Climate and average weather in Jablonec nad Nisou
In Jablonec nad Nisou, the summers are mild, wet, and partly cloudy and the winters are very cold, snowy, and mostly cloudy.
Over the course of the year, the temperature in Jablonec nad Nisou typically varies from -5°C to 21°C, and is rarely below -14°C or above 28°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 Jablonec nad Nisou for warm-weather activities is from late May to mid September.
- Hottest
- Jul
- 21°
- Coldest
- Jan
- -5°
- Wettest
- Jul
- 129 mm
- Driest
- Apr
- 59 mm
- Rain / yr
- 1041 mm
- 166 wet days
- Daylight
- 7.7–16.3 h
- shortest–longest
- Elevation
- 475 m
- 50.7°N
- Clearest
- Aug
- 61% cloud
Jablonec nad Nisou is city in Czechia.
- Air quality
- Good
- PM10 15.8 µg/m³ · 2019
- Density
- 1,472/km²
- people per km²
- Founded
- 1356
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Jablonec nad Nisou 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 September.
Temperature through the year
Daily average highs and lows in Jablonec nad Nisou, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 3.8 months, from May 21 to September 13, with daily high temperatures above 16°C. The hottest month of the year in Jablonec nad Nisou is July, with an average high of 21°C and low of 12°C.
The cool season lasts 3.6 months, from November 19 to March 7, with daily high temperatures below 4°C. The coldest month of the year in Jablonec nad Nisou is January, with an average low of -5°C and high of -0°C.
Days typically run about 7°C warmer than nights, with the widest day–night swing (around 9°C) in August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 1 | 5 | 11 | 16 | 19 | 21 | 21 | 16 | 11 | 5 | 1 |
| Avg low (°C) | -5 | -4 | -2 | 2 | 7 | 10 | 12 | 12 | 8 | 4 | 0 | -4 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 0 | -5 |
| Feb | 1 | -4 |
| Mar | 5 | -2 |
| Apr | 11 | 2 |
| May | 16 | 7 |
| Jun | 19 | 10 |
| Jul | 21 | 12 |
| Aug | 21 | 12 |
| Sep | 16 | 8 |
| Oct | 11 | 4 |
| Nov | 5 | 0 |
| Dec | 1 | -4 |
How hot and cold Jablonec nad Nisou 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 -11°C (around January 27), with roughly 179 freezing days a year (feels-like at or below 0°C) — 17 of them bitterly cold — worst in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 0 | 1 | 5 | 11 | 16 | 19 | 21 | 21 | 16 | 10 | 5 | 0 |
| Air high (°C) | 0 | 1 | 5 | 11 | 16 | 19 | 21 | 21 | 16 | 11 | 5 | 1 |
| Feels-like low (°C) | -10 | -9 | -6 | -1 | 5 | 9 | 12 | 12 | 6 | 1 | -4 | -8 |
| Air low (°C) | -5 | -4 | -2 | 2 | 7 | 10 | 12 | 12 | 8 | 4 | 0 | -4 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 0 | 0 | -10 | -5 |
| Feb | 1 | 1 | -9 | -4 |
| Mar | 5 | 5 | -6 | -2 |
| Apr | 11 | 11 | -1 | 2 |
| May | 16 | 16 | 5 | 7 |
| Jun | 19 | 19 | 9 | 10 |
| Jul | 21 | 21 | 12 | 12 |
| Aug | 21 | 21 | 12 | 12 |
| Sep | 16 | 16 | 6 | 8 |
| Oct | 10 | 11 | 1 | 4 |
| Nov | 5 | 5 | -4 | 0 |
| Dec | 0 | 1 | -8 | -4 |
Average hourly temperature in Jablonec nad Nisou
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 21°C, and coldest before dawn in January, near -5°C.
Jablonec nad Nisou 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 | -0° / -5° | 88 | 14.5 | 11.9 | 8.2 | 0.0 |
| Feb | 1° / -4° | 69 | 12.1 | 9.2 | 9.7 | 0.0 |
| Mar | 5° / -2° | 81 | 14.1 | 8.4 | 11.5 | 0.3 |
| Apr | 11° / 2° | 59 | 12.4 | 2.9 | 13.5 | 2.6 |
| May | 16° / 7° | 93 | 15.2 | 0.2 | 15.2 | 4.4 |
| Jun | 19° / 10° | 105 | 15.6 | 0 | 16.2 | 5.2 |
| Jul | 21° / 12° | 129 | 16.5 | 0 | 15.8 | 5.5 |
| Aug | 21° / 12° | 105 | 14.4 | 0 | 14.3 | 5.8 |
| Sep | 16° / 8° | 86 | 12.4 | 0 | 12.4 | 4.6 |
| Oct | 11° / 4° | 74 | 12 | 1.1 | 10.4 | 2.3 |
| Nov | 5° / 0° | 73 | 12.2 | 5.6 | 8.7 | 0.2 |
| Dec | 1° / -4° | 81 | 14.2 | 11.3 | 7.8 | 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.
Jablonec nad Nisou gets about 1041 mm of precipitation a year. On a typical day the chance of rain is very wet, but that rises and falls sharply with the seasons.
The wetter season lasts 4.2 months, from around May 1 to Sep 6, peaking in July at about 56% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Oct 16.
July is the wettest month by volume, with 129 mm over about 17 wet days; April is the driest, with 59 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 (%) | 46 | 44 | 45 | 42 | 49 | 52 | 53 | 46 | 42 | 39 | 41 | 46 |
| Rain days | 15 | 12 | 14 | 12 | 15 | 16 | 17 | 14 | 12 | 12 | 12 | 14 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 46 | 15 |
| Feb | 44 | 12 |
| Mar | 45 | 14 |
| Apr | 42 | 12 |
| May | 49 | 15 |
| Jun | 52 | 16 |
| Jul | 53 | 17 |
| Aug | 46 | 14 |
| Sep | 42 | 12 |
| Oct | 39 | 12 |
| Nov | 41 | 12 |
| Dec | 46 | 14 |
Monthly rainfall
Over a full year, Jablonec nad Nisou collects about 1041 mm of rain across 166 wet days — roughly 87 mm in an average month.
It doesn’t fall evenly. July is the wettest month with 129 mm, while April is the driest at just 59 mm. The three wettest months alone bring about 33% 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) | 88 | 69 | 81 | 59 | 93 | 105 | 129 | 105 | 86 | 74 | 73 | 81 |
| Rain days | 15 | 12 | 14 | 12 | 15 | 16 | 17 | 14 | 12 | 12 | 12 | 14 |
| Snow days | 12 | 9 | 8 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 6 | 11 |
| Rainfall (mm) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 88 | 15 | 12 |
| Feb | 69 | 12 | 9 |
| Mar | 81 | 14 | 8 |
| Apr | 59 | 12 | 3 |
| May | 93 | 15 | 0 |
| Jun | 105 | 16 | 0 |
| Jul | 129 | 17 | 0 |
| Aug | 105 | 14 | 0 |
| Sep | 86 | 12 | 0 |
| Oct | 74 | 12 | 1 |
| Nov | 73 | 12 | 6 |
| Dec | 81 | 14 | 11 |
Snow in Jablonec nad Nisou
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.
Jablonec nad Nisou averages about 51 snowy days a year. Snow season runs roughly Oct 8 to May 2 — about 6.8 months.
December is snowiest, with roughly 11 days of snow and an estimated 53 cm of snowfall. Over the year that adds up to an estimated 250 cm of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 12 | 9 | 8 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 6 | 11 |
| Snowfall (cm) | 56 | 53 | 38 | 14 | 1 | 0 | 0 | 0 | 0 | 6 | 29 | 53 |
| Snow days | Snowfall (cm) | |
|---|---|---|
| Jan | 12 | 56 |
| Feb | 9 | 53 |
| Mar | 8 | 38 |
| Apr | 3 | 14 |
| May | 0 | 1 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 1 | 6 |
| Nov | 6 | 29 |
| Dec | 11 | 53 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Jablonec nad Nisou, 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 March 23 and lasts for 6.2 months, ending around September 28. The clearest month is August, when the sky is clear, mostly clear, or partly cloudy 44% of the time on average.
The cloudier part of the year begins around September 29 and lasts for 5.7 months, ending around March 22. The cloudiest month is November, when it is overcast or mostly cloudy 80% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 25 | 27 | 30 | 38 | 35 | 36 | 41 | 44 | 35 | 30 | 20 | 20 |
| Cloudier (%) | 75 | 73 | 70 | 62 | 65 | 64 | 59 | 56 | 65 | 70 | 80 | 80 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 25 | 75 |
| Feb | 27 | 73 |
| Mar | 30 | 70 |
| Apr | 38 | 62 |
| May | 35 | 65 |
| Jun | 36 | 64 |
| Jul | 41 | 59 |
| Aug | 44 | 56 |
| Sep | 35 | 65 |
| Oct | 30 | 70 |
| Nov | 20 | 80 |
| Dec | 20 | 80 |
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 18, brings about 16 h 18 min of light; the shortest, around December 18, only 7 h 42 min — a swing of roughly 8 h 36 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 8.2 | 9.7 | 11.5 | 13.5 | 15.2 | 16.2 | 15.8 | 14.3 | 12.4 | 10.4 | 8.7 | 7.8 |
| Sunrise (AM) | 8:03 | 7:23 | 6:23 | 5:13 | 4:18 | 3:52 | 4:09 | 4:53 | 5:42 | 6:32 | 7:25 | 8:03 |
| Sunset (PM) | 4:15 | 5:05 | 5:55 | 6:46 | 7:34 | 8:07 | 8:00 | 7:14 | 6:05 | 4:57 | 4:04 | 3:48 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 8.2 | 8:03 | 4:15 |
| Feb | 9.7 | 7:23 | 5:05 |
| Mar | 11.5 | 6:23 | 5:55 |
| Apr | 13.5 | 5:13 | 6:46 |
| May | 15.2 | 4:18 | 7:34 |
| Jun | 16.2 | 3:52 | 8:07 |
| Jul | 15.8 | 4:09 | 8:00 |
| Aug | 14.3 | 4:53 | 7:14 |
| Sep | 12.4 | 5:42 | 6:05 |
| Oct | 10.4 | 6:32 | 4:57 |
| Nov | 8.7 | 7:25 | 4:04 |
| Dec | 7.8 | 8:03 | 3:48 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Jablonec nad Nisou averages about 5 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 2 and 8 days.
The sunnier stretch runs 4.1 months, from around Jun 24 to Oct 26. The sunniest month is August, with roughly 7 sunny days (gloomy).
The greyest month is November, down near 3 sunny days — about 56% fewer than the August peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 4 | 4 | 6 | 7 | 6 | 5 | 7 | 7 | 6 | 6 | 3 | 4 |
| Sky | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 4 | Gloomy |
| Feb | 4 | Gloomy |
| Mar | 6 | Gloomy |
| Apr | 7 | Gloomy |
| May | 6 | Gloomy |
| Jun | 5 | Gloomy |
| Jul | 7 | Gloomy |
| Aug | 7 | Gloomy |
| Sep | 6 | Gloomy |
| Oct | 6 | Gloomy |
| Nov | 3 | Gloomy |
| Dec | 4 | Gloomy |
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 Jablonec nad Nisou, the air stays dry or comfortable essentially all year. Even in August, the muggiest month, it feels humid or worse only about 8% 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 | 96 | 80 | 62 | 63 | 91 | 100 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 4 | 16 | 29 | 30 | 9 | 0 | 0 | 0 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 4 | 8 | 8 | 1 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| Jan | 100 | 0 | 0 |
| Feb | 100 | 0 | 0 |
| Mar | 100 | 0 | 0 |
| Apr | 100 | 0 | 0 |
| May | 96 | 4 | 0 |
| Jun | 80 | 16 | 4 |
| Jul | 62 | 29 | 8 |
| Aug | 63 | 30 | 8 |
| Sep | 91 | 9 | 1 |
| Oct | 100 | 0 | 0 |
| Nov | 100 | 0 | 0 |
| Dec | 100 | 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.
Across the year, average wind speed in Jablonec nad Nisou is typically calm, near 11 km/h, and varies little with the seasons.
The windier part of the year lasts 6.2 months, from around Oct 9 to Apr 16. The windiest month is January, averaging about 12 km/h (calm).
The calmer part of the year runs from around Apr 17 to Oct 8, with August the calmest month at about 9 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 12 | 12 | 12 | 11 | 10 | 10 | 9 | 9 | 10 | 11 | 11 | 12 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 12 | calm |
| Feb | 12 | calm |
| Mar | 12 | calm |
| Apr | 11 | calm |
| May | 10 | calm |
| Jun | 10 | calm |
| Jul | 9 | calm |
| Aug | 9 | calm |
| Sep | 10 | calm |
| Oct | 11 | calm |
| Nov | 11 | calm |
| Dec | 12 | calm |
Best time to visit Jablonec nad Nisou
To characterize how pleasant the weather is in Jablonec nad Nisou throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early June, Jablonec nad Nisou 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 Jablonec nad Nisou for general outdoor tourist activities is from late May to mid September, with a peak score in the first week of August.
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 | 0.3 | 2.5 | 4.4 | 5.2 | 5.5 | 5.8 | 4.6 | 2.3 | 0.3 | 0.0 |
| Rating | poor | poor | poor | poor | fair | fair | good | good | fair | poor | poor | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 0.0 | poor |
| Feb | 0.0 | poor |
| Mar | 0.3 | poor |
| Apr | 2.5 | poor |
| May | 4.4 | fair |
| Jun | 5.2 | fair |
| Jul | 5.5 | good |
| Aug | 5.8 | good |
| Sep | 4.6 | fair |
| Oct | 2.3 | poor |
| Nov | 0.3 | 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 Jablonec nad Nisou for hot-weather activities is from mid July to late August, 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 Jablonec nad Nisou, 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 21°C), the essentials are rain gear and sun protection. In the cold season around January (highs near -0°C), pack a warm layer, a heavy coat and rain gear.
In July, Jablonec nad Nisou sees daytime highs around 21°C and nights near 12°C. Pack rain gear. Worth having: sun protection. About 17 days see rain.
UV index (midday) in Jablonec nad Nisou 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 Jablonec nad Nisou peaks around June 20 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 7 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 4 | 6 | 7 | 7 | 6 | 5 | 2 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | Very high | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 4 | Moderate |
| Apr | 4 | Moderate |
| May | 6 | High |
| Jun | 7 | Very high |
| Jul | 7 | High |
| Aug | 6 | High |
| Sep | 5 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Average hourly UV index in Jablonec nad Nisou
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 June the burn window is concentrated in the middle of the day: about 8 hours a day reach index 3 (protection recommended), and 4 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 | 3 | 4.5 | 7 | 8 | 7.5 | 6.5 | 4.5 | 0 | 0 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 0 | 0 | 4 | 3 | 0.5 | 0 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 0 | 0 |
| Mar | 3 | 0 |
| Apr | 4.5 | 0 |
| May | 7 | 0 |
| Jun | 8 | 4 |
| Jul | 7.5 | 3 |
| Aug | 6.5 | 0.5 |
| Sep | 4.5 | 0 |
| Oct | 0 | 0 |
| Nov | 0 | 0 |
| Dec | 0 | 0 |
Air quality in Jablonec nad Nisou 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 Jablonec nad Nisou is worst in June — around 18 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 14 | 17 | 17 | 16 | 18 | 16 | 17 | 15 | 13 | 12 | 12 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 14 | Moderate |
| Mar | 17 | Moderate |
| Apr | 17 | Moderate |
| May | 16 | Moderate |
| Jun | 18 | Moderate |
| Jul | 16 | Moderate |
| Aug | 17 | Moderate |
| Sep | 15 | Moderate |
| Oct | 13 | Moderate |
| Nov | 12 | Good |
| Dec | 12 | Good |
Growing season
The growing season in Jablonec nad Nisou typically lasts about 229 days, from around April 1 to November 15 — the span where a frost-free day is more likely than not. It is reliably frost-free from April 29 to October 9.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 16 | 18 | 35 | 73 | 97 | 100 | 100 | 100 | 99 | 84 | 51 | 22 |
| Frost nights | 31 | 28 | 31 | 27 | 0 | 0 | 0 | 0 | 0 | 23 | 30 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 16 | 31 |
| Feb | 18 | 28 |
| Mar | 35 | 31 |
| Apr | 73 | 27 |
| May | 97 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 99 | 0 |
| Oct | 84 | 23 |
| Nov | 51 | 30 |
| 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. Jablonec nad Nisou banks about 633 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 | 44 | 135 | 200 | 193 | 61 | 0 | 0 | 0 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 0 |
| Apr | 0 |
| May | 44 |
| Jun | 135 |
| Jul | 200 |
| Aug | 193 |
| Sep | 61 |
| 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.
Jablonec nad Nisou receives about 3.1 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 0.7 and 5.3 kWh/m².
The brighter stretch of the year lasts 5.9 months, from around Mar 20 to Sep 16. The brightest month is June, averaging about 5.3 kWh/m² (bright).
The dimmest month is December, down near 0.7 kWh/m² — roughly 87% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 0.9 | 1.7 | 2.9 | 4.4 | 5.1 | 5.3 | 5.2 | 4.5 | 3.1 | 1.9 | 1.0 | 0.7 |
| Level | Dim | Dim | Moderate | Bright | Bright | Bright | Bright | Bright | Moderate | Dim | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 0.9 | Dim |
| Feb | 1.7 | Dim |
| Mar | 2.9 | Moderate |
| Apr | 4.4 | Bright |
| May | 5.1 | Bright |
| Jun | 5.3 | Bright |
| Jul | 5.2 | Bright |
| Aug | 4.5 | Bright |
| Sep | 3.1 | Moderate |
| Oct | 1.9 | Dim |
| Nov | 1.0 | Dim |
| Dec | 0.7 | Dim |
Where is Jablonec nad Nisou?
Jablonec nad Nisou sits at 50.7°N, 15.2°E, 475 m above sea level, in Czechia. The nearest listed city is Liberec, 9.0 km away.
Topography around Jablonec nad Nisou
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Jablonec nad Nisou.
Within 3 km, the terrain around Jablonec nad Nisou has significant variations in elevation — a maximum elevation change of 362 m around an average of 552 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 860 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,572 m.
The land around Jablonec nad Nisou is covered by trees (69%) within 3 km, trees (69%) within 16 km, and trees (45%) and cropland (34%) within 80 km.
Czechia travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E
- 230 V · 50 Hz
- Prices
- ≈ 59% of US
- price level, 2025
- GDP per capita
- $35,917
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 0.8
- per 100k, 2023
- Road deaths
- 5.9
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- High
- EF EPI 582
- 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 Jablonec nad Nisou (50.7243°, 15.1711°, elevation 475 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).