Climate and average weather in Sondrio
In Sondrio, the summers are mild, wet, and partly cloudy and the winters are very cold, snowy, and mostly clear.
Over the course of the year, the temperature in Sondrio typically varies from -12°C to 18°C, and is rarely below -20°C or above 22°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 Sondrio for warm-weather activities is from mid June to mid September.
- Hottest
- Jul
- 18°
- Coldest
- Jan
- -12°
- Wettest
- Jun
- 149 mm
- Driest
- Feb
- 51 mm
- Rain / yr
- 1357 mm
- 157 wet days
- Daylight
- 8.4–15.6 h
- shortest–longest
- Elevation
- 307 m
- 46.2°N
- Clearest
- Jan
- 49% cloud
- Air quality
- Elevated
- PM2.5 16.5 µg/m³ · 2019
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Sondrio 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 June to mid September.
Temperature through the year
Daily average highs and lows in Sondrio, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 3.9 months, from May 24 to September 19, with daily high temperatures above 13°C. The hottest month of the year in Sondrio is July, with an average high of 18°C and low of 9°C.
The cool season lasts 3.2 months, from November 25 to March 2, with daily high temperatures below 1°C. The coldest month of the year in Sondrio is January, with an average low of -12°C and high of -3°C.
Days typically run about 9°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | -3 | -1 | 4 | 7 | 12 | 16 | 18 | 18 | 14 | 9 | 3 | -1 |
| Avg low (°C) | -12 | -10 | -5 | -1 | 3 | 7 | 9 | 8 | 5 | 1 | -4 | -10 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | -3 | -12 |
| Feb | -1 | -10 |
| Mar | 4 | -5 |
| Apr | 7 | -1 |
| May | 12 | 3 |
| Jun | 16 | 7 |
| Jul | 18 | 9 |
| Aug | 18 | 8 |
| Sep | 14 | 5 |
| Oct | 9 | 1 |
| Nov | 3 | -4 |
| Dec | -1 | -10 |
How hot and cold Sondrio 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 -16°C (around January 23), with roughly 183 freezing days a year (feels-like at or below 0°C) — 80 of them bitterly cold — worst in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | -3 | -1 | 4 | 7 | 12 | 16 | 18 | 18 | 14 | 9 | 3 | -1 |
| Air high (°C) | -3 | -1 | 4 | 7 | 12 | 16 | 18 | 18 | 14 | 9 | 3 | -1 |
| Feels-like low (°C) | -15 | -12 | -5 | -1 | 3 | 7 | 9 | 8 | 5 | 1 | -4 | -13 |
| Air low (°C) | -12 | -10 | -5 | -1 | 3 | 7 | 9 | 8 | 5 | 1 | -4 | -10 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | -3 | -3 | -15 | -12 |
| Feb | -1 | -1 | -12 | -10 |
| Mar | 4 | 4 | -5 | -5 |
| Apr | 7 | 7 | -1 | -1 |
| May | 12 | 12 | 3 | 3 |
| Jun | 16 | 16 | 7 | 7 |
| Jul | 18 | 18 | 9 | 9 |
| Aug | 18 | 18 | 8 | 8 |
| Sep | 14 | 14 | 5 | 5 |
| Oct | 9 | 9 | 1 | 1 |
| Nov | 3 | 3 | -4 | -4 |
| Dec | -1 | -1 | -13 | -10 |
Average hourly temperature in Sondrio
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 18°C, and coldest before dawn in January, near -12°C.
Sondrio 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 | -3° / -12° | 61 | 7.9 | 8.5 | 8.8 | 0.0 |
| Feb | -1° / -10° | 51 | 7.8 | 8.7 | 10 | 0.0 |
| Mar | 4° / -5° | 72 | 9.5 | 8.6 | 11.6 | 0.0 |
| Apr | 7° / -1° | 113 | 13.8 | 8 | 13.3 | 0.8 |
| May | 12° / 3° | 141 | 17.9 | 2.7 | 14.7 | 2.5 |
| Jun | 16° / 7° | 149 | 18.6 | 0.5 | 15.5 | 4.0 |
| Jul | 18° / 9° | 142 | 18.5 | 0.2 | 15.2 | 4.9 |
| Aug | 18° / 8° | 143 | 17.8 | 0.1 | 14 | 4.8 |
| Sep | 14° / 5° | 124 | 12.7 | 0.9 | 12.3 | 3.7 |
| Oct | 9° / 1° | 140 | 11.9 | 3.9 | 10.7 | 1.8 |
| Nov | 3° / -4° | 142 | 11.4 | 8.8 | 9.2 | 0.1 |
| Dec | -1° / -10° | 78 | 9.3 | 9.5 | 8.5 | 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.
Sondrio gets about 1357 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 5.1 months, from around Apr 13 to Sep 14, peaking in June at about 65% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jan 22.
June is the wettest month by volume, with 149 mm over about 19 wet days; February is the driest, with 51 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 (%) | 26 | 28 | 30 | 46 | 59 | 62 | 60 | 56 | 44 | 39 | 37 | 30 |
| Rain days | 8 | 8 | 10 | 14 | 18 | 19 | 19 | 18 | 13 | 12 | 11 | 9 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 26 | 8 |
| Feb | 28 | 8 |
| Mar | 30 | 10 |
| Apr | 46 | 14 |
| May | 59 | 18 |
| Jun | 62 | 19 |
| Jul | 60 | 19 |
| Aug | 56 | 18 |
| Sep | 44 | 13 |
| Oct | 39 | 12 |
| Nov | 37 | 11 |
| Dec | 30 | 9 |
Monthly rainfall
Over a full year, Sondrio collects about 1357 mm of rain across 157 wet days — roughly 113 mm in an average month.
It doesn’t fall evenly. June is the wettest month with 149 mm, while February is the driest at just 51 mm. The three wettest months alone bring about 32% 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) | 61 | 51 | 72 | 113 | 141 | 149 | 142 | 143 | 124 | 140 | 142 | 78 |
| Rain days | 8 | 8 | 10 | 14 | 18 | 19 | 19 | 18 | 13 | 12 | 11 | 9 |
| Snow days | 9 | 9 | 9 | 8 | 3 | 1 | 0 | 0 | 1 | 4 | 9 | 10 |
| Rainfall (mm) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 61 | 8 | 9 |
| Feb | 51 | 8 | 9 |
| Mar | 72 | 10 | 9 |
| Apr | 113 | 14 | 8 |
| May | 141 | 18 | 3 |
| Jun | 149 | 19 | 1 |
| Jul | 142 | 19 | 0 |
| Aug | 143 | 18 | 0 |
| Sep | 124 | 13 | 1 |
| Oct | 140 | 12 | 4 |
| Nov | 142 | 11 | 9 |
| Dec | 78 | 9 | 10 |
Snow in Sondrio
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.
Sondrio averages about 60 snowy days a year. Snow season runs roughly Sep 3 to Jun 16 — about 9.4 months.
November is snowiest, with roughly 9 days of snow and an estimated 97 cm of snowfall. Over the year that adds up to an estimated 453 cm of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 9 | 9 | 9 | 8 | 3 | 1 | 0 | 0 | 1 | 4 | 9 | 10 |
| Snowfall (cm) | 65 | 52 | 50 | 77 | 11 | 2 | 2 | 0 | 5 | 26 | 97 | 66 |
| Snow days | Snowfall (cm) | |
|---|---|---|
| Jan | 9 | 65 |
| Feb | 9 | 52 |
| Mar | 9 | 50 |
| Apr | 8 | 77 |
| May | 3 | 11 |
| Jun | 1 | 2 |
| Jul | 0 | 2 |
| Aug | 0 | 0 |
| Sep | 1 | 5 |
| Oct | 4 | 26 |
| Nov | 9 | 97 |
| Dec | 10 | 66 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Sondrio, 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 November 23 and lasts for 4.3 months, ending around April 3. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 57% of the time on average.
The cloudier part of the year begins around April 4 and lasts for 2.6 months, ending around June 22. The cloudiest month is May, when it is overcast or mostly cloudy 65% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 57 | 56 | 55 | 43 | 35 | 44 | 55 | 54 | 48 | 44 | 47 | 52 |
| Cloudier (%) | 43 | 44 | 45 | 57 | 65 | 56 | 45 | 46 | 52 | 56 | 53 | 48 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 57 | 43 |
| Feb | 56 | 44 |
| Mar | 55 | 45 |
| Apr | 43 | 57 |
| May | 35 | 65 |
| Jun | 44 | 56 |
| Jul | 55 | 45 |
| Aug | 54 | 46 |
| Sep | 48 | 52 |
| Oct | 44 | 56 |
| Nov | 47 | 53 |
| Dec | 52 | 48 |
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 15 h 36 min of light; the shortest, around December 16, only 8 h 24 min — a swing of roughly 7 h 12 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 8.8 | 10.0 | 11.6 | 13.3 | 14.7 | 15.5 | 15.2 | 14.0 | 12.3 | 10.7 | 9.2 | 8.5 |
| Sunrise (AM) | 8:06 | 7:34 | 6:42 | 5:41 | 4:54 | 4:34 | 4:49 | 5:25 | 6:05 | 6:46 | 7:30 | 8:03 |
| Sunset (PM) | 4:54 | 5:36 | 6:18 | 7:00 | 7:39 | 8:07 | 8:03 | 7:24 | 6:24 | 5:25 | 4:41 | 4:30 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 8.8 | 8:06 | 4:54 |
| Feb | 10.0 | 7:34 | 5:36 |
| Mar | 11.6 | 6:42 | 6:18 |
| Apr | 13.3 | 5:41 | 7:00 |
| May | 14.7 | 4:54 | 7:39 |
| Jun | 15.5 | 4:34 | 8:07 |
| Jul | 15.2 | 4:49 | 8:03 |
| Aug | 14.0 | 5:25 | 7:24 |
| Sep | 12.3 | 6:05 | 6:24 |
| Oct | 10.7 | 6:46 | 5:25 |
| Nov | 9.2 | 7:30 | 4:41 |
| Dec | 8.5 | 8:03 | 4:30 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Sondrio averages about 10 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 5 and 14 days.
The sunnier stretch runs 5.9 months, from around Oct 13 to Apr 10. The sunniest month is January, with roughly 13 sunny days (mixed).
The greyest month is June, down near 6 sunny days — about 54% fewer than the January peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 14 | 12 | 12 | 8 | 6 | 6 | 8 | 9 | 9 | 10 | 10 | 12 |
| Sky | Mixed | Mixed | Mixed | Mixed | Gloomy | Gloomy | Mixed | Mixed | Mixed | Mixed | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 14 | Mixed |
| Feb | 12 | Mixed |
| Mar | 12 | Mixed |
| Apr | 8 | Mixed |
| May | 6 | Gloomy |
| Jun | 6 | Gloomy |
| Jul | 8 | Mixed |
| Aug | 9 | Mixed |
| Sep | 9 | Mixed |
| Oct | 10 | Mixed |
| Nov | 10 | Mixed |
| Dec | 12 | 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 Sondrio, 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 | 99 | 93 | 95 | 100 | 100 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 1 | 7 | 5 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 99 | 1 |
| Jul | 93 | 7 |
| Aug | 95 | 5 |
| Sep | 100 | 0 |
| 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.
Wind in Sondrio is steady company: average speeds sit near 4 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) | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 |
| 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 | 4 | calm |
| Apr | 4 | calm |
| May | 4 | calm |
| Jun | 4 | calm |
| Jul | 4 | calm |
| Aug | 4 | calm |
| Sep | 4 | calm |
| Oct | 4 | calm |
| Nov | 4 | calm |
| Dec | 5 | calm |
Best time to visit Sondrio
To characterize how pleasant the weather is in Sondrio throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early September, Sondrio 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 Sondrio for general outdoor tourist activities is from mid June to mid September, with a peak score in the last week of July.
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 | 0.0 | 0.8 | 2.5 | 4.0 | 4.9 | 4.8 | 3.7 | 1.8 | 0.1 | 0.0 |
| Rating | poor | poor | poor | poor | poor | fair | fair | fair | fair | poor | poor | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 0.0 | poor |
| Feb | 0.0 | poor |
| Mar | 0.0 | poor |
| Apr | 0.8 | poor |
| May | 2.5 | poor |
| Jun | 4.0 | fair |
| Jul | 4.9 | fair |
| Aug | 4.8 | fair |
| Sep | 3.7 | fair |
| Oct | 1.8 | poor |
| Nov | 0.1 | 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 Sondrio for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.
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 Sondrio, 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 18°C), the essentials are rain gear and sun protection. In the cold season around January (highs near -3°C), pack a warm layer and a heavy coat.
In July, Sondrio sees daytime highs around 18°C and nights near 9°C. Pack rain gear. Worth having: sun protection. About 19 days see rain.
UV index (midday) in Sondrio 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 Sondrio peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 3 | 5 | 7 | 8 | 8 | 9 | 8 | 5 | 4 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 5 | Moderate |
| Oct | 4 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Average hourly UV index in Sondrio
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 5.5 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) | 0 | 0 | 5 | 7 | 8 | 8.5 | 8.5 | 7.5 | 5.5 | 2.5 | 0 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 3 | 4.5 | 5 | 5.5 | 4 | 0 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 0 | 0 |
| Mar | 5 | 0 |
| Apr | 7 | 3 |
| May | 8 | 4.5 |
| Jun | 8.5 | 5 |
| Jul | 8.5 | 5.5 |
| Aug | 7.5 | 4 |
| Sep | 5.5 | 0 |
| Oct | 2.5 | 0 |
| Nov | 0 | 0 |
| Dec | 0 | 0 |
Air quality in Sondrio 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 Sondrio is worst in June — around 24 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 10 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Sondrio's WHO annual average of 16.5 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 15 | 20 | 22 | 19 | 24 | 20 | 17 | 14 | 12 | 10 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 15 | Moderate |
| Mar | 20 | Moderate |
| Apr | 22 | Moderate |
| May | 19 | Moderate |
| Jun | 24 | Moderate |
| Jul | 20 | Moderate |
| Aug | 17 | Moderate |
| Sep | 14 | Moderate |
| Oct | 12 | Moderate |
| Nov | 10 | Good |
| Dec | 11 | Good |
Growing season
The growing season in Sondrio typically lasts about 184 days, from around April 24 to October 24 — the span where a frost-free day is more likely than not. It is reliably frost-free from May 20 to September 27.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 2 | 3 | 11 | 36 | 85 | 99 | 100 | 100 | 95 | 64 | 21 | 4 |
| Frost nights | 31 | 28 | 31 | 30 | 21 | 0 | 0 | 0 | 4 | 31 | 30 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 2 | 31 |
| Feb | 3 | 28 |
| Mar | 11 | 31 |
| Apr | 36 | 30 |
| May | 85 | 21 |
| Jun | 99 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 95 | 4 |
| Oct | 64 | 31 |
| Nov | 21 | 30 |
| Dec | 4 | 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. Sondrio banks about 252 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 | 0 | 0 | 47 | 105 | 93 | 7 | 0 | 0 | 0 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 0 |
| Apr | 0 |
| May | 0 |
| Jun | 47 |
| Jul | 105 |
| Aug | 93 |
| Sep | 7 |
| Oct | 0 |
| 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.
Sondrio receives about 3.8 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 1.5 and 5.9 kWh/m².
The brighter stretch of the year lasts 6.3 months, from around Mar 7 to Sep 14. The brightest month is June, averaging about 5.7 kWh/m² (bright).
The dimmest month is December, down near 1.5 kWh/m² — roughly 73% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 1.9 | 2.9 | 4.2 | 5.1 | 5.4 | 5.7 | 5.7 | 4.9 | 3.8 | 2.6 | 1.8 | 1.5 |
| Level | Dim | Moderate | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 1.9 | Dim |
| Feb | 2.9 | Moderate |
| Mar | 4.2 | Bright |
| Apr | 5.1 | Bright |
| May | 5.4 | Bright |
| Jun | 5.7 | Bright |
| Jul | 5.7 | Bright |
| Aug | 4.9 | Bright |
| Sep | 3.8 | Moderate |
| Oct | 2.6 | Moderate |
| Nov | 1.8 | Dim |
| Dec | 1.5 | Dim |
Where is Sondrio?
Sondrio sits at 46.2°N, 9.9°E, 307 m above sea level, in Italy. The nearest listed city is St. Moritz, 37 km away.
Topography around Sondrio
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sondrio.
Within 3 km, the terrain around Sondrio has very significant variations in elevation — a maximum elevation change of 1,233 m around an average of 579 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 3,338 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,874 m.
The land around Sondrio is covered by trees (70%) within 3 km, trees (55%) and grassland (29%) within 16 km, and trees (49%) and grassland (27%) within 80 km.
Italy travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F / L
- 230 V · 50 Hz
- Prices
- ≈ 69% of US
- price level, 2025
- GDP per capita
- $43,309
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 5.3
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 513
- 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 Sondrio (46.1685°, 9.8713°, elevation 307 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).