Climate
Omdurman features a hot desert climate, with only the months of July and August seeing significant precipitation. Khartoum averages a little over 155 millimetres (6.1 in) of precipitation per year. Based on annual mean temperatures, Omdurman is one of the hottest major cities in the world. Temperatures may exceed 53 °C (127 °F) in mid-summer. Its average annual high temperature is 37.1 °C (99 °F), with six months of the year seeing an average monthly high temperature of at least 38 °C (100 °F). Furthermore, none of its monthly average high temperatures falls below 30 °C (86 °F). This is something not seen in other major cities with hot desert climates such as Riyadh, Baghdad and Phoenix. Temperatures cool off considerably during the night, with Khartoum's lowest average low temperatures of the year just above 15 °C (59 °F).
| Climate data for Omdurman | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average high °C (°F) | 30.8 (87.4) |
33.0 (91.4) |
36.8 (98.2) |
40.1 (104.2) |
41.9 (107.4) |
41.3 (106.3) |
38.4 (101.1) |
37.3 (99.1) |
39.1 (102.4) |
39.3 (102.7) |
35.2 (95.4) |
31.8 (89.2) |
37.1 (98.8) |
| Average low °C (°F) | 15.6 (60.1) |
17.0 (62.6) |
20.5 (68.9) |
23.6 (74.5) |
27.1 (80.8) |
27.3 (81.1) |
25.9 (78.6) |
25.3 (77.5) |
26.0 (78.8) |
25.5 (77.9) |
21.0 (69.8) |
17.1 (62.8) |
22.7 (72.9) |
| Precipitation mm (inches) | 0 (0) |
0 (0) |
0 (0) |
0 (0) |
.4 (0.016) |
4.0 (0.157) |
46.3 (1.823) |
75.2 (2.961) |
25.4 (1) |
4.8 (0.189) |
.7 (0.028) |
0 (0) |
156.8 (6.173) |
| % humidity | 27 | 22 | 17 | 16 | 19 | 28 | 43 | 49 | 40 | 28 | 27 | 30 | 28.8 |
| Avg. precipitation days (≥ 0.1 mm) | 0 | 0 | .1 | .1 | .9 | 1.2 | 4.8 | 4.8 | 3.2 | 1.2 | 0 | 0 | 16.3 |
| Mean monthly sunshine hours | 341 | 311 | 310 | 330 | 300 | 300 | 279 | 279 | 300 | 310 | 330 | 341 | 3,731 |
| Source #1: World Meteorological Organisation (UN) | |||||||||||||
| Source #2: BBC Weather | |||||||||||||
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—W.H. (Wystan Hugh)
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—Carol B. Hillman (20th century)