Climate and average weather in Zīr Āb
In Zīr Āb, the summers are humid, warm, showery, and partly cloudy and the winters are cool, snowy, and mostly clear.
Over the course of the year, the temperature in Zīr Āb typically varies from -1°C to 27°C, and is rarely below -8°C or above 31°C. August is the hottest month of the year, while January is the coldest.
Based on the travel score, the best time of year to visit Zīr Āb for warm-weather activities is from mid May to early November.
- Hottest
- Aug
- 27°
- Coldest
- Jan
- -1°
- Wettest
- Sep
- 153 mm
- Driest
- Dec
- 69 mm
- Rain / yr
- 1134 mm
- 151 wet days
- Daylight
- 9.5–14.5 h
- shortest–longest
- Elevation
- 398 m
- 36.2°N
- Clearest
- Jan
- 50% cloud
Zīr Āb is city in Mazandaran Province, Iran.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Zīr Āb 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 mid May to early November.
Temperature through the year
Daily average highs and lows in Zīr Āb, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.1 months, from May 27 to September 27, with daily high temperatures above 23°C. The hottest month of the year in Zīr Āb is August, with an average high of 27°C and low of 19°C.
The cool season lasts 3.3 months, from November 30 to March 10, with daily high temperatures below 12°C. The coldest month of the year in Zīr Āb is January, with an average low of -1°C and high of 9°C.
Days typically run about 9°C warmer than nights, with the widest day–night swing (around 10°C) in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 13 | 17 | 21 | 25 | 27 | 27 | 24 | 20 | 15 | 11 |
| Avg low (°C) | -1 | 0 | 3 | 8 | 13 | 17 | 19 | 19 | 16 | 11 | 5 | 1 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 9 | -1 |
| Feb | 10 | 0 |
| Mar | 13 | 3 |
| Apr | 17 | 8 |
| May | 21 | 13 |
| Jun | 25 | 17 |
| Jul | 27 | 19 |
| Aug | 27 | 19 |
| Sep | 24 | 16 |
| Oct | 20 | 11 |
| Nov | 15 | 5 |
| Dec | 11 | 1 |
How hot and cold Zīr Āb 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 -4°C (around January 23), with roughly 84 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) | 9 | 10 | 13 | 17 | 21 | 25 | 27 | 28 | 24 | 20 | 15 | 11 |
| Air high (°C) | 9 | 10 | 13 | 17 | 21 | 25 | 27 | 27 | 24 | 20 | 15 | 11 |
| Feels-like low (°C) | -3 | -2 | 2 | 8 | 13 | 17 | 19 | 19 | 16 | 11 | 4 | -1 |
| Air low (°C) | -1 | 0 | 3 | 8 | 13 | 17 | 19 | 19 | 16 | 11 | 5 | 1 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 9 | 9 | -3 | -1 |
| Feb | 10 | 10 | -2 | 0 |
| Mar | 13 | 13 | 2 | 3 |
| Apr | 17 | 17 | 8 | 8 |
| May | 21 | 21 | 13 | 13 |
| Jun | 25 | 25 | 17 | 17 |
| Jul | 27 | 27 | 19 | 19 |
| Aug | 28 | 27 | 19 | 19 |
| Sep | 24 | 24 | 16 | 16 |
| Oct | 20 | 20 | 11 | 11 |
| Nov | 15 | 15 | 4 | 5 |
| Dec | 11 | 11 | -1 | 1 |
Average hourly temperature in Zīr Āb
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 August afternoons, near 27°C, and coldest before dawn in January, near -1°C.
Zīr Āb 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 | 9° / -1° | 71 | 9.7 | 6 | 9.8 | 2.0 |
| Feb | 10° / -0° | 79 | 11 | 6.3 | 10.6 | 2.2 |
| Mar | 13° / 3° | 100 | 14.3 | 4.5 | 11.7 | 3.4 |
| Apr | 17° / 8° | 98 | 15.1 | 0.9 | 12.9 | 4.8 |
| May | 21° / 13° | 105 | 16 | 0 | 13.9 | 5.6 |
| Jun | 25° / 17° | 75 | 11.8 | 0 | 14.4 | 6.5 |
| Jul | 27° / 19° | 73 | 12.8 | 0 | 14.2 | 6.2 |
| Aug | 27° / 19° | 83 | 12.3 | 0 | 13.4 | 6.2 |
| Sep | 24° / 16° | 153 | 14 | 0 | 12.2 | 6.2 |
| Oct | 20° / 11° | 124 | 12.6 | 0 | 11.1 | 6.1 |
| Nov | 15° / 5° | 105 | 11.9 | 1.8 | 10.1 | 4.4 |
| Dec | 11° / 1° | 69 | 9.3 | 4 | 9.6 | 2.9 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Zīr Āb gets about 1134 mm of precipitation a year. On a typical day the chance of rain is often wet, but that rises and falls sharply with the seasons.
The wetter season lasts 3.1 months, from around Mar 2 to Jun 4, peaking in May at about 56% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Dec 29.
September is the wettest month by volume, with 153 mm over about 14 wet days; December is the driest, with 69 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 (%) | 32 | 38 | 46 | 50 | 52 | 40 | 40 | 40 | 47 | 41 | 40 | 31 |
| Rain days | 10 | 11 | 14 | 15 | 16 | 12 | 13 | 12 | 14 | 13 | 12 | 9 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 32 | 10 |
| Feb | 38 | 11 |
| Mar | 46 | 14 |
| Apr | 50 | 15 |
| May | 52 | 16 |
| Jun | 40 | 12 |
| Jul | 40 | 13 |
| Aug | 40 | 12 |
| Sep | 47 | 14 |
| Oct | 41 | 13 |
| Nov | 40 | 12 |
| Dec | 31 | 9 |
Monthly rainfall
Over a full year, Zīr Āb collects about 1134 mm of rain across 151 wet days — roughly 95 mm in an average month.
It doesn’t fall evenly. September is the wettest month with 153 mm, while December is the driest at just 69 mm. The three wettest months alone bring about 34% 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) | 71 | 79 | 100 | 98 | 105 | 75 | 73 | 83 | 153 | 124 | 105 | 69 |
| Rain days | 10 | 11 | 14 | 15 | 16 | 12 | 13 | 12 | 14 | 13 | 12 | 9 |
| Snow days | 6 | 6 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 4 |
| Rainfall (mm) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 71 | 10 | 6 |
| Feb | 79 | 11 | 6 |
| Mar | 100 | 14 | 5 |
| Apr | 98 | 15 | 1 |
| May | 105 | 16 | 0 |
| Jun | 75 | 12 | 0 |
| Jul | 73 | 13 | 0 |
| Aug | 83 | 12 | 0 |
| Sep | 153 | 14 | 0 |
| Oct | 124 | 13 | 0 |
| Nov | 105 | 12 | 2 |
| Dec | 69 | 9 | 4 |
Snow in Zīr Āb
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.
Zīr Āb averages about 24 snowy days a year. Snow season runs roughly Nov 1 to Apr 23 — about 5.7 months.
February is snowiest, with roughly 7 days of snow and an estimated 33 cm of snowfall. Over the year that adds up to an estimated 120 cm of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 6 | 6 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 4 |
| Snowfall (cm) | 31 | 33 | 24 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 10 | 19 |
| Snow days | Snowfall (cm) | |
|---|---|---|
| Jan | 6 | 31 |
| Feb | 6 | 33 |
| Mar | 5 | 24 |
| Apr | 1 | 4 |
| May | 0 | 0 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 0 | 0 |
| Nov | 2 | 10 |
| Dec | 4 | 19 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Zīr Āb, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around September 23 and lasts for 4.9 months, ending around February 19. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 56% of the time on average.
The cloudier part of the year begins around February 20 and lasts for 4.9 months, ending around July 17. The cloudiest month is April, when it is overcast or mostly cloudy 62% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 56 | 50 | 42 | 38 | 40 | 45 | 47 | 54 | 48 | 53 | 50 | 55 |
| Cloudier (%) | 44 | 50 | 58 | 62 | 60 | 55 | 53 | 46 | 52 | 47 | 50 | 45 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 56 | 44 |
| Feb | 50 | 50 |
| Mar | 42 | 58 |
| Apr | 38 | 62 |
| May | 40 | 60 |
| Jun | 45 | 55 |
| Jul | 47 | 53 |
| Aug | 54 | 46 |
| Sep | 48 | 52 |
| Oct | 53 | 47 |
| Nov | 50 | 50 |
| Dec | 55 | 45 |
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 17, brings about 14 h 30 min of light; the shortest, around December 17, only 9 h 30 min — a swing of roughly 5 hours.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.8 | 10.6 | 11.7 | 12.9 | 13.9 | 14.4 | 14.2 | 13.4 | 12.2 | 11.1 | 10.1 | 9.6 |
| Sunrise (AM) | 7:14 | 6:54 | 6:16 | 5:31 | 4:57 | 4:45 | 4:57 | 5:21 | 5:46 | 6:11 | 6:42 | 7:08 |
| Sunset (PM) | 5:01 | 5:32 | 5:59 | 6:26 | 6:52 | 7:12 | 7:11 | 6:44 | 5:59 | 5:15 | 4:45 | 4:41 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 9.8 | 7:14 | 5:01 |
| Feb | 10.6 | 6:54 | 5:32 |
| Mar | 11.7 | 6:16 | 5:59 |
| Apr | 12.9 | 5:31 | 6:26 |
| May | 13.9 | 4:57 | 6:52 |
| Jun | 14.4 | 4:45 | 7:12 |
| Jul | 14.2 | 4:57 | 7:11 |
| Aug | 13.4 | 5:21 | 6:44 |
| Sep | 12.2 | 5:46 | 5:59 |
| Oct | 11.1 | 6:11 | 5:15 |
| Nov | 10.1 | 6:42 | 4:45 |
| Dec | 9.6 | 7:08 | 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.
Zīr Āb averages about 11 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 6 and 15 days.
The sunnier stretch runs 5.6 months, from around Sep 15 to Mar 2. The sunniest month is December, with roughly 13 sunny days (mixed).
The greyest month is May, down near 7 sunny days — about 48% fewer than the December peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 14 | 11 | 10 | 8 | 7 | 8 | 9 | 12 | 11 | 12 | 11 | 13 |
| Sky | Mixed | Mixed | Mixed | Gloomy | Gloomy | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 14 | Mixed |
| Feb | 11 | Mixed |
| Mar | 10 | Mixed |
| Apr | 8 | Gloomy |
| May | 7 | Gloomy |
| Jun | 8 | Mixed |
| Jul | 9 | Mixed |
| Aug | 12 | Mixed |
| Sep | 11 | Mixed |
| Oct | 12 | Mixed |
| Nov | 11 | Mixed |
| Dec | 13 | 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 Zīr Āb, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 4.4 months, from around May 21 to October 1. The muggiest month is July, when the air feels humid, muggy or worse about 96% of the time.
The most comfortable stretch runs from around October 2 to May 20, and March is the most comfortable month — the air is dry or comfortable 100% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 90 | 35 | 3 | 0 | 1 | 9 | 63 | 98 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 10 | 39 | 16 | 4 | 9 | 25 | 27 | 2 | 0 |
| Humid (%) | 0 | 0 | 0 | 1 | 23 | 44 | 23 | 23 | 34 | 9 | 0 | 0 |
| Muggy (%) | 0 | 0 | 0 | 0 | 3 | 35 | 55 | 50 | 30 | 1 | 0 | 0 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 3 | 19 | 16 | 2 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| Jan | 100 | 0 | 0 | 0 | 0 |
| Feb | 100 | 0 | 0 | 0 | 0 |
| Mar | 100 | 0 | 0 | 0 | 0 |
| Apr | 90 | 10 | 1 | 0 | 0 |
| May | 35 | 39 | 23 | 3 | 0 |
| Jun | 3 | 16 | 44 | 35 | 3 |
| Jul | 0 | 4 | 23 | 55 | 19 |
| Aug | 1 | 9 | 23 | 50 | 16 |
| Sep | 9 | 25 | 34 | 30 | 2 |
| Oct | 63 | 27 | 9 | 1 | 0 |
| Nov | 98 | 2 | 0 | 0 | 0 |
| Dec | 100 | 0 | 0 | 0 | 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.
Wind in Zīr Āb is steady company: average speeds sit near 5 km/h — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 6 | calm |
| Feb | 6 | calm |
| Mar | 6 | calm |
| Apr | 6 | calm |
| May | 5 | calm |
| Jun | 5 | calm |
| Jul | 5 | calm |
| Aug | 5 | calm |
| Sep | 5 | calm |
| Oct | 5 | calm |
| Nov | 5 | calm |
| Dec | 5 | calm |
Best time to visit Zīr Āb
To characterize how pleasant the weather is in Zīr Āb throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late October, Zīr Āb is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
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 Zīr Āb for general outdoor tourist activities is from mid May to early November, with a peak score in the second week of June.
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) | 2.0 | 2.2 | 3.4 | 4.8 | 5.6 | 6.5 | 6.2 | 6.3 | 6.2 | 6.1 | 4.4 | 2.9 |
| Rating | poor | poor | poor | fair | good | good | good | good | good | good | fair | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 2.0 | poor |
| Feb | 2.2 | poor |
| Mar | 3.4 | poor |
| Apr | 4.8 | fair |
| May | 5.6 | good |
| Jun | 6.5 | good |
| Jul | 6.2 | good |
| Aug | 6.3 | good |
| Sep | 6.2 | good |
| Oct | 6.1 | good |
| Nov | 4.4 | fair |
| Dec | 2.9 | 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 Zīr Āb for hot-weather activities is from early 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 Zīr Āb, 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 August (highs near 27°C), the essentials are light clothes, rain gear and sun protection. In the cold season around January (highs near 9°C), pack a warm layer and rain gear.
In August, Zīr Āb sees daytime highs around 27°C and nights near 19°C. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.
UV index (midday) in Zīr Āb 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 Zīr Āb peaks around July 21 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 12 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 | 9 | 11 | 10 | 8 | 6 | 4 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Very high | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | High |
| Apr | 8 | Very high |
| May | 10 | Very high |
| Jun | 9 | 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 Zīr Āb
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 8.5 hours a day reach index 3 (protection recommended), and 6 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) | 0 | 4.5 | 5 | 7 | 8 | 8.5 | 8.5 | 8 | 7 | 5.5 | 3 | 2 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 4 | 5.5 | 5.5 | 6 | 5.5 | 4 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 4.5 | 0 |
| Mar | 5 | 0 |
| Apr | 7 | 4 |
| May | 8 | 5.5 |
| Jun | 8.5 | 5.5 |
| Jul | 8.5 | 6 |
| Aug | 8 | 5.5 |
| Sep | 7 | 4 |
| Oct | 5.5 | 0 |
| Nov | 3 | 0 |
| Dec | 2 | 0 |
Air quality in Zīr Āb 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 Zīr Āb 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 Zīr Āb typically lasts about 310 days, from around February 19 to December 25 — the span where a frost-free day is more likely than not. It is reliably frost-free from March 23 to November 18.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 38 | 48 | 81 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 91 | 60 |
| Frost nights | 31 | 28 | 23 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 38 | 31 |
| Feb | 48 | 28 |
| Mar | 81 | 23 |
| Apr | 99 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 91 | 13 |
| Dec | 60 | 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. Zīr Āb banks about 1,962 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 0 | 0 | 1 | 84 | 222 | 327 | 404 | 411 | 312 | 179 | 24 | 0 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 1 |
| Apr | 84 |
| May | 222 |
| Jun | 327 |
| Jul | 404 |
| Aug | 411 |
| Sep | 312 |
| Oct | 179 |
| Nov | 24 |
| 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.
Zīr Āb receives about 4.3 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 2.4 and 5.8 kWh/m².
The brighter stretch of the year lasts 6.3 months, from around Mar 8 to Sep 15. The brightest month is July, averaging about 5.6 kWh/m² (bright).
The dimmest month is December, down near 2.5 kWh/m² — roughly 56% less than the July peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 2.8 | 3.6 | 4.5 | 5.2 | 5.6 | 5.7 | 5.6 | 5.5 | 4.3 | 3.6 | 2.7 | 2.5 |
| Level | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 2.8 | Moderate |
| Feb | 3.6 | Moderate |
| Mar | 4.5 | Bright |
| Apr | 5.2 | Bright |
| May | 5.6 | Bright |
| Jun | 5.7 | Bright |
| Jul | 5.6 | Bright |
| Aug | 5.5 | Bright |
| Sep | 4.3 | Bright |
| Oct | 3.6 | Moderate |
| Nov | 2.7 | Moderate |
| Dec | 2.5 | Moderate |
Where is Zīr Āb?
Zīr Āb sits at 36.2°N, 53.0°E, 398 m above sea level, in Iran. The nearest listed city is Qā’em Shahr, 33 km away.
Topography around Zīr Āb
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Zīr Āb.
Within 3 km, the terrain around Zīr Āb has large variations in elevation — a maximum elevation change of 760 m around an average of 648 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,045 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,024 m.
The land around Zīr Āb is covered by trees (81%) within 3 km, trees (89%) within 16 km, and trees (32%) and grassland (32%) 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 Zīr Āb (36.1797°, 52.9735°, elevation 398 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).