Hot Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hot Springs clear sky chart from 2005-11-06 to 2024-01-14.

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	8% 6% 2 4 4 3 4 4 5% 8% 52%	74818
	Night	7% 6% 2 5% 4 3 4 4 5% 7% 51%	74961
Transparency	Day	30% 6% 15% 27% 17% 5%	74522
	Night	31% 6% 15% 27% 17% 4	74779
Seeing	Day	11% 12% 31% 30% 14% 2	14699
	Night	10% 9% 34% 37% 11% 1	24816

By Month

Percentage Cloud Cover SW (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	3 7% 2 5% 6% 4 4 5% 6% 8% 50%	1518
	11th to 20th	Day	5% 7% 2 6% 5% 3 4 4 5% 7% 50%	1464
	21st to end	Day	6% 9% 4 6% 5% 2 5% 4 5% 8% 47%	1598
February	1st to 10th	Day	6% 9% 5% 7% 6% 4 4 5% 4 6% 41%	1620
	11th to 20th	Day	6% 7% 4 8% 6% 3 4 5% 5% 7% 44%	1726
	21st to end	Day	5% 9% 3 6% 4 3 6% 5% 6% 7% 46%	1480
March	1st to 10th	Day	7% 9% 3 5% 3 3 4 3 5% 8% 51%	1800
	11th to 20th	Day	8% 6% 2 4 5% 2 4 4 6% 8% 50%	1844
	21st to end	Day	11% 8% 4 6% 4 3 4 5% 6% 9% 40%	2376
April	1st to 10th	Day	11% 10% 3 4 4 2 3 4 5% 8% 46%	2160
	11th to 20th	Day	13% 9% 3 6% 5% 3 5% 5% 4 7% 40%	2131
	21st to end	Day	15% 6% 3 5% 5% 3 4 4 5% 8% 42%	2273
May	1st to 10th	Day	13% 5% 3 6% 4 3 4 5% 6% 8% 43%	2373
	11th to 20th	Day	16% 6% 2 5% 5% 4 4 6% 6% 8% 38%	2478
	21st to end	Day	16% 6% 2 4 4 3 5% 6% 6% 8% 41%	2724
June	1st to 10th	Day	9% 3 2 4 4 2 4 5% 7% 9% 52%	2520
	11th to 20th	Day	9% 4 1 3 4 2 4 5% 6% 9% 53%	2520
	21st to end	Day	5% 3 1 2 3 1 3 5% 6% 8% 62%	2520
July	1st to 10th	Day	5% 3 1 3 4 3 5% 6% 6% 9% 55%	2520
	11th to 20th	Day	4 2 2 2 3 2 3 4 6% 9% 64%	2520
	21st to end	Day	6% 2 1 3 3 2 5% 4 6% 10% 58%	2742
August	1st to 10th	Day	5% 3 1 3 5% 3 5% 6% 7% 10% 53%	2507
	11th to 20th	Day	4 2 1 3 3 3 4 4 7% 8% 62%	2179
	21st to end	Day	6% 3 1 2 3 2 3 4 7% 8% 61%	2376
September	1st to 10th	Day	6% 3 2 3 3 2 3 4 4 7% 63%	2160
	11th to 20th	Day	8% 3 2 2 3 2 2 3 5% 7% 64%	2084
	21st to end	Day	10% 4 1 3 3 2 2 3 3 6% 63%	1980
October	1st to 10th	Day	12% 6% 2 4 3 2 3 3 4 6% 54%	1890
	11th to 20th	Day	10% 5% 2 3 2 2 3 3 4 7% 59%	1781
	21st to end	Day	7% 5% 2 4 4 3 4 4 5% 7% 55%	1782
November	1st to 10th	Day	6% 7% 2 4 3 2 5% 5% 5% 9% 53%	1673
	11th to 20th	Day	4 7% 2 4 3 3 4 4 6% 7% 57%	1710
	21st to end	Day	5% 7% 3 5% 4 2 3 3 5% 7% 55%	1549
December	1st to 10th	Day	4 8% 3 3 4 4 5% 6% 5% 8% 51%	1520
	11th to 20th	Day	4 4 2 5% 4 3 5% 4 5% 7% 58%	1926
	21st to end	Day	7% 10% 3 6% 5% 3 4 3 4 5% 49%	2794
January	1st to 10th	Night	4 8% 3 7% 6% 3 5% 4 5% 6% 50%	2647
	11th to 20th	Night	4 6% 3 7% 5% 2 4 5% 6% 8% 50%	2569
	21st to end	Night	5% 8% 3 7% 5% 3 5% 5% 5% 7% 46%	2772
February	1st to 10th	Night	5% 9% 5% 8% 5% 4 5% 5% 4 7% 43%	2340
	11th to 20th	Night	4 9% 3 7% 5% 4 5% 5% 6% 7% 45%	2120
	21st to end	Night	6% 9% 4 7% 5% 3 4 4 5% 6% 47%	1776
March	1st to 10th	Night	7% 6% 3 5% 5% 2 4 4 6% 8% 50%	2160
	11th to 20th	Night	7% 6% 3 5% 5% 3 5% 6% 6% 8% 49%	2112
	21st to end	Night	13% 7% 3 5% 4 3 4 4 6% 10% 41%	1980
April	1st to 10th	Night	13% 7% 3 4 4 2 4 4 7% 7% 45%	1800
	11th to 20th	Night	14% 8% 3 5% 5% 3 4 4 5% 7% 43%	1777
	21st to end	Night	14% 6% 2 4 6% 3 4 5% 5% 7% 42%	1685
May	1st to 10th	Night	13% 4 3 4 5% 2 4 5% 6% 6% 46%	1584
	11th to 20th	Night	15% 6% 3 5% 3 3 4 5% 4 8% 44%	1417
	21st to end	Night	17% 5% 2 4 4 2 5% 4 5% 8% 45%	1552
June	1st to 10th	Night	8% 4 2 4 4 2 5% 5% 7% 10% 48%	1440
	11th to 20th	Night	11% 3 1 4 4 3 4 6% 6% 8% 49%	1440
	21st to end	Night	5% 3 1 3 4 2 4 4 6% 8% 60%	1440
July	1st to 10th	Night	5% 4 2 4 5% 3 5% 5% 5% 9% 53%	1440
	11th to 20th	Night	4 2 1 2 3 2 4 5% 5% 7% 65%	1440
	21st to end	Night	4 3 2 4 4 2 4 5% 6% 9% 59%	1576
August	1st to 10th	Night	3 3 2 5% 5% 3 5% 6% 8% 9% 51%	1432
	11th to 20th	Night	3 3 1 3 4 3 3 3 5% 8% 64%	1718
	21st to end	Night	3 3 2 3 4 3 4 5% 5% 8% 61%	1980
September	1st to 10th	Night	8% 2 1 4 4 2 4 3 4 5% 62%	1800
	11th to 20th	Night	7% 3 1 4 3 2 3 4 4 8% 60%	1876
	21st to end	Night	11% 3 1 3 3 3 3 3 3 5% 62%	1980
October	1st to 10th	Night	12% 6% 2 3 4 2 4 4 4 6% 53%	2065
	11th to 20th	Night	10% 6% 2 4 3 2 3 3 5% 5% 56%	2160
	21st to end	Night	9% 6% 1 4 4 3 3 4 5% 7% 53%	2574
November	1st to 10th	Night	8% 6% 2 5% 4 2 4 4 6% 7% 52%	2405
	11th to 20th	Night	6% 5% 2 5% 4 3 4 4 5% 7% 55%	2470
	21st to end	Night	4 7% 2 4 5% 2 4 4 5% 8% 55%	2630
December	1st to 10th	Night	4 7% 3 6% 5% 4 4 4 6% 7% 51%	2660
	11th to 20th	Night	3 6% 2 5% 6% 3 5% 5% 5% 7% 53%	3271
	21st to end	Night	9% 11% 3 5% 4 2 3 4 5% 6% 48%	4873

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	30% 7% 21% 29% 13% 1	1519
	11th to 20th	Day	31% 8% 19% 27% 12% 2	1464
	21st to end	Day	33% 7% 22% 24% 11% 2	1598
February	1st to 10th	Day	42% 6% 14% 23% 13% 2	1620
	11th to 20th	Day	39% 7% 16% 22% 12% 4	1736
	21st to end	Day	35% 6% 18% 25% 14% 3	1480
March	1st to 10th	Day	32% 5% 17% 29% 14% 2	1800
	11th to 20th	Day	31% 6% 16% 30% 15% 2	1844
	21st to end	Day	40% 9% 14% 26% 11% 1	2376
April	1st to 10th	Day	37% 6% 17% 24% 11% 4	2160
	11th to 20th	Day	42% 6% 13% 22% 15% 2	2134
	21st to end	Day	39% 5% 16% 27% 11% 1	2273
May	1st to 10th	Day	38% 6% 16% 26% 12% 1	2373
	11th to 20th	Day	42% 8% 19% 23% 8% 1	2482
	21st to end	Day	39% 8% 19% 24% 9% 2	2724
June	1st to 10th	Day	28% 8% 19% 29% 13% 2	2520
	11th to 20th	Day	28% 7% 17% 27% 16% 6%	2520
	21st to end	Day	19% 6% 14% 30% 24% 7%	2520
July	1st to 10th	Day	23% 8% 14% 28% 22% 5%	2451
	11th to 20th	Day	16% 6% 11% 26% 26% 15%	2445
	21st to end	Day	20% 6% 13% 27% 23% 11%	2590
August	1st to 10th	Day	24% 7% 16% 28% 18% 7%	2491
	11th to 20th	Day	20% 6% 13% 31% 20% 10%	2179
	21st to end	Day	20% 5% 9% 24% 27% 14%	2376
September	1st to 10th	Day	22% 4 9% 25% 26% 14%	2160
	11th to 20th	Day	21% 5% 10% 27% 26% 10%	2084
	21st to end	Day	25% 3 9% 34% 25% 4	1980
October	1st to 10th	Day	32% 5% 11% 25% 24% 3	1890
	11th to 20th	Day	26% 5% 12% 29% 21% 6%	1781
	21st to end	Day	28% 5% 18% 27% 17% 5%	1782
November	1st to 10th	Day	27% 6% 15% 27% 20% 5%	1673
	11th to 20th	Day	26% 5% 15% 31% 18% 5%	1710
	21st to end	Day	28% 6% 15% 30% 17% 4	1549
December	1st to 10th	Day	29% 7% 18% 26% 18% 2	1520
	11th to 20th	Day	26% 6% 19% 35% 13% 1	1924
	21st to end	Day	38% 5% 10% 29% 16% 2	2794
January	1st to 10th	Night	33% 7% 18% 26% 14% 2	2647
	11th to 20th	Night	30% 8% 19% 26% 14% 2	2569
	21st to end	Night	36% 7% 18% 24% 13% 2	2772
February	1st to 10th	Night	40% 7% 17% 24% 12% 1	2340
	11th to 20th	Night	36% 8% 16% 26% 12% 3	2120
	21st to end	Night	37% 5% 14% 25% 15% 4	1776
March	1st to 10th	Night	33% 5% 16% 28% 16% 2	2160
	11th to 20th	Night	32% 7% 15% 25% 18% 2	2112
	21st to end	Night	39% 7% 18% 23% 12% 1	1980
April	1st to 10th	Night	37% 8% 15% 23% 14% 3	1800
	11th to 20th	Night	41% 6% 13% 24% 13% 3	1777
	21st to end	Night	39% 8% 14% 24% 14% 2	1685
May	1st to 10th	Night	37% 6% 15% 28% 13% 1	1584
	11th to 20th	Night	39% 8% 18% 26% 8% 1	1418
	21st to end	Night	38% 8% 17% 24% 12% 2	1552
June	1st to 10th	Night	29% 8% 24% 25% 12% 2	1440
	11th to 20th	Night	31% 9% 19% 24% 13% 4	1440
	21st to end	Night	22% 7% 17% 28% 21% 5%	1440
July	1st to 10th	Night	27% 6% 15% 29% 19% 3	1400
	11th to 20th	Night	18% 6% 12% 28% 22% 13%	1392
	21st to end	Night	21% 6% 15% 30% 20% 8%	1488
August	1st to 10th	Night	28% 8% 14% 28% 17% 5%	1424
	11th to 20th	Night	21% 5% 12% 29% 27% 7%	1718
	21st to end	Night	22% 6% 10% 24% 28% 10%	1980
September	1st to 10th	Night	25% 3 9% 26% 27% 10%	1800
	11th to 20th	Night	23% 5% 12% 26% 26% 8%	1876
	21st to end	Night	27% 4 6% 29% 25% 8%	1980
October	1st to 10th	Night	34% 6% 12% 22% 22% 5%	2065
	11th to 20th	Night	30% 5% 10% 27% 22% 7%	2160
	21st to end	Night	30% 6% 14% 24% 20% 6%	2574
November	1st to 10th	Night	30% 5% 15% 25% 19% 6%	2405
	11th to 20th	Night	28% 5% 13% 30% 19% 5%	2470
	21st to end	Night	28% 6% 14% 28% 21% 3	2630
December	1st to 10th	Night	30% 7% 16% 28% 17% 3	2660
	11th to 20th	Night	28% 7% 17% 34% 12% 1	3272
	21st to end	Night	37% 5% 12% 31% 12% 3	4873

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	4 11% 40% 29% 13% 3	270
	11th to 20th	Day	11% 17% 39% 26% 7%	249
	21st to end	Day	10% 27% 42% 16% 3 1	264
February	1st to 10th	Day	14% 18% 52% 15% 1	240
	11th to 20th	Day	8% 22% 46% 18% 5%	240
	21st to end	Day	7% 22% 41% 26% 3 1	198
March	1st to 10th	Day	6% 25% 37% 25% 7% 1	240
	11th to 20th	Day	15% 13% 33% 29% 9% 1	276
	21st to end	Day	19% 18% 31% 24% 7% 1	462
April	1st to 10th	Day	17% 21% 39% 18% 4	420
	11th to 20th	Day	20% 24% 37% 17% 3	412
	21st to end	Day	17% 14% 29% 28% 11% 1	533
May	1st to 10th	Day	16% 14% 31% 23% 13% 3	603
	11th to 20th	Day	19% 10% 24% 27% 16% 4	625
	21st to end	Day	18% 12% 25% 28% 15% 2	679
June	1st to 10th	Day	9% 7% 24% 32% 23% 5%	630
	11th to 20th	Day	11% 10% 34% 32% 13% 1	630
	21st to end	Day	8% 5% 27% 37% 21% 3	630
July	1st to 10th	Day	6% 3 21% 39% 26% 4	621
	11th to 20th	Day	4 4 29% 42% 19% 2	618
	21st to end	Day	6% 4 21% 40% 27% 2	684
August	1st to 10th	Day	6% 3 22% 45% 21% 3	626
	11th to 20th	Day	5% 5% 25% 35% 26% 5%	476
	21st to end	Day	5% 7% 25% 36% 23% 4	495
September	1st to 10th	Day	6% 6% 29% 36% 18% 4	450
	11th to 20th	Day	8% 6% 26% 32% 22% 5%	374
	21st to end	Day	14% 12% 25% 30% 15% 3	270
October	1st to 10th	Day	16% 11% 24% 26% 17% 6%	270
	11th to 20th	Day	17% 15% 34% 22% 10% 3	270
	21st to end	Day	10% 18% 33% 27% 11% 1	297
November	1st to 10th	Day	10% 17% 38% 24% 9% 3	270
	11th to 20th	Day	10% 14% 41% 29% 7%	270
	21st to end	Day	10% 14% 44% 25% 7%	270
December	1st to 10th	Day	9% 19% 39% 27% 7%	270
	11th to 20th	Day	8% 17% 52% 20% 3	270
	21st to end	Day	11% 18% 43% 22% 4 1	297
January	1st to 10th	Night	5% 13% 40% 30% 11%	950
	11th to 20th	Night	5% 16% 44% 26% 8% 1	918
	21st to end	Night	8% 14% 47% 27% 4	990
February	1st to 10th	Night	9% 11% 46% 28% 5% 1	720
	11th to 20th	Night	9% 11% 40% 34% 6% 1	704
	21st to end	Night	10% 10% 42% 31% 6% 1	592
March	1st to 10th	Night	9% 10% 37% 37% 6%	720
	11th to 20th	Night	9% 7% 34% 41% 9% 1	712
	21st to end	Night	17% 9% 30% 34% 9% 1	594
April	1st to 10th	Night	18% 9% 33% 36% 4	540
	11th to 20th	Night	18% 12% 32% 33% 5%	533
	21st to end	Night	17% 11% 25% 34% 12% 1	540
May	1st to 10th	Night	14% 9% 27% 35% 13% 1	540
	11th to 20th	Night	16% 7% 24% 36% 17% 1	531
	21st to end	Night	17% 7% 31% 34% 11%	584
June	1st to 10th	Night	8% 4 27% 45% 15% 1	540
	11th to 20th	Night	13% 6% 33% 39% 9% 1	540
	21st to end	Night	5% 4 26% 52% 13%	540
July	1st to 10th	Night	5% 3 21% 45% 25% 1	525
	11th to 20th	Night	4 4 28% 49% 15%	522
	21st to end	Night	4 1 21% 55% 18%	591
August	1st to 10th	Night	4 3 25% 51% 17% 1	537
	11th to 20th	Night	5% 3 18% 52% 21% 1	534
	21st to end	Night	4 4 22% 47% 23% 1	594
September	1st to 10th	Night	9% 3 21% 47% 19% 1	540
	11th to 20th	Night	8% 6% 24% 41% 21% 1	540
	21st to end	Night	12% 7% 24% 39% 17%	540
October	1st to 10th	Night	15% 6% 27% 35% 17% 1	625
	11th to 20th	Night	12% 9% 28% 38% 12%	720
	21st to end	Night	12% 8% 35% 34% 9% 2	990
November	1st to 10th	Night	10% 7% 36% 36% 9% 2	925
	11th to 20th	Night	9% 10% 38% 36% 7%	950
	21st to end	Night	6% 11% 37% 39% 7%	950
December	1st to 10th	Night	7% 12% 47% 28% 6%	950
	11th to 20th	Night	6% 9% 44% 34% 6%	950
	21st to end	Night	11% 13% 40% 28% 7%	1045

Page generated at 2024-01-11 02:22:41. Version ac07

Copyright 2024 Attilla Danko