Garmdarreh, Iran Climate
The warmest month is July, with an average high of 38°C; the coldest is January, with an average low of -1°C. A normal year brings 267 mm of precipitation.
Temperature through the year
The normal daily high and low and the record for every date at Tehran-Mehrabad, since 1943. The line marks today.
- Normal low
- Normal high
- Record high
- Record low
Normals for Sep 27
- Normal high
- 30°C
- Normal low
- 16°C
- Record high
- 35°Cin 2019
- Record low
- 13°Cin 1991
- Chance of a wet day
- 14%
- Daylight
- 11 h 59 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Record high | Record low | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 9°C | -1°C | 21°C (2015) | -13°C (1973) | 28 mm | 6.2 |
| February | 12°C | 0°C | 24°C (2016) | -10°C (1967) | 31 mm | 5.7 |
| March | 17°C | 4°C | 30°C (2018) | -9°C (1980) | 37 mm | 6.2 |
| April | 23°C | 9°C | 33°C (2008) | -3°C (2014) | 33 mm | 6.0 |
| May | 29°C | 15°C | 37°C (2025) | 0°C (2010) | 16 mm | 3.1 |
| June | 35°C | 20°C | 42°C (2015) | 12°C (1994) | 6 mm | 0.0 |
| July | 38°C | 23°C | 43°C (1975) | 14°C (1968) | 6 mm | 0.0 |
| August | 37°C | 23°C | 42°C (2024) | 14°C (1957) | 6 mm | 3.1 |
| September | 32°C | 18°C | 39°C (1979) | 11°C (1955) | 12 mm | 3.0 |
| October | 25°C | 13°C | 33°C (2002) | 2°C (1977) | 28 mm | 6.2 |
| November | 16°C | 5°C | 27°C (2012) | -7°C (1958) | 36 mm | 6.0 |
| December | 11°C | 1°C | 21°C (2005) | -11°C (2003) | 28 mm | 6.2 |
| Year | 23°C | 11°C | 267 mm | 52 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
267 mm in a normal year, most in March.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Garmdarreh.
Days with a mean dew point of 18°C or more are rare here in every month.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | -5°C | 57% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | -4°C | 54% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | -1°C | 50% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | 2°C | 46% | 100% | 0% | 0% | 0% | 0% | 0% |
| May | 4°C | 37% | 100% | 0% | 0% | 0% | 0% | 0% |
| June | 4°C | 25% | 100% | 0% | 0% | 0% | 0% | 0% |
| July | 5°C | 23% | 100% | 0% | 0% | 0% | 0% | 0% |
| August | 4°C | 23% | 100% | 0% | 0% | 0% | 0% | 0% |
| September | 3°C | 27% | 100% | 0% | 0% | 0% | 0% | 0% |
| October | 2°C | 39% | 100% | 0% | 0% | 0% | 0% | 0% |
| November | -1°C | 52% | 100% | 0% | 0% | 0% | 0% | 0% |
| December | -3°C | 57% | 100% | 0% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is September, with the sky 27 percent covered on average; the cloudiest is April, at 62 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is July, averaging 13.3 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 15, with 14 h 35 min of daylight; the shortest is Dec 17, with 9 h 44 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Garmdarreh in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
A record is the highest or lowest value on the date in every year the station has reported, back to 1943. It rests on one station, so a neighbor a few miles away can hold different ones.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Records: NOAA GHCN-Daily, station IR000407540, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.