Climate and average weather in Mahdishahr
In Mahdishahr, the summers are warm, fairly dry, and clear and the winters are very cold, snowy, and mostly clear.
Over the course of the year, the temperature in Mahdishahr typically varies from -5°C to 28°C, and is rarely below -10°C or above 33°C. July is the hottest month of the year, while January is the coldest.
Based on the travel score, the best time of year to visit Mahdishahr for warm-weather activities is from late May to mid October.
- Hottest
- Jul
- 28°
- Coldest
- Jan
- -5°
- Wettest
- Apr
- 59 mm
- Driest
- Aug
- 17 mm
- Rain / yr
- 387 mm
- 88 wet days
- Daylight
- 9.6–14.4 h
- shortest–longest
- Elevation
- 1,600 m
- 35.7°N
- Clearest
- Aug
- 21% cloud
Mahdishahr is city in Semnan Province, Iran.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Mahdishahr weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around late May to mid October.
Temperature through the year
Daily average highs and lows in Mahdishahr, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.2 months, from May 23 to September 27, with daily high temperatures above 21°C. The hottest month of the year in Mahdishahr is July, with an average high of 28°C and low of 18°C.
The cool season lasts 3.4 months, from November 26 to March 7, with daily high temperatures below 7°C. The coldest month of the year in Mahdishahr is January, with an average low of -5°C and high of 2°C.
Days typically run about 8°C warmer than nights, with the widest day–night swing (around 10°C) in June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 3 | 8 | 14 | 20 | 25 | 28 | 27 | 24 | 17 | 9 | 4 |
| Avg low (°C) | -5 | -4 | 1 | 6 | 11 | 15 | 18 | 17 | 14 | 8 | 2 | -3 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 2 | -5 |
| Feb | 3 | -4 |
| Mar | 8 | 1 |
| Apr | 14 | 6 |
| May | 20 | 11 |
| Jun | 25 | 15 |
| Jul | 28 | 18 |
| Aug | 27 | 17 |
| Sep | 24 | 14 |
| Oct | 17 | 8 |
| Nov | 9 | 2 |
| Dec | 4 | -3 |
How hot and cold Mahdishahr really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the coldest nights, wind chill pulls the feels-like down to about -7°C (around January 23), with roughly 121 freezing days a year (feels-like at or below 0°C), worst in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 2 | 3 | 8 | 14 | 20 | 25 | 28 | 27 | 24 | 17 | 9 | 4 |
| Air high (°C) | 2 | 3 | 8 | 14 | 20 | 25 | 28 | 27 | 24 | 17 | 9 | 4 |
| Feels-like low (°C) | -5 | -6 | -1 | 5 | 11 | 15 | 18 | 17 | 14 | 8 | 2 | -3 |
| Air low (°C) | -5 | -4 | 1 | 6 | 11 | 15 | 18 | 17 | 14 | 8 | 2 | -3 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 2 | 2 | -5 | -5 |
| Feb | 3 | 3 | -6 | -4 |
| Mar | 8 | 8 | -1 | 1 |
| Apr | 14 | 14 | 5 | 6 |
| May | 20 | 20 | 11 | 11 |
| Jun | 25 | 25 | 15 | 15 |
| Jul | 28 | 28 | 18 | 18 |
| Aug | 27 | 27 | 17 | 17 |
| Sep | 24 | 24 | 14 | 14 |
| Oct | 17 | 17 | 8 | 8 |
| Nov | 9 | 9 | 2 | 2 |
| Dec | 4 | 4 | -3 | -3 |
Average hourly temperature in Mahdishahr
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on July afternoons, near 28°C, and coldest before dawn in January, near -5°C.
Mahdishahr weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 2° / -5° | 24 | 5.9 | 6.5 | 9.9 | 0.0 |
| Feb | 3° / -4° | 31 | 6.9 | 6.6 | 10.6 | 0.0 |
| Mar | 8° / 1° | 50 | 9.2 | 7 | 11.7 | 1.5 |
| Apr | 14° / 6° | 59 | 10.7 | 2.7 | 12.9 | 4.3 |
| May | 20° / 11° | 57 | 12.2 | 0.3 | 13.9 | 6.2 |
| Jun | 25° / 15° | 28 | 7.9 | 0 | 14.4 | 7.5 |
| Jul | 28° / 18° | 19 | 5.1 | 0 | 14.2 | 7.5 |
| Aug | 27° / 17° | 17 | 4.9 | 0 | 13.3 | 7.9 |
| Sep | 24° / 14° | 22 | 5.8 | 0 | 12.2 | 8.1 |
| Oct | 17° / 8° | 29 | 7 | 0.6 | 11.1 | 6.3 |
| Nov | 9° / 2° | 30 | 6.9 | 4.3 | 10.1 | 2.2 |
| Dec | 4° / -3° | 23 | 5.9 | 5.8 | 9.6 | 0.0 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Mahdishahr gets about 387 mm of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.
The wetter season lasts 4.2 months, from around Feb 13 to Jun 21, peaking in May at about 41% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Aug 11.
April is the wettest month by volume, with 59 mm over about 11 wet days; August is the driest, with 17 mm. Some of the cold-season precipitation falls as snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 19 | 24 | 30 | 35 | 38 | 27 | 17 | 15 | 20 | 23 | 23 | 19 |
| Rain days | 6 | 7 | 9 | 11 | 12 | 8 | 5 | 5 | 6 | 7 | 7 | 6 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 19 | 6 |
| Feb | 24 | 7 |
| Mar | 30 | 9 |
| Apr | 35 | 11 |
| May | 38 | 12 |
| Jun | 27 | 8 |
| Jul | 17 | 5 |
| Aug | 15 | 5 |
| Sep | 20 | 6 |
| Oct | 23 | 7 |
| Nov | 23 | 7 |
| Dec | 19 | 6 |
Monthly rainfall
Over a full year, Mahdishahr collects about 387 mm of rain across 88 wet days — roughly 32 mm in an average month.
It doesn’t fall evenly. April is the wettest month with 59 mm, while August is the driest at just 17 mm. The three wettest months alone bring about 43% of the year’s total, and some of the cold-season precipitation falls as snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 24 | 31 | 50 | 59 | 57 | 28 | 19 | 17 | 22 | 29 | 30 | 23 |
| Rain days | 6 | 7 | 9 | 11 | 12 | 8 | 5 | 5 | 6 | 7 | 7 | 6 |
| Snow days | 7 | 7 | 7 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 6 |
| Rainfall (mm) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 24 | 6 | 7 |
| Feb | 31 | 7 | 7 |
| Mar | 50 | 9 | 7 |
| Apr | 59 | 11 | 3 |
| May | 57 | 12 | 0 |
| Jun | 28 | 8 | 0 |
| Jul | 19 | 5 | 0 |
| Aug | 17 | 5 | 0 |
| Sep | 22 | 6 | 0 |
| Oct | 29 | 7 | 1 |
| Nov | 30 | 7 | 4 |
| Dec | 23 | 6 | 6 |
Snow in Mahdishahr
Average snowy days through the year, the snow-season span, and estimated snowfall — for ski trips and the perennial 'will there be snow at Christmas?' question.
Mahdishahr averages about 34 snowy days a year. Snow season runs roughly Oct 17 to May 9 — about 6.7 months.
March is snowiest, with roughly 7 days of snow and an estimated 37 cm of snowfall. Over the year that adds up to an estimated 139 cm of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 7 | 7 | 7 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 6 |
| Snowfall (cm) | 23 | 25 | 37 | 15 | 0 | 0 | 0 | 0 | 0 | 1 | 16 | 20 |
| Snow days | Snowfall (cm) | |
|---|---|---|
| Jan | 7 | 23 |
| Feb | 7 | 25 |
| Mar | 7 | 37 |
| Apr | 3 | 15 |
| May | 0 | 0 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 1 | 1 |
| Nov | 4 | 16 |
| Dec | 6 | 20 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Mahdishahr, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around May 26 and lasts for 5.0 months, ending around October 23. The clearest month is August, when the sky is clear, mostly clear, or partly cloudy 96% of the time on average.
The cloudier part of the year begins around October 24 and lasts for 7.0 months, ending around May 25. The cloudiest month is April, when it is overcast or mostly cloudy 45% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 64 | 61 | 56 | 55 | 65 | 87 | 95 | 96 | 91 | 76 | 62 | 62 |
| Cloudier (%) | 36 | 39 | 44 | 45 | 35 | 13 | 5 | 4 | 9 | 24 | 38 | 38 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 64 | 36 |
| Feb | 61 | 39 |
| Mar | 56 | 44 |
| Apr | 55 | 45 |
| May | 65 | 35 |
| Jun | 87 | 13 |
| Jul | 95 | 5 |
| Aug | 96 | 4 |
| Sep | 91 | 9 |
| Oct | 76 | 24 |
| Nov | 62 | 38 |
| Dec | 62 | 38 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 10, brings about 14 h 24 min of light; the shortest, around January 1, only 9 h 36 min — a swing of roughly 4 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.9 | 10.6 | 11.7 | 12.9 | 13.9 | 14.4 | 14.2 | 13.3 | 12.2 | 11.1 | 10.1 | 9.6 |
| Sunrise (AM) | 7:11 | 6:52 | 6:15 | 5:30 | 4:56 | 4:45 | 4:56 | 5:20 | 5:44 | 6:09 | 6:39 | 7:05 |
| Sunset (PM) | 5:01 | 5:31 | 5:58 | 6:24 | 6:49 | 7:09 | 7:08 | 6:42 | 5:58 | 5:14 | 4:44 | 4:41 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 9.9 | 7:11 | 5:01 |
| Feb | 10.6 | 6:52 | 5:31 |
| Mar | 11.7 | 6:15 | 5:58 |
| Apr | 12.9 | 5:30 | 6:24 |
| May | 13.9 | 4:56 | 6:49 |
| Jun | 14.4 | 4:45 | 7:09 |
| Jul | 14.2 | 4:56 | 7:08 |
| Aug | 13.3 | 5:20 | 6:42 |
| Sep | 12.2 | 5:44 | 5:58 |
| Oct | 11.1 | 6:09 | 5:14 |
| Nov | 10.1 | 6:39 | 4:44 |
| Dec | 9.6 | 7:05 | 4:41 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Mahdishahr averages about 17 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 10 and 26 days.
The sunnier stretch runs 4.6 months, from around Jun 4 to Oct 22. The sunniest month is August, with roughly 25 sunny days (brilliant).
The greyest month is April, down near 10 sunny days — about 59% fewer than the August peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 16 | 13 | 12 | 10 | 12 | 19 | 24 | 26 | 23 | 19 | 14 | 15 |
| Sky | Bright | Mixed | Mixed | Mixed | Mixed | Bright | Brilliant | Brilliant | Brilliant | Bright | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 16 | Bright |
| Feb | 13 | Mixed |
| Mar | 12 | Mixed |
| Apr | 10 | Mixed |
| May | 12 | Mixed |
| Jun | 19 | Bright |
| Jul | 24 | Brilliant |
| Aug | 26 | Brilliant |
| Sep | 23 | Brilliant |
| Oct | 19 | Bright |
| Nov | 14 | Mixed |
| Dec | 15 | Mixed |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Mahdishahr, the air stays dry or comfortable essentially all year. Even in June, the muggiest month, it feels humid or worse only about 0% of the time — humidity is not something you need to plan around here.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 98 | 85 | 88 | 99 | 100 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 2 | 15 | 12 | 1 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 98 | 2 |
| Jul | 85 | 15 |
| Aug | 88 | 12 |
| Sep | 99 | 1 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Across the year, average wind speed in Mahdishahr is typically calm, near 6 km/h, and varies little with the seasons.
The windier part of the year lasts 6.3 months, from around Mar 15 to Sep 23. The windiest month is July, averaging about 7 km/h (calm).
The calmer part of the year runs from around Sep 24 to Mar 14, with December the calmest month at about 4 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 6 | 5 | 5 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 5 | calm |
| Feb | 5 | calm |
| Mar | 6 | calm |
| Apr | 6 | calm |
| May | 6 | calm |
| Jun | 7 | calm |
| Jul | 7 | calm |
| Aug | 7 | calm |
| Sep | 6 | calm |
| Oct | 5 | calm |
| Nov | 5 | calm |
| Dec | 4 | calm |
Best time to visit Mahdishahr
To characterize how pleasant the weather is in Mahdishahr throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early June, Mahdishahr is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit Mahdishahr for general outdoor tourist activities is from late May to mid October, with a peak score in the second week of September.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 0.0 | 0.0 | 1.5 | 4.3 | 6.2 | 7.5 | 7.5 | 8.0 | 8.1 | 6.2 | 2.2 | 0.0 |
| Rating | poor | poor | poor | fair | good | good | good | ideal | ideal | good | poor | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 0.0 | poor |
| Feb | 0.0 | poor |
| Mar | 1.5 | poor |
| Apr | 4.3 | fair |
| May | 6.2 | good |
| Jun | 7.5 | good |
| Jul | 7.5 | good |
| Aug | 8.0 | ideal |
| Sep | 8.1 | ideal |
| Oct | 6.2 | good |
| Nov | 2.2 | poor |
| Dec | 0.0 | poor |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Mahdishahr for hot-weather activities is from mid June to mid September, with a peak score in the first week of August.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Mahdishahr, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around July (highs near 28°C), the essentials are light clothes and sun protection. In the cold season around January (highs near 2°C), pack a warm layer and a heavy coat.
In July, Mahdishahr sees daytime highs around 28°C and nights near 18°C. Pack light clothes and sun protection. About 5 days see rain.
UV index (midday) in Mahdishahr by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Mahdishahr peaks around July 19 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 5 | 5 | 8 | 10 | 10 | 11 | 10 | 8 | 6 | 4 | 3 |
| Level | Moderate | High | Moderate | Very high | Very high | Very high | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | High |
| Mar | 5 | Moderate |
| Apr | 8 | Very high |
| May | 10 | Very high |
| Jun | 10 | Very high |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Average hourly UV index in Mahdishahr
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in July the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 6.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 1 | 4.5 | 5 | 7 | 8 | 8.5 | 9 | 8.5 | 7 | 5.5 | 3 | 1 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 3.5 | 5.5 | 6 | 6.5 | 6 | 4 | 0.5 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 1 | 0 |
| Feb | 4.5 | 0 |
| Mar | 5 | 0 |
| Apr | 7 | 3.5 |
| May | 8 | 5.5 |
| Jun | 8.5 | 6 |
| Jul | 9 | 6.5 |
| Aug | 8.5 | 6 |
| Sep | 7 | 4 |
| Oct | 5.5 | 0.5 |
| Nov | 3 | 0 |
| Dec | 1 | 0 |
Air quality in Mahdishahr by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Mahdishahr is worst in December — around 45 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (July, 22 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 43 | 41 | 39 | 38 | 33 | 25 | 22 | 24 | 31 | 36 | 41 | 45 |
| Level | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 43 | Poor |
| Feb | 41 | Poor |
| Mar | 39 | Poor |
| Apr | 38 | Poor |
| May | 33 | Moderate |
| Jun | 25 | Moderate |
| Jul | 22 | Moderate |
| Aug | 24 | Moderate |
| Sep | 31 | Moderate |
| Oct | 36 | Poor |
| Nov | 41 | Poor |
| Dec | 45 | Poor |
Growing season
The growing season in Mahdishahr typically lasts about 255 days, from around March 14 to November 23 — the span where a frost-free day is more likely than not. It is reliably frost-free from April 10 to November 5.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 9 | 19 | 54 | 92 | 100 | 100 | 100 | 100 | 100 | 99 | 68 | 22 |
| Frost nights | 31 | 28 | 31 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 26 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 9 | 31 |
| Feb | 19 | 28 |
| Mar | 54 | 31 |
| Apr | 92 | 10 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 99 | 0 |
| Nov | 68 | 26 |
| Dec | 22 | 31 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Mahdishahr banks about 1,638 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 0 | 0 | 0 | 25 | 173 | 307 | 398 | 382 | 264 | 89 | 0 | 0 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 0 |
| Apr | 25 |
| May | 173 |
| Jun | 307 |
| Jul | 398 |
| Aug | 382 |
| Sep | 264 |
| Oct | 89 |
| Nov | 0 |
| Dec | 0 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Mahdishahr receives about 5.1 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 2.8 and 7.0 kWh/m².
The brighter stretch of the year lasts 6.4 months, from around Mar 11 to Sep 21. The brightest month is June, averaging about 6.9 kWh/m² (intense).
The dimmest month is December, down near 2.9 kWh/m² — roughly 58% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.3 | 4.3 | 5.3 | 6.1 | 6.6 | 7.0 | 6.8 | 6.5 | 5.4 | 4.3 | 3.2 | 2.9 |
| Level | Moderate | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 3.3 | Moderate |
| Feb | 4.3 | Bright |
| Mar | 5.3 | Bright |
| Apr | 6.1 | Intense |
| May | 6.6 | Intense |
| Jun | 7.0 | Intense |
| Jul | 6.8 | Intense |
| Aug | 6.5 | Intense |
| Sep | 5.4 | Bright |
| Oct | 4.3 | Bright |
| Nov | 3.2 | Moderate |
| Dec | 2.9 | Moderate |
Where is Mahdishahr?
Mahdishahr sits at 35.7°N, 53.4°E, 1,600 m above sea level, in Iran. The nearest listed city is Semnan, 15 km away.
Topography around Mahdishahr
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mahdishahr.
Within 3 km, the terrain around Mahdishahr has large variations in elevation — a maximum elevation change of 628 m around an average of 1,736 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,150 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,814 m.
The land around Mahdishahr is covered by bare terrain (79%) within 3 km, bare terrain (64%) and grassland (31%) within 16 km, and bare terrain (56%) and grassland (26%) within 80 km.
Iran travel facts
- Travel advisory
- Level 4
- Do Not Travel
- Power plugs
- Type C / F
- 220 V · 50 Hz
- Prices
- ≈ 352% of US
- price level, 2025
- GDP per capita
- $3,924
- 2025
- Happiness
- 5.2 / 10
- World Happiness, 2025
- Safe drinking water
- 94%
- of population, 2024
- Homicide rate
- 2.4
- per 100k, 2014
- Road deaths
- 21.5
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 492
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mahdishahr (35.7107°, 53.3539°, elevation 1,600 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).