Amqui
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Amqui clear sky chart from 2005-11-06 to 2024-03-06.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	17% 10% 4 8% 8% 5% 6% 5% 5% 6% 26%	77991
	Night	15% 11% 4 9% 9% 5% 6% 6% 5% 6% 25%	81548
Transparency	Day	61% 3 11% 17% 8% 1	77680
	Night	62% 3 10% 16% 7% 1	81394
Seeing	Day	26% 13% 27% 22% 10% 2	15095
	Night	24% 11% 25% 29% 10% 1	23149

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	12% 13% 6% 13% 15% 10% 10% 5% 4 3 8%	2207
	11th to 20th	Day	11% 9% 5% 12% 22% 10% 7% 7% 5% 4 8%	2334
	21st to end	Day	5% 7% 4 13% 9% 8% 9% 8% 8% 7% 21%	2772
February	1st to 10th	Day	8% 13% 5% 8% 10% 7% 12% 7% 7% 5% 19%	1662
	11th to 20th	Day	9% 16% 7% 11% 10% 6% 8% 7% 5% 4 17%	1663
	21st to end	Day	8% 12% 6% 11% 10% 6% 9% 4 5% 8% 21%	1523
March	1st to 10th	Day	12% 11% 6% 10% 9% 6% 8% 6% 6% 6% 20%	1886
	11th to 20th	Day	14% 13% 6% 9% 10% 5% 7% 5% 5% 5% 23%	1980
	21st to end	Day	14% 14% 7% 8% 7% 4 5% 4 5% 6% 28%	2178
April	1st to 10th	Day	18% 12% 6% 8% 7% 5% 6% 5% 4 6% 22%	2182
	11th to 20th	Day	15% 12% 3 7% 7% 4 4 5% 5% 6% 32%	2312
	21st to end	Day	21% 12% 4 8% 6% 3 3 4 4 6% 29%	2340
May	1st to 10th	Day	23% 13% 5% 7% 5% 3 4 3 3 5% 29%	2347
	11th to 20th	Day	21% 10% 3 7% 5% 3 5% 4 4 6% 33%	2565
	21st to end	Day	22% 8% 3 6% 5% 3 4 4 5% 7% 32%	2919
June	1st to 10th	Day	23% 9% 3 6% 6% 4 5% 4 4 6% 30%	2700
	11th to 20th	Day	21% 7% 3 5% 5% 3 4 5% 5% 7% 34%	2700
	21st to end	Day	22% 8% 4 6% 6% 4 5% 5% 7% 7% 25%	2700
July	1st to 10th	Day	18% 7% 3 7% 7% 4 6% 6% 6% 7% 29%	2700
	11th to 20th	Day	15% 6% 4 6% 6% 4 7% 6% 6% 7% 34%	2700
	21st to end	Day	16% 8% 3 6% 6% 4 6% 6% 6% 8% 31%	2830
August	1st to 10th	Day	16% 9% 3 7% 6% 4 6% 6% 6% 8% 27%	2370
	11th to 20th	Day	15% 7% 3 7% 7% 4 6% 5% 5% 8% 32%	2304
	21st to end	Day	16% 7% 3 7% 6% 3 5% 6% 6% 8% 32%	2574
September	1st to 10th	Day	19% 7% 3 6% 6% 3 4 4 5% 6% 36%	2187
	11th to 20th	Day	20% 7% 2 5% 5% 3 4 4 4 5% 42%	1980
	21st to end	Day	18% 9% 3 6% 5% 3 5% 4 5% 7% 35%	1980
October	1st to 10th	Day	16% 10% 3 7% 7% 3 4 4 5% 6% 34%	1854
	11th to 20th	Day	22% 11% 3 8% 6% 3 5% 4 6% 6% 26%	1781
	21st to end	Day	23% 17% 5% 7% 5% 3 4 5% 4 5% 21%	1782
November	1st to 10th	Day	16% 15% 6% 10% 7% 5% 5% 4 5% 5% 22%	1567
	11th to 20th	Day	17% 14% 7% 13% 7% 4 6% 3 4 6% 18%	1520
	21st to end	Day	18% 15% 5% 13% 13% 4 5% 5% 4 5% 14%	1463
December	1st to 10th	Day	17% 12% 5% 15% 15% 6% 6% 5% 4 5% 10%	1330
	11th to 20th	Day	15% 14% 6% 14% 11% 6% 6% 6% 4 4 14%	1668
	21st to end	Day	14% 15% 5% 13% 14% 5% 6% 4 4 4 17%	2431
January	1st to 10th	Night	8% 14% 6% 13% 17% 12% 7% 6% 6% 5% 6%	4748
	11th to 20th	Night	12% 13% 5% 11% 16% 8% 7% 5% 5% 5% 13%	4629
	21st to end	Night	5% 11% 6% 11% 9% 5% 8% 8% 6% 6% 24%	4884
February	1st to 10th	Night	7% 13% 7% 8% 10% 8% 9% 7% 6% 6% 20%	2517
	11th to 20th	Night	11% 14% 5% 10% 8% 5% 8% 7% 6% 5% 19%	2403
	21st to end	Night	10% 12% 5% 10% 7% 7% 9% 5% 6% 6% 24%	1927
March	1st to 10th	Night	11% 12% 6% 8% 9% 4 8% 6% 4 6% 27%	2178
	11th to 20th	Night	13% 14% 5% 9% 9% 4 7% 5% 4 4 26%	1979
	21st to end	Night	13% 13% 5% 8% 7% 5% 5% 4 5% 5% 31%	2178
April	1st to 10th	Night	19% 12% 5% 8% 6% 4 6% 5% 4 5% 24%	1776
	11th to 20th	Night	20% 9% 3 5% 5% 3 4 5% 6% 5% 35%	1598
	21st to end	Night	22% 11% 4 6% 4 2 3 4 5% 6% 34%	1620
May	1st to 10th	Night	20% 13% 4 7% 5% 3 5% 4 5% 5% 28%	1612
	11th to 20th	Night	19% 8% 3 6% 6% 3 5% 5% 5% 6% 35%	1342
	21st to end	Night	17% 7% 3 8% 6% 4 6% 5% 6% 7% 30%	1356
June	1st to 10th	Night	20% 9% 3 7% 5% 4 4 6% 6% 6% 30%	1260
	11th to 20th	Night	19% 6% 3 5% 5% 3 4 6% 6% 7% 38%	1260
	21st to end	Night	21% 7% 4 8% 6% 4 5% 5% 4 5% 31%	1260
July	1st to 10th	Night	16% 8% 4 6% 5% 4 5% 6% 8% 7% 32%	1260
	11th to 20th	Night	14% 5% 3 7% 6% 4 5% 6% 6% 8% 36%	1260
	21st to end	Night	15% 7% 3 6% 6% 3 5% 6% 7% 9% 34%	1485
August	1st to 10th	Night	12% 7% 3 7% 6% 5% 5% 7% 7% 9% 35%	1549
	11th to 20th	Night	14% 7% 2 6% 5% 4 6% 6% 6% 8% 36%	1596
	21st to end	Night	13% 6% 4 5% 5% 4 5% 5% 5% 7% 39%	1782
September	1st to 10th	Night	16% 7% 2 5% 5% 4 5% 4 5% 7% 41%	1770
	11th to 20th	Night	17% 7% 2 5% 5% 4 5% 4 5% 6% 40%	1980
	21st to end	Night	17% 6% 3 4 5% 4 4 4 4 6% 44%	1980
October	1st to 10th	Night	18% 7% 3 6% 5% 3 4 4 4 7% 39%	2106
	11th to 20th	Night	21% 10% 3 6% 6% 4 5% 6% 6% 7% 27%	2178
	21st to end	Night	20% 12% 4 6% 5% 4 5% 5% 6% 7% 26%	2574
November	1st to 10th	Night	19% 10% 5% 8% 6% 4 6% 5% 5% 6% 26%	2510
	11th to 20th	Night	18% 14% 5% 11% 6% 3 6% 5% 5% 6% 22%	2660
	21st to end	Night	17% 14% 5% 13% 10% 5% 6% 5% 6% 5% 15%	2714
December	1st to 10th	Night	18% 15% 6% 12% 11% 5% 8% 6% 4 3 11%	2850
	11th to 20th	Night	19% 13% 5% 11% 13% 8% 7% 6% 5% 4 11%	3531
	21st to end	Night	14% 12% 6% 11% 14% 6% 6% 5% 5% 6% 15%	5236

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	85% 1 7% 6% 1	2208
	11th to 20th	Day	81% 2 5% 8% 3	2334
	21st to end	Day	62% 3 7% 18% 10%	2772
February	1st to 10th	Day	66% 3 9% 15% 6% 1	1662
	11th to 20th	Day	71% 3 8% 13% 4	1671
	21st to end	Day	66% 2 6% 19% 7% 1	1523
March	1st to 10th	Day	65% 3 10% 15% 6% 1	1890
	11th to 20th	Day	66% 3 8% 16% 7% 1	1980
	21st to end	Day	59% 2 8% 18% 11% 1	2178
April	1st to 10th	Day	65% 1 9% 15% 8% 2	2182
	11th to 20th	Day	54% 2 9% 23% 11% 1	2312
	21st to end	Day	59% 2 7% 19% 12% 2	2340
May	1st to 10th	Day	61% 2 7% 17% 12% 2	2347
	11th to 20th	Day	54% 3 9% 22% 12% 1	2569
	21st to end	Day	53% 4 10% 21% 11% 1	2919
June	1st to 10th	Day	58% 3 9% 18% 11% 2	2700
	11th to 20th	Day	50% 4 11% 19% 13% 2	2700
	21st to end	Day	58% 4 12% 16% 9%	2700
July	1st to 10th	Day	54% 3 16% 19% 7%	2625
	11th to 20th	Day	49% 4 15% 22% 9%	2619
	21st to end	Day	52% 4 15% 21% 7%	2672
August	1st to 10th	Day	55% 4 16% 20% 4	2356
	11th to 20th	Day	50% 4 17% 22% 7%	2304
	21st to end	Day	50% 4 16% 23% 7%	2574
September	1st to 10th	Day	50% 3 14% 24% 9%	2187
	11th to 20th	Day	47% 3 14% 26% 9%	1980
	21st to end	Day	51% 3 11% 25% 9%	1980
October	1st to 10th	Day	53% 3 15% 19% 10% 1	1854
	11th to 20th	Day	61% 2 15% 16% 5%	1781
	21st to end	Day	67% 3 8% 17% 5%	1782
November	1st to 10th	Day	66% 2 11% 14% 6%	1567
	11th to 20th	Day	71% 3 10% 12% 3	1520
	21st to end	Day	77% 2 10% 9% 2	1463
December	1st to 10th	Day	80% 3 10% 6% 2	1330
	11th to 20th	Day	77% 2 6% 11% 4	1668
	21st to end	Day	76% 2 8% 8% 6%	2431
January	1st to 10th	Night	83% 2 7% 7% 1	4748
	11th to 20th	Night	77% 2 5% 10% 6%	4629
	21st to end	Night	61% 2 8% 17% 11% 1	4884
February	1st to 10th	Night	64% 4 7% 16% 8% 1	2517
	11th to 20th	Night	67% 3 10% 13% 6%	2406
	21st to end	Night	62% 3 9% 18% 8% 1	1927
March	1st to 10th	Night	61% 2 7% 20% 9%	2187
	11th to 20th	Night	63% 2 7% 17% 9% 1	1980
	21st to end	Night	56% 2 9% 19% 12% 2	2178
April	1st to 10th	Night	64% 2 7% 13% 12% 2	1776
	11th to 20th	Night	51% 2 8% 22% 15% 1	1598
	21st to end	Night	52% 2 8% 22% 14% 2	1620
May	1st to 10th	Night	59% 2 8% 18% 12% 2	1612
	11th to 20th	Night	52% 3 10% 24% 11%	1343
	21st to end	Night	52% 6% 9% 20% 11% 2	1357
June	1st to 10th	Night	54% 3 10% 21% 11% 1	1260
	11th to 20th	Night	45% 4 12% 22% 15% 1	1260
	21st to end	Night	55% 4 11% 18% 11%	1260
July	1st to 10th	Night	49% 5% 16% 24% 6%	1225
	11th to 20th	Night	46% 5% 16% 25% 8% 1	1218
	21st to end	Night	47% 5% 17% 22% 9%	1402
August	1st to 10th	Night	46% 6% 21% 23% 5%	1539
	11th to 20th	Night	46% 6% 21% 20% 7%	1596
	21st to end	Night	44% 5% 16% 28% 7%	1782
September	1st to 10th	Night	46% 2 13% 29% 9% 1	1770
	11th to 20th	Night	47% 3 15% 24% 11% 1	1980
	21st to end	Night	44% 3 12% 26% 14% 1	1980
October	1st to 10th	Night	48% 3 14% 24% 10% 1	2106
	11th to 20th	Night	59% 4 13% 19% 5%	2178
	21st to end	Night	60% 3 14% 17% 5% 1	2574
November	1st to 10th	Night	61% 2 14% 15% 6%	2510
	11th to 20th	Night	68% 3 11% 14% 5%	2660
	21st to end	Night	75% 4 9% 8% 3 1	2714
December	1st to 10th	Night	80% 2 8% 8% 2	2850
	11th to 20th	Night	80% 2 5% 9% 3	3532
	21st to end	Night	74% 1 10% 10% 5% 1	5236

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	25% 19% 29% 21% 4 2	180
	11th to 20th	Day	23% 22% 31% 14% 8% 1	180
	21st to end	Day	14% 22% 32% 23% 6% 4	198
February	1st to 10th	Day	23% 16% 31% 20% 7% 2	322
	11th to 20th	Day	18% 23% 34% 19% 6% 1	366
	21st to end	Day	21% 20% 32% 18% 8% 1	360
March	1st to 10th	Day	21% 17% 31% 23% 7% 1	440
	11th to 20th	Day	26% 17% 26% 20% 9% 1	420
	21st to end	Day	27% 16% 26% 18% 10% 3	462
April	1st to 10th	Day	28% 20% 26% 16% 9% 1	420
	11th to 20th	Day	25% 12% 33% 19% 8% 2	412
	21st to end	Day	32% 12% 24% 23% 6% 3	420
May	1st to 10th	Day	34% 12% 28% 19% 6% 2	430
	11th to 20th	Day	29% 12% 25% 23% 10% 2	624
	21st to end	Day	32% 16% 22% 19% 10% 2	680
June	1st to 10th	Day	30% 12% 24% 23% 10% 1	630
	11th to 20th	Day	27% 12% 24% 22% 13% 2	630
	21st to end	Day	25% 7% 26% 28% 11% 3	630
July	1st to 10th	Day	21% 6% 28% 28% 13% 4	620
	11th to 20th	Day	18% 8% 28% 29% 14% 3	618
	21st to end	Day	19% 7% 27% 31% 13% 3	574
August	1st to 10th	Day	19% 8% 28% 28% 14% 4	446
	11th to 20th	Day	18% 8% 29% 29% 14% 3	439
	21st to end	Day	23% 8% 27% 22% 14% 5%	495
September	1st to 10th	Day	24% 11% 27% 21% 12% 5%	450
	11th to 20th	Day	26% 10% 28% 21% 11% 4	450
	21st to end	Day	28% 14% 25% 18% 12% 4	450
October	1st to 10th	Day	22% 13% 28% 21% 13% 4	387
	11th to 20th	Day	35% 9% 21% 20% 9% 4	360
	21st to end	Day	34% 16% 20% 17% 11% 1	396
November	1st to 10th	Day	30% 15% 28% 19% 6% 2	365
	11th to 20th	Day	28% 15% 29% 20% 9% 1	370
	21st to end	Day	32% 21% 23% 18% 5% 1	313
December	1st to 10th	Day	23% 13% 36% 15% 8% 5%	180
	11th to 20th	Day	24% 28% 28% 16% 4	180
	21st to end	Day	27% 23% 31% 14% 6%	198
January	1st to 10th	Night	22% 12% 31% 28% 6% 1	850
	11th to 20th	Night	23% 15% 29% 27% 5%	812
	21st to end	Night	16% 16% 30% 28% 10% 1	836
February	1st to 10th	Night	17% 15% 30% 28% 8% 1	760
	11th to 20th	Night	23% 12% 33% 23% 9%	743
	21st to end	Night	18% 11% 33% 28% 9% 1	628
March	1st to 10th	Night	21% 10% 30% 30% 7% 1	743
	11th to 20th	Night	25% 14% 29% 21% 9% 2	720
	21st to end	Night	22% 11% 25% 29% 11% 2	792
April	1st to 10th	Night	29% 15% 25% 25% 6%	648
	11th to 20th	Night	27% 10% 23% 30% 9% 1	534
	21st to end	Night	28% 12% 25% 26% 9% 1	540
May	1st to 10th	Night	29% 8% 24% 31% 8% 1	540
	11th to 20th	Night	24% 8% 26% 30% 11% 1	458
	21st to end	Night	22% 8% 27% 32% 10% 1	389
June	1st to 10th	Night	22% 6% 20% 41% 11% 1	360
	11th to 20th	Night	22% 4 21% 36% 16%	360
	21st to end	Night	22% 4 25% 35% 13% 1	360
July	1st to 10th	Night	20% 5% 23% 36% 16% 1	350
	11th to 20th	Night	18% 3 21% 42% 16%	348
	21st to end	Night	18% 5% 16% 39% 21% 1	394
August	1st to 10th	Night	17% 3 18% 39% 21% 1	475
	11th to 20th	Night	19% 4 16% 39% 21% 1	532
	21st to end	Night	19% 4 20% 37% 18% 2	594
September	1st to 10th	Night	22% 5% 26% 34% 12% 2	587
	11th to 20th	Night	23% 7% 22% 32% 15% 2	720
	21st to end	Night	21% 7% 26% 33% 12% 1	720
October	1st to 10th	Night	23% 11% 25% 30% 11% 1	720
	11th to 20th	Night	29% 8% 25% 24% 13% 1	720
	21st to end	Night	29% 14% 22% 24% 9% 1	792
November	1st to 10th	Night	31% 12% 23% 26% 7% 1	789
	11th to 20th	Night	29% 15% 26% 23% 6% 1	850
	21st to end	Night	29% 13% 26% 24% 7% 1	850
December	1st to 10th	Night	29% 12% 27% 24% 7% 1	850
	11th to 20th	Night	28% 18% 25% 22% 7%	850
	21st to end	Night	27% 17% 24% 24% 7% 2	935

Page generated at 2024-03-03 06:28:58. Version ac07

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