Climate and average weather in Nā’īn
In Nā’īn, the summers are sweltering, dry, and clear and the winters are cool, snowy, and mostly clear.
Over the course of the year, the temperature in Nā’īn typically varies from -1°C to 34°C, and is rarely below -8°C or above 38°C. July is the hottest month of the year, while January is the coldest.
Based on the travel score, the best times of year to visit Nā’īn for warm-weather activities are from mid April to late May and mid September to early November.
- Hottest
- Jul
- 34°
- Coldest
- Jan
- -1°
- Wettest
- Mar
- 27 mm
- Driest
- Jul
- 0 mm
- Rain / yr
- 146 mm
- 35 wet days
- Daylight
- 9.8–14.2 h
- shortest–longest
- Elevation
- 1,564 m
- 32.9°N
- Clearest
- Sep
- 9% cloud
Nā’īn is city in Isfahan Province, Iran.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Nā’īn 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 September to early November.
Temperature through the year
Daily average highs and lows in Nā’īn, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.3 months, from May 20 to September 26, with daily high temperatures above 28°C. The hottest month of the year in Nā’īn is July, with an average high of 34°C and low of 23°C.
The cool season lasts 3.1 months, from November 24 to February 25, with daily high temperatures below 13°C. The coldest month of the year in Nā’īn is January, with an average low of -1°C and high of 8°C.
Days typically run about 11°C warmer than nights, with the widest day–night swing (around 13°C) in September.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 11 | 16 | 22 | 27 | 33 | 34 | 33 | 30 | 23 | 15 | 10 |
| Avg low (°C) | -1 | 1 | 6 | 11 | 16 | 21 | 23 | 21 | 17 | 11 | 5 | 1 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 8 | -1 |
| Feb | 11 | 1 |
| Mar | 16 | 6 |
| Apr | 22 | 11 |
| May | 27 | 16 |
| Jun | 33 | 21 |
| Jul | 34 | 23 |
| Aug | 33 | 21 |
| Sep | 30 | 17 |
| Oct | 23 | 11 |
| Nov | 15 | 5 |
| Dec | 10 | 1 |
How hot and cold Nā’īn 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 hottest afternoons, once humidity is folded in, Nā’īn feels like about 35°C (around July 7). About 82 days a year carry some heat stress, peaking in July.
On the coldest nights, wind chill pulls the feels-like down to about -6°C (around January 19), with roughly 99 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) | 8 | 11 | 16 | 22 | 27 | 33 | 34 | 33 | 30 | 23 | 15 | 10 |
| Air high (°C) | 8 | 11 | 16 | 22 | 27 | 33 | 34 | 33 | 30 | 23 | 15 | 10 |
| Feels-like low (°C) | -5 | -3 | 2 | 10 | 16 | 21 | 23 | 21 | 17 | 11 | 2 | -3 |
| Air low (°C) | -1 | 1 | 6 | 11 | 16 | 21 | 23 | 21 | 17 | 11 | 5 | 1 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 8 | 8 | -5 | -1 |
| Feb | 11 | 11 | -3 | 1 |
| Mar | 16 | 16 | 2 | 6 |
| Apr | 22 | 22 | 10 | 11 |
| May | 27 | 27 | 16 | 16 |
| Jun | 33 | 33 | 21 | 21 |
| Jul | 34 | 34 | 23 | 23 |
| Aug | 33 | 33 | 21 | 21 |
| Sep | 30 | 30 | 17 | 17 |
| Oct | 23 | 23 | 11 | 11 |
| Nov | 15 | 15 | 2 | 5 |
| Dec | 10 | 10 | -3 | 1 |
Average hourly temperature in Nā’īn
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 34°C, and coldest before dawn in January, near -1°C.
Nā’īn 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 | 8° / -1° | 21 | 4.8 | 2.9 | 10.1 | 1.8 |
| Feb | 11° / 1° | 18 | 4.4 | 1.6 | 10.8 | 3.4 |
| Mar | 16° / 6° | 27 | 5.5 | 0.8 | 11.8 | 5.9 |
| Apr | 22° / 11° | 25 | 6.1 | 0.1 | 12.8 | 7.4 |
| May | 27° / 16° | 16 | 4.3 | 0 | 13.7 | 7.3 |
| Jun | 33° / 21° | 1 | 0.3 | 0 | 14.1 | 5.0 |
| Jul | 34° / 23° | 0 | 0.1 | 0 | 13.9 | 3.8 |
| Aug | 33° / 21° | 0 | 0.1 | 0 | 13.2 | 4.7 |
| Sep | 30° / 17° | 0 | 0 | 0 | 12.2 | 7.1 |
| Oct | 23° / 11° | 5 | 1.7 | 0 | 11.2 | 8.8 |
| Nov | 15° / 5° | 16 | 3.6 | 0.5 | 10.3 | 5.7 |
| Dec | 10° / 1° | 16 | 3.8 | 1.5 | 9.9 | 3.0 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Nā’īn gets about 146 mm of precipitation a year. On a typical day the chance of rain is mostly dry, but that rises and falls sharply with the seasons.
The wetter season lasts 6.7 months, from around Nov 3 to May 24, peaking in April at about 22% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jul 6.
March is the wettest month by volume, with 27 mm over about 6 wet days; July is the driest, with 0 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 (%) | 15 | 16 | 18 | 21 | 13 | 2 | 0 | 0 | 0 | 5 | 12 | 13 |
| Rain days | 5 | 4 | 6 | 6 | 4 | 0 | 0 | 0 | 0 | 2 | 4 | 4 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 15 | 5 |
| Feb | 16 | 4 |
| Mar | 18 | 6 |
| Apr | 21 | 6 |
| May | 13 | 4 |
| Jun | 2 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 5 | 2 |
| Nov | 12 | 4 |
| Dec | 13 | 4 |
Monthly rainfall
Over a full year, Nā’īn collects about 146 mm of rain across 35 wet days — roughly 12 mm in an average month.
It doesn’t fall evenly. March is the wettest month with 27 mm, while July is the driest at just 0 mm. The three wettest months alone bring about 49% 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) | 21 | 18 | 27 | 25 | 16 | 1 | 0 | 0 | 0 | 5 | 16 | 16 |
| Rain days | 5 | 4 | 6 | 6 | 4 | 0 | 0 | 0 | 0 | 2 | 4 | 4 |
| Snow days | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| Rainfall (mm) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 21 | 5 | 3 |
| Feb | 18 | 4 | 2 |
| Mar | 27 | 6 | 1 |
| Apr | 25 | 6 | 0 |
| May | 16 | 4 | 0 |
| Jun | 1 | 0 | 0 |
| Jul | 0 | 0 | 0 |
| Aug | 0 | 0 | 0 |
| Sep | 0 | 0 | 0 |
| Oct | 5 | 2 | 0 |
| Nov | 16 | 4 | 1 |
| Dec | 16 | 4 | 2 |
Snow in Nā’īn
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.
Nā’īn averages about 7 snowy days a year. Snow season runs roughly Nov 14 to Mar 23 — about 4.3 months.
January is snowiest, with roughly 3 days of snow and an estimated 14 cm of snowfall. Over the year that adds up to an estimated 36 cm of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| Snowfall (cm) | 14 | 8 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 8 |
| Snow days | Snowfall (cm) | |
|---|---|---|
| Jan | 3 | 14 |
| Feb | 2 | 8 |
| Mar | 1 | 3 |
| Apr | 0 | 0 |
| May | 0 | 0 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 0 | 0 |
| Nov | 1 | 2 |
| Dec | 2 | 8 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Nā’īn, 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 23 and lasts for 5.2 months, ending around October 27. The clearest month is July, when the sky is clear, mostly clear, or partly cloudy 99% of the time on average.
The cloudier part of the year begins around October 28 and lasts for 6.8 months, ending around May 22. The cloudiest month is April, when it is overcast or mostly cloudy 35% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 73 | 77 | 69 | 65 | 77 | 97 | 99 | 99 | 99 | 90 | 73 | 74 |
| Cloudier (%) | 27 | 23 | 31 | 35 | 23 | 3 | 1 | 1 | 1 | 10 | 27 | 26 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 73 | 27 |
| Feb | 77 | 23 |
| Mar | 69 | 31 |
| Apr | 65 | 35 |
| May | 77 | 23 |
| Jun | 97 | 3 |
| Jul | 99 | 1 |
| Aug | 99 | 1 |
| Sep | 99 | 1 |
| Oct | 90 | 10 |
| Nov | 73 | 27 |
| Dec | 74 | 26 |
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 16, brings about 14 h 12 min of light; the shortest, around December 15, only 9 h 48 min — a swing of roughly 4 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.1 | 10.8 | 11.8 | 12.8 | 13.7 | 14.1 | 13.9 | 13.2 | 12.2 | 11.2 | 10.3 | 9.9 |
| Sunrise (AM) | 7:05 | 6:48 | 6:15 | 5:34 | 5:03 | 4:53 | 5:04 | 5:25 | 5:46 | 6:08 | 6:35 | 6:58 |
| Sunset (PM) | 5:09 | 5:36 | 6:00 | 6:22 | 6:44 | 7:02 | 7:02 | 6:38 | 5:58 | 5:18 | 4:51 | 4:49 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 10.1 | 7:05 | 5:09 |
| Feb | 10.8 | 6:48 | 5:36 |
| Mar | 11.8 | 6:15 | 6:00 |
| Apr | 12.8 | 5:34 | 6:22 |
| May | 13.7 | 5:03 | 6:44 |
| Jun | 14.1 | 4:53 | 7:02 |
| Jul | 13.9 | 5:04 | 7:02 |
| Aug | 13.2 | 5:25 | 6:38 |
| Sep | 12.2 | 5:46 | 5:58 |
| Oct | 11.2 | 6:08 | 5:18 |
| Nov | 10.3 | 6:35 | 4:51 |
| Dec | 9.9 | 6:58 | 4:49 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Nā’īn averages about 21 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 13 and 29 days.
The sunnier stretch runs 4.9 months, from around May 31 to Oct 26. The sunniest month is September, with roughly 28 sunny days (brilliant).
The greyest month is April, down near 13 sunny days — about 53% fewer than the September peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 19 | 17 | 16 | 13 | 17 | 25 | 28 | 29 | 28 | 25 | 18 | 19 |
| Sky | Bright | Bright | Bright | Mixed | Bright | Brilliant | Brilliant | Brilliant | Brilliant | Brilliant | Bright | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 19 | Bright |
| Feb | 17 | Bright |
| Mar | 16 | Bright |
| Apr | 13 | Mixed |
| May | 17 | Bright |
| Jun | 25 | Brilliant |
| Jul | 28 | Brilliant |
| Aug | 29 | Brilliant |
| Sep | 28 | Brilliant |
| Oct | 25 | Brilliant |
| Nov | 18 | Bright |
| Dec | 19 | Bright |
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 Nā’īn, the air stays dry or comfortable essentially all year. Even in January, 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 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| Jan | 100 |
| Feb | 100 |
| Mar | 100 |
| Apr | 100 |
| May | 100 |
| Jun | 100 |
| Jul | 100 |
| Aug | 100 |
| Sep | 100 |
| Oct | 100 |
| Nov | 100 |
| Dec | 100 |
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 Nā’īn is typically light breeze, near 13 km/h, and varies moderately with the seasons.
The windier part of the year lasts 7.1 months, from around Jan 29 to Sep 1. The windiest month is July, averaging about 15 km/h (light breeze).
The calmer part of the year runs from around Sep 2 to Jan 28, with October the calmest month at about 10 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 12 | 14 | 15 | 14 | 13 | 14 | 15 | 14 | 12 | 10 | 10 | 11 |
| Feels | calm | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 12 | calm |
| Feb | 14 | light breeze |
| Mar | 15 | light breeze |
| Apr | 14 | light breeze |
| May | 13 | light breeze |
| Jun | 14 | light breeze |
| Jul | 15 | light breeze |
| Aug | 14 | light breeze |
| Sep | 12 | calm |
| Oct | 10 | calm |
| Nov | 10 | calm |
| Dec | 11 | calm |
Hazard calendar for Nā’īn
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Nā’īn sees seasonal dust haze (July), heaviest in July.
Best time to visit Nā’īn
To characterize how pleasant the weather is in Nā’īn throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late October, Nā’īn 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 times of year to visit Nā’īn for general outdoor tourist activities run from mid April to late May and again from mid September to early November, with a peak score in the second week of October.
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) | 1.9 | 3.4 | 5.8 | 7.3 | 7.3 | 5.0 | 3.9 | 4.8 | 7.1 | 8.7 | 5.7 | 3.0 |
| Rating | poor | poor | good | good | good | fair | fair | fair | good | ideal | good | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 1.9 | poor |
| Feb | 3.4 | poor |
| Mar | 5.8 | good |
| Apr | 7.3 | good |
| May | 7.3 | good |
| Jun | 5.0 | fair |
| Jul | 3.9 | fair |
| Aug | 4.8 | fair |
| Sep | 7.1 | good |
| Oct | 8.7 | ideal |
| Nov | 5.7 | good |
| Dec | 3.0 | 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 Nā’īn for hot-weather activities is from mid May to mid October, with a peak score in the third week of September.
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 Nā’īn, 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 34°C), the essentials are light clothes and sun protection. In the cold season around January (highs near 8°C), pack a warm layer.
In July, Nā’īn sees daytime highs around 34°C and nights near 23°C. Pack light clothes and sun protection.
UV index (midday) in Nā’īn 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 Nā’īn peaks around July 18 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 — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 6 | 6 | 8 | 10 | 10 | 11 | 10 | 8 | 7 | 4 | 4 |
| Level | Moderate | High | High | Very high | Very high | Very high | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 6 | High |
| Mar | 6 | High |
| Apr | 8 | Very high |
| May | 10 | Very high |
| Jun | 10 | Very high |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 7 | High |
| Nov | 4 | Moderate |
| Dec | 4 | Moderate |
Average hourly UV index in Nā’īn
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) | 1.5 | 5 | 5.5 | 7 | 8 | 8.5 | 8.5 | 8 | 7 | 6 | 4 | 2.5 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 4 | 5.5 | 5.5 | 6 | 5.5 | 4 | 2.5 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 1.5 | 0 |
| Feb | 5 | 0 |
| Mar | 5.5 | 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 | 6 | 2.5 |
| Nov | 4 | 0 |
| Dec | 2.5 | 0 |
Air quality in Nā’īn 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 Nā’īn is worst in July — around 31 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 13 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) | 16 | 19 | 23 | 30 | 30 | 24 | 31 | 21 | 23 | 18 | 13 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 16 | Moderate |
| Feb | 19 | Moderate |
| Mar | 23 | Moderate |
| Apr | 30 | Moderate |
| May | 30 | Moderate |
| Jun | 24 | Moderate |
| Jul | 31 | Moderate |
| Aug | 21 | Moderate |
| Sep | 23 | Moderate |
| Oct | 18 | Moderate |
| Nov | 13 | Moderate |
| Dec | 13 | Moderate |
Growing season
The growing season in Nā’īn typically lasts about 319 days, from around February 9 to December 24 — the span where a frost-free day is more likely than not. It is reliably frost-free from March 15 to November 16.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 37 | 59 | 90 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 90 | 58 |
| Frost nights | 31 | 28 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 37 | 31 |
| Feb | 59 | 28 |
| Mar | 90 | 15 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 90 | 16 |
| Dec | 58 | 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. Nā’īn banks about 2,828 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 | 33 | 184 | 358 | 496 | 574 | 524 | 402 | 229 | 28 | 0 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 33 |
| Apr | 184 |
| May | 358 |
| Jun | 496 |
| Jul | 574 |
| Aug | 524 |
| Sep | 402 |
| Oct | 229 |
| Nov | 28 |
| 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.
Nā’īn receives about 5.8 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.3 and 8.0 kWh/m².
The brighter stretch of the year lasts 6.4 months, from around Mar 18 to Sep 29. The brightest month is June, averaging about 7.9 kWh/m² (intense).
The dimmest month is December, down near 3.3 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) | 3.7 | 4.7 | 5.8 | 6.8 | 7.5 | 8.0 | 7.6 | 7.3 | 6.4 | 5.1 | 3.8 | 3.3 |
| Level | Moderate | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 3.7 | Moderate |
| Feb | 4.7 | Bright |
| Mar | 5.8 | Bright |
| Apr | 6.8 | Intense |
| May | 7.5 | Intense |
| Jun | 8.0 | Intense |
| Jul | 7.6 | Intense |
| Aug | 7.3 | Intense |
| Sep | 6.4 | Intense |
| Oct | 5.1 | Bright |
| Nov | 3.8 | Moderate |
| Dec | 3.3 | Moderate |
Where is Nā’īn?
Nā’īn sits at 32.9°N, 53.1°E, 1,564 m above sea level, in Iran. The nearest listed city is Ardestān, 88 km away.
Topography around Nā’īn
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Nā’īn.
Within 3 km, the terrain around Nā’īn has only modest variations in elevation — a maximum elevation change of 92 m around an average of 1,562 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 656 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,344 m.
The land around Nā’īn is covered by bare terrain (69%) and artificial surfaces (22%) within 3 km, bare terrain (98%) within 16 km, and bare terrain (99%) 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 Nā’īn (32.8601°, 53.0875°, elevation 1,564 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).