Portel weather in November

In November, Portel sees average daytime highs of 33°C and overnight lows near 24°C, with 53 mm of rain across 8.1 wet days and about 12.1 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 19% of the time in November, and the air most often feels oppressive.

Daylight stretches from about 12 h 06 min at the start of November to 12 h 06 min by month's end. Set against the rest of the year, November is Portel's 6th-clearest and 3rd-windiest month. For the whole year in context, see Portel's year-round climate.

Daytime high: 33°; 3rd warmest
Overnight low: 24°; 12th coldest
Rainfall: 53 mm; 8.1 wet days
Daylight: 12 h 06 min; 6:06 AM – 6:11 PM
Cloud cover: 65%; 6th clearest
Wind: 8 km/h; 3rd windiest
Solar energy: 5.91 kWh/m²
Travel score: 3.3; out of 10

Portel is settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← October Portel year-round climate December →Best places to visit in November

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in November

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 33°C through the month.

A typical November day in Portel reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 35°C. Set against its neighbours, November runs on par with October and about 1°C warmer than December.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	34	34	34	34	34	34	34	34	34	34	34	34	34	34	33	33	33	33	33	33	33	33	33	33	33	33	33	33	33	33
Avg low (°C)	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24

	Avg high (°C)	Avg low (°C)
1	34	24
2	34	24
3	34	24
4	34	24
5	34	24
6	34	24
7	34	24
8	34	24
9	34	24
10	34	24
11	34	24
12	34	24
13	34	24
14	34	24
15	33	24
16	33	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

How November really feels in Portel

Once humidity and wind are folded in, November averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in November is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Portel weather by month

How November compares with the rest of the year at a glance. November is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	31° / 24°	237	26.4	12.1	2.7
Feb	30° / 23°	308	26.1	12.1	2.6
Mar	30° / 24°	369	29.4	12	2.6
Apr	30° / 24°	389	29	12	2.5
May	31° / 24°	281	27.3	11.9	2.7
Jun	31° / 23°	141	20.6	11.9	3.2
Jul	32° / 23°	92	16.3	11.9	3.6
Aug	33° / 24°	44	9.5	11.9	3.7
Sep	34° / 24°	26	5.8	12	3.6
Oct	34° / 24°	29	6.3	12	3.4
Nov	33° / 24°	53	8.1	12.1	3.3
Dec	32° / 24°	114	17.3	12.1	3.1

Cloud cover in November

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in November.

Beyond those clear spells, partly cloudy skies cover about 23% of November, with mostly cloudy or overcast conditions the remaining 58%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	51	50	49	48	47	46	45	43	43	42	42	40	41	40	40	39	39	39	39	39	40	40	40	40	40	39	39	39	39	40
Cloudier (%)	49	50	51	52	53	54	55	57	57	58	58	60	59	60	60	61	61	61	61	61	60	60	60	60	60	61	61	61	61	60

	Clearer (%)	Cloudier (%)
1	51	49
2	50	50
3	49	51
4	48	52
5	47	53
6	46	54
7	45	55
8	43	57
9	43	57
10	42	58
11	42	58
12	40	60
13	41	59
14	40	60
15	40	60
16	39	61
17	39	61
18	39	61
19	39	61
20	39	61
21	40	60
22	40	60
23	40	60
24	40	60
25	40	60
26	39	61
27	39	61
28	39	61
29	39	61
30	40	60

Chance of precipitation in November

Any precipitation

Portel gets around 53 mm of rain over 8.1 wet days in November. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 32% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	25	26	26	26	26	27	27	27	27	27	27	28	28	28	28	27	27	27	27	27	27	27	28	28	29	29	30	30	31	32

	Rain chance (%)
1	25
2	26
3	26
4	26
5	26
6	27
7	27
8	27
9	27
10	27
11	27
12	28
13	28
14	28
15	28
16	27
17	27
18	27
19	27
20	27
21	27
22	27
23	28
24	28
25	29
26	29
27	30
28	30
29	31
30	32

Humidity in November

DryComfortableHumidMuggyOppressiveMiserable

Most of November feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, November lands in the oppressive band about 80% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Muggy (%)	4	3	3	3	2	2	2	2	1	1	1	1	2	2	2	2	2	3	3	3	3	4	4	4	4	4	3	3	3	3
Oppressive (%)	84	85	85	85	85	85	85	84	85	84	84	83	82	81	81	80	80	79	78	78	77	76	76	75	75	75	76	76	76	76
Miserable (%)	12	12	12	12	13	13	13	14	14	15	15	16	16	17	17	18	18	18	19	19	20	20	20	21	21	21	21	21	21	21

	Muggy (%)	Oppressive (%)	Miserable (%)
1	4	84	12
2	3	85	12
3	3	85	12
4	3	85	12
5	2	85	13
6	2	85	13
7	2	85	13
8	2	84	14
9	1	85	14
10	1	84	15
11	1	84	15
12	1	83	16
13	2	82	16
14	2	81	17
15	2	81	17
16	2	80	18
17	2	80	18
18	3	79	18
19	3	78	19
20	3	78	19
21	3	77	20
22	4	76	20
23	4	76	20
24	4	75	21
25	4	75	21
26	4	75	21
27	3	76	21
28	3	76	21
29	3	76	21
30	3	76	21

Wind in November

Winds average 8 km/h in November.

Across November, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	9	9	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	9	calm
2	9	calm
3	8	calm
4	8	calm
5	8	calm
6	8	calm
7	8	calm
8	8	calm
9	8	calm
10	8	calm
11	8	calm
12	8	calm
13	8	calm
14	8	calm
15	8	calm
16	8	calm
17	8	calm
18	8	calm
19	8	calm
20	8	calm
21	8	calm
22	8	calm
23	8	calm
24	8	calm
25	8	calm
26	8	calm
27	8	calm
28	8	calm
29	8	calm
30	8	calm

Sunrise & sunset in November

DaylightNight

Daylight runs from about 12 h 06 min at the start of November to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over November. Sunrise moves from 6:05 AM to 6:10 AM, and sunset from 6:09 PM to 6:16 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1
Sunrise (AM)	6:05	6:05	6:05	6:05	6:05	6:05	6:05	6:05	6:05	6:05	6:05	6:05	6:05	6:06	6:06	6:06	6:06	6:06	6:06	6:07	6:07	6:07	6:07	6:08	6:08	6:08	6:09	6:09	6:09	6:10
Sunset (PM)	6:09	6:09	6:09	6:09	6:09	6:09	6:09	6:10	6:10	6:10	6:10	6:10	6:11	6:11	6:11	6:11	6:11	6:12	6:12	6:12	6:13	6:13	6:13	6:14	6:14	6:14	6:15	6:15	6:15	6:16

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.1	6:05	6:09
2	12.1	6:05	6:09
3	12.1	6:05	6:09
4	12.1	6:05	6:09
5	12.1	6:05	6:09
6	12.1	6:05	6:09
7	12.1	6:05	6:09
8	12.1	6:05	6:10
9	12.1	6:05	6:10
10	12.1	6:05	6:10
11	12.1	6:05	6:10
12	12.1	6:05	6:10
13	12.1	6:05	6:11
14	12.1	6:06	6:11
15	12.1	6:06	6:11
16	12.1	6:06	6:11
17	12.1	6:06	6:11
18	12.1	6:06	6:12
19	12.1	6:06	6:12
20	12.1	6:07	6:12
21	12.1	6:07	6:13
22	12.1	6:07	6:13
23	12.1	6:07	6:13
24	12.1	6:08	6:14
25	12.1	6:08	6:14
26	12.1	6:08	6:14
27	12.1	6:09	6:15
28	12.1	6:09	6:15
29	12.1	6:09	6:15
30	12.1	6:10	6:16

Solar energy in November

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in November, about 5.91 kWh/m².

For context, solar energy here swings from a low near 3.92 kWh/m² to a high of 6.36 kWh/m² in October across the year — November's 5.91 kWh/m² sits near the top of that range.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	6.2	6.2	6.1	6.1	6.1	6.1	6.1	6.0	6.0	6.0	6.0	6.0	6.0	6.0	5.9	5.9	5.9	5.9	5.9	5.8	5.8	5.8	5.8	5.8	5.7	5.7	5.7	5.7	5.7	5.6
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	6.2	Intense
2	6.2	Intense
3	6.1	Intense
4	6.1	Intense
5	6.1	Intense
6	6.1	Intense
7	6.1	Intense
8	6.0	Intense
9	6.0	Intense
10	6.0	Intense
11	6.0	Intense
12	6.0	Bright
13	6.0	Bright
14	6.0	Bright
15	5.9	Bright
16	5.9	Bright
17	5.9	Bright
18	5.9	Bright
19	5.9	Bright
20	5.8	Bright
21	5.8	Bright
22	5.8	Bright
23	5.8	Bright
24	5.8	Bright
25	5.7	Bright
26	5.7	Bright
27	5.7	Bright
28	5.7	Bright
29	5.7	Bright
30	5.6	Bright

Planning a trip in November

Hazard calendar for Portel

In seasonPeak

None of Portel's seasonal hazards are active in November. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Portel's monsoon runs January–May, when most of the year's rain falls.

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is November a good time to visit Portel?

Our two travel scores rate November for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.3

Sightseeing

5th-best month of the year

6.2

Beach & pool

4th-best month of the year

November is a weaker month for outdoor sightseeing in Portel. The water and warmth also suit a beach or pool day.

What to pack for Portel in November

From November's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In November, Portel sees daytime highs around 33°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Portel in November

LowModerateHighVery highExtreme

Clear-sky midday UV in November peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Portel peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (extreme).

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)	13	15	15	14	12	10	10	10	12	12	10	10
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	15	Extreme
Mar	15	Extreme
Apr	14	Extreme
May	12	Extreme
Jun	10	Extreme
Jul	10	Very high
Aug	10	Extreme
Sep	12	Extreme
Oct	12	Extreme
Nov	10	Extreme
Dec	10	Extreme

Air quality in Portel in November

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where November falls, not just the annual average.

Air quality in Portel is worst in November — around 22 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (June, 9 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)	15	17	17	14	11	9	10	11	14	19	22	15
Level	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Good	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	15	Moderate
Feb	17	Moderate
Mar	17	Moderate
Apr	14	Moderate
May	11	Good
Jun	9	Good
Jul	10	Good
Aug	11	Good
Sep	14	Moderate
Oct	19	Moderate
Nov	22	Moderate
Dec	15	Moderate

Location & terrain

Where is Portel?

Portel sits at 1.9°S, 50.8°W, 12 m above sea level, in Brazil. The nearest listed city is Melgaço, 19 km away.

Topography around Portel

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Portel.

Within 3 km, the terrain around Portel has only modest variations in elevation — a maximum elevation change of 25 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 37 m; within 80 km, only modest variations in elevation — a maximum elevation change of 75 m.

The land around Portel is covered by water (76%) within 3 km, trees (65%) and water (25%) within 16 km, and trees (90%) within 80 km.

3 km

25 m

water 76%

16 km

37 m

trees 65%

80 km

75 m

trees 90%

treesgrasslandartificial surfaceswaterwetland

← October Portel year-round climate December →Best places to visit in November

November weather nearby: Melgaço 19 km · Breves 47 km · Bagre 68 km · Oeiras do Pará 108 km · Gurupá 108 km · Curralinho 115 km · Anajás 144 km · São Sebastião da Boa Vista 145 km

Brazil travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / N; 127 / 220 V · 60 Hz
Prices: ≈ 46% of US; price level, 2025
GDP per capita: $10,713; 2025
Happiness: 6.6 / 10; World Happiness, 2025
Safe drinking water: 89%; of population, 2024
Homicide rate: 19.3; per 100k, 2023
Road deaths: 16; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Low; EF EPI 482
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 Portel (-1.9356°, -50.8211°, elevation 12 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).

	Avg high (°C)	Avg low (°C)
1	34	24
2	34	24
3	34	24
4	34	24
5	34	24
6	34	24
7	34	24
8	34	24
9	34	24
10	34	24
11	34	24
12	34	24
13	34	24
14	34	24
15	33	24
16	33	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

	Clearer (%)	Cloudier (%)
1	51	49
2	50	50
3	49	51
4	48	52
5	47	53
6	46	54
7	45	55
8	43	57
9	43	57
10	42	58
11	42	58
12	40	60
13	41	59
14	40	60
15	40	60
16	39	61
17	39	61
18	39	61
19	39	61
20	39	61
21	40	60
22	40	60
23	40	60
24	40	60
25	40	60
26	39	61
27	39	61
28	39	61
29	39	61
30	40	60

	Rain chance (%)
1	25
2	26
3	26
4	26
5	26
6	27
7	27
8	27
9	27
10	27
11	27
12	28
13	28
14	28
15	28
16	27
17	27
18	27
19	27
20	27
21	27
22	27
23	28
24	28
25	29
26	29
27	30
28	30
29	31
30	32

	Muggy (%)	Oppressive (%)	Miserable (%)
1	4	84	12
2	3	85	12
3	3	85	12
4	3	85	12
5	2	85	13
6	2	85	13
7	2	85	13
8	2	84	14
9	1	85	14
10	1	84	15
11	1	84	15
12	1	83	16
13	2	82	16
14	2	81	17
15	2	81	17
16	2	80	18
17	2	80	18
18	3	79	18
19	3	78	19
20	3	78	19
21	3	77	20
22	4	76	20
23	4	76	20
24	4	75	21
25	4	75	21
26	4	75	21
27	3	76	21
28	3	76	21
29	3	76	21
30	3	76	21

	Avg high (°C)	Avg low (°C)
1	34	24
2	34	24
3	34	24
4	34	24
5	34	24
6	34	24
7	34	24
8	34	24
9	34	24
10	34	24
11	34	24
12	34	24
13	34	24
14	34	24
15	33	24
16	33	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

	Clearer (%)	Cloudier (%)
1	51	49
2	50	50
3	49	51
4	48	52
5	47	53
6	46	54
7	45	55
8	43	57
9	43	57
10	42	58
11	42	58
12	40	60
13	41	59
14	40	60
15	40	60
16	39	61
17	39	61
18	39	61
19	39	61
20	39	61
21	40	60
22	40	60
23	40	60
24	40	60
25	40	60
26	39	61
27	39	61
28	39	61
29	39	61
30	40	60

	Rain chance (%)
1	25
2	26
3	26
4	26
5	26
6	27
7	27
8	27
9	27
10	27
11	27
12	28
13	28
14	28
15	28
16	27
17	27
18	27
19	27
20	27
21	27
22	27
23	28
24	28
25	29
26	29
27	30
28	30
29	31
30	32

	Muggy (%)	Oppressive (%)	Miserable (%)
1	4	84	12
2	3	85	12
3	3	85	12
4	3	85	12
5	2	85	13
6	2	85	13
7	2	85	13
8	2	84	14
9	1	85	14
10	1	84	15
11	1	84	15
12	1	83	16
13	2	82	16
14	2	81	17
15	2	81	17
16	2	80	18
17	2	80	18
18	3	79	18
19	3	78	19
20	3	78	19
21	3	77	20
22	4	76	20
23	4	76	20
24	4	75	21
25	4	75	21
26	4	75	21
27	3	76	21
28	3	76	21
29	3	76	21
30	3	76	21

	Avg high (°C)	Avg low (°C)
1	34	24
2	34	24
3	34	24
4	34	24
5	34	24
6	34	24
7	34	24
8	34	24
9	34	24
10	34	24
11	34	24
12	34	24
13	34	24
14	34	24
15	33	24
16	33	24
17	33	24
18	33	24
19	33	24
20	33	24
21	33	24
22	33	24
23	33	24
24	33	24
25	33	24
26	33	24
27	33	24
28	33	24
29	33	24
30	33	24

	Clearer (%)	Cloudier (%)
1	51	49
2	50	50
3	49	51
4	48	52
5	47	53
6	46	54
7	45	55
8	43	57
9	43	57
10	42	58
11	42	58
12	40	60
13	41	59
14	40	60
15	40	60
16	39	61
17	39	61
18	39	61
19	39	61
20	39	61
21	40	60
22	40	60
23	40	60
24	40	60
25	40	60
26	39	61
27	39	61
28	39	61
29	39	61
30	40	60

	Rain chance (%)
1	25
2	26
3	26
4	26
5	26
6	27
7	27
8	27
9	27
10	27
11	27
12	28
13	28
14	28
15	28
16	27
17	27
18	27
19	27
20	27
21	27
22	27
23	28
24	28
25	29
26	29
27	30
28	30
29	31
30	32

	Muggy (%)	Oppressive (%)	Miserable (%)
1	4	84	12
2	3	85	12
3	3	85	12
4	3	85	12
5	2	85	13
6	2	85	13
7	2	85	13
8	2	84	14
9	1	85	14
10	1	84	15
11	1	84	15
12	1	83	16
13	2	82	16
14	2	81	17
15	2	81	17
16	2	80	18
17	2	80	18
18	3	79	18
19	3	78	19
20	3	78	19
21	3	77	20
22	4	76	20
23	4	76	20
24	4	75	21
25	4	75	21
26	4	75	21
27	3	76	21
28	3	76	21
29	3	76	21
30	3	76	21