Last updated: April 17, 2025
Ilam Province in Iran displays a diverse climate characterized by Köppen-Geiger climate classes of Csa and BSh. The region experiences significant temperature variation, with a stark minimum of -18°C (0°F) in January, rising to an impressive maximum of 51°C (124°F) in July. The annual temperature average rests at a comfortable 19°C (66°F), highlighting the province's contrasting seasonal conditions. These climate patterns contribute to the unique ecological and agricultural landscapes of Ilam, shaping both its environmental dynamics and human activities.
Ilam Province, Iran, exhibits pronounced seasonal temperature patterns that reflect its diverse climate. In winter months, particularly January and February, temperatures plunge to their minima of -18°C (0°F) and -10°C (14°F), with average highs gradually increasing from 24°C (76°F) in January to 28°C (83°F) in February. As spring approaches, temperatures begin to rise significantly, peaking in March with a maximum of 38°C (101°F) and an average of 12°C (54°F). The warmth continues into the summer months, with July reaching a blistering maximum of 51°C (124°F) and an average of 32°C (90°F). Although temperatures slightly decline in late summer and fall, September and October still record warm averages of 28°C (82°F) and 21°C (69°F), before winter returns with lower averages and minima dropping back to -3°C (28°F) in November. This cyclical trend from sharp winter cold to scorching summer heat underscores the climatic extremes that define the province throughout the year.
Abdanan experiences a temperature range from a minimum of -6°C (22°F) in February to a maximum of 44°C (112°F) in July, while Darreh Shahr has similar extremes with a minimum of -6°C (21°F) in February and a maximum of 43°C (110°F) in July. In contrast, Ilam records an even lower minimum of -16°C (3°F) in January, but reaches up to 41°C (105°F) in July. For more detailed monthly temperatures, visit monthly temperatures in Abdanan, monthly temperatures in Darreh Shahr, and monthly temperatures in Ilam.
Precipitation in Ilam Province exhibits a distinct seasonal pattern, predominantly concentrated in the winter and early spring months. January leads the chart with 66 mm (2.6 in) of rainfall over approximately 7 days, followed closely by February and March, each receiving 99 mm (3.9 in) across 9 days. April sees a slight decrease with 88 mm (3.5 in) of rain, making these months critical for replenishing regional water sources before the onset of drier seasons. In stark contrast, summer months, particularly June and July, experience almost negligible precipitation, with 1 mm (0.0 in) recorded in June and 0 mm (0.0 in) in July and August, indicating a significant drop in moisture.
As autumn approaches, precipitation begins to re-emerge, albeit at lower volumes. October contributes 26 mm (1.0 in), while November and December return to higher levels with 74 mm (2.9 in) and 80 mm (3.1 in) respectively. These months see rainfall over about 7 days, allowing for some moisture replenishment. Overall, the precipitation regime in Ilam Province underscores a pronounced dry season during the summer months, interspersed with significant rainfall events during winter and spring, shaping the region's agricultural practices and ecological balance.
The humidity in Ilam Province exhibits distinct seasonal fluctuations, peaking during the winter months and reaching its lowest levels in summer. Starting the year at a relatively comfortable 52% in January, humidity gradually declines, dipping to a mere 14% in July and August, creating a dry, arid atmosphere. As the seasons shift, humidity levels rise again, climbing back to 50% in November and 57% in December, indicative of the province's wet winter climate. This cyclical trend highlights Ilam's transition from dry summer heat to the more humid and cooler conditions of winter, offering a unique weather pattern that supports a diverse range of activities throughout the year.
In Ilam Province, sunshine duration exhibits a pronounced seasonal trend, with an encouraging increase from winter to summer. January begins with 226 hours of sunshine, which gradually rises to 268 hours in February. The transition into spring witnesses a significant boost, as March and April record 326 hours and 337 hours, respectively. This upward trajectory culminates in May and June, where sunshine hours peak at 382 hours and 392 hours. Notably, July reaches an impressive 396 hours, marking the summer months as the brightest of the year, providing optimal conditions for agriculture and outdoor activities.
As summer transitions to autumn, the duration of sunshine starts to decline, yet remains substantial. August still offers a very respectable 376 hours of sunshine, but this begins to taper off as September and October see reductions to 342 hours and 319 hours. The decrease continues into November, with 276 hours, and December follows closely behind with 271 hours. This seasonal ebb in sunlight highlights the stark contrast between the sun-drenched days of summer and the shorter, cooler days of winter, ultimately influencing the region's climate, ecology, and agricultural practices throughout the year.
The UV Index in Ilam Province demonstrates significant seasonal variation, with the highest values occurring in the late spring and summer months. Starting the year, January records a moderate UV Index of 5, indicating a burn time of 30 minutes. As February approaches, the index rises to 6, categorized as high, with a shorter burn time of 25 minutes. The intensity of ultraviolet radiation surges dramatically from March onwards, reaching a notable 9 in March and peaking at 13 in May, categorized as extreme with a burn time of just 10 minutes. This intensity emphasizes the need for sun protection during these months as the potential for skin damage increases significantly.
As summer unfolds, UV levels remain dangerously high, with June, July, and August maintaining values between 11 and 12, all classified as extreme, warranting a mere 10 minutes of unprotected sun exposure. A slight drop in UV Index occurs in September, settling back to 10, but the danger remains at very high levels. By October, the index decreases to 7, and returns to high status, followed by a decline into the cooler months of November and December, where moderate UV levels of 5 and 4 are recorded, reflective of the reduced sun intensity. This progression underscores the importance of seasonal awareness regarding UV exposure, particularly between March and September, when protective measures become essential.
UV Risk Categories
In Ilam Province, daylight duration fluctuates throughout the year, reflecting the region's seasonal changes. January and February both offer 10 hours of daylight, indicating the shorter days typical of winter. As the spring months arrive, daylight begins to extend, with March providing 11 hours and continuing to increase as April and May both boast 13 hours. The peak occurs in June and July, where the province enjoys 14 hours of daylight, offering ample time for outdoor activities and agricultural practices under the sun's rays.
As summer transitions to autumn, the daylight duration gradually diminishes. In August, daylight remains steady at 13 hours, but this begins to reduce in September with 12 hours. October experiences a further decline to 11 hours, while November sees daylight dip back to 10 hours. December marks the shortest day of the year with only 9 hours of daylight. This cyclical shift emphasizes the influence of seasonal changes on daylight exposure, which in turn affects the region's climate, environment, and daily life.
Abdanan, Iran experiences a varied climate with cold winters and hot summers. January sees temperatures ranging from -4°C to 19°C, accompanied by significant precipitation peaking at 122 mm in February. As the year progresses, temperatures soar, reaching a maximum of 44°C in July and averaging around 30°C. Rainfall drops dramatically in the summer months, particularly in June, July, and August, which receive minimal to no precipitation. For more detailed information, visit Abdanan climate.
The climate in Arakvaz-e Malekshahi, Iran, features cold winters and hot summers, with January temperatures ranging from -17°C to 17°C and July temperatures reaching up to 41°C. The region experiences its highest precipitation from January to April, with February recording 120 mm, while summer months show minimal rainfall. Sunshine is abundant, particularly in the summer, with July receiving 397 hours of sunlight. Overall, the area exhibits significant temperature variations and seasonal precipitation, making it a unique climatic zone. For more details, visit Arakvaz-e Malekshahi climate.
Darreh Shahr, Iran experiences a continental climate with marked seasonal variations in temperature and precipitation. Winters are cold, with January temperatures averaging around 6°C (43°F), while summer months can be quite hot, reaching average highs of 31°C (88°F) in July. The region sees significant rainfall from January to April, with precipitation peaking in April at 100 mm (3.9 in), while the summer months are typically dry. Sunshine is abundant, especially from June to August, where residents enjoy nearly 400 hours of sunlight in July. For more detailed information, visit Darreh Shahr climate.
Dehloran, Iran experiences a hot desert climate characterized by hot summers and mild winters. January temperatures range from a minimum of -2°C to a maximum of 22°C, while July sees extremes from 24°C to 48°C. Precipitation is more prevalent in winter, with February receiving the most at 92 mm, contrasting sharply with the dry summer months of June and July. The region enjoys a high number of sunshine hours, peaking in July with 393 hours. For more detailed information, visit Dehloran climate.
The climate in Eyvan, Iran, is characterized by cold winters and hot summers. January temperatures range from a frigid -18°C to a mild 17°C, while July sees highs of up to 42°C. Precipitation is highest in early spring, peaking in March at 111 mm, before dropping significantly during the summer months when July and August receive virtually no rainfall. Eyvan enjoys abundant sunshine, especially from May to July, with the sun shining for nearly 400 hours each month. For more detailed information, visit Eyvan climate.
Ilam, Iran experiences a diverse climate with distinct seasonal variations. Winters are cold, with January temperatures plunging as low as -16°C (3°F), while the summer months reach highs of up to 41°C (105°F) in July. Precipitation is highest from January to April, peaking in March at 107 mm (4.2 in), with little to no rainfall during the summer. Sunshine is abundant, particularly in the summer, with July enjoying 397 hours of sun. For more details, visit Ilam climate.
Mehran, Iran experiences a diverse climate with hot summers and mild winters. Temperature extremes can reach up to 51°C (124°F) in July and dip to -3°C (27°F) in February. Most precipitation occurs in winter months, particularly in January and November, while summers typically see little to no rainfall. The region enjoys ample sunshine, with July offering the most hours at 394. For more detailed information, visit Mehran climate.
Sarableh, Iran, experiences a temperate climate with distinct seasons. Winter temperatures can plummet to -16°C (3°F) in January, while summers soar to a peak of 41°C (105°F) in July. The region sees the most precipitation from February to April, averaging over 100 mm (4 in) per month, and experiences minimal rainfall during the summer months. Sunshine hours are abundant, particularly from May to July, with the longest days offering nearly 400 hours of sunlight. For more details, visit Sarableh climate.
In conclusion, Ilam Province's climate, characterized by its diverse temperature ranges, varying precipitation patterns, significant sunshine duration, and shifting UV Index and daylight hours, presents a complex interplay of seasonal dynamics. The striking contrast between hot, dry summers and cooler, wetter winters shapes not only the region's ecology but also its agricultural practices and lifestyles. Understanding these climatic patterns is essential for residents and visitors alike, enabling them to adapt and make informed decisions regarding outdoor activities, sun protection, and agricultural planning. Overall, the climate of Ilam Province offers both challenges and opportunities, reflecting the intricate relationship between environment and human activity.