |
| March | 21.0° C | 7.0° C | 8.76 cm | 38.0° C(03/26/1988) | -3.0° C (03/06/1948) |
| April | 23.0° C | 8.0° C | 1.85 cm | 40.0° C(04/07/1989) | -2.0° C (04/09/1953) |
| May | 25.0° C | 11.0° C | 0.64 cm | 41.0° C(05/29/1984) | 1.0° C (05/08/1950) |
| June | 28.0° C | 13.0° C | 0.13 cm | 41.0° C(06/29/1950) | 4.0° C (06/02/1953) |
| July | 32.0° C | 15.0° C | 0.00 cm | 44.0° C(07/27/1934) | 5.0° C (07/07/1948) |
| August | 32.0° C | 15.0° C | 0.33 cm | 43.0° C(08/29/1967) | 6.0° C (08/12/1950) |
| September | 31.0° C | 14.0° C | 0.74 cm | 45.0° C(09/10/1948) | 3.0° C (09/26/1948) |
| October | 27.0° C | 12.0° C | 1.68 cm | 42.0° C(10/12/1950) | -2.0° C (10/31/1935) |
| November | 23.0° C | 7.0° C | 3.28 cm | 36.0° C(11/04/1976) | -4.0° C (11/12/1938) |
| December | 20.0° C | 5.0° C | 5.18 cm | 34.0° C(12/04/1979) | -6.0° C (12/22/1990) |
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