Hendrix Habitat
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hendrix Habitat clear sky chart from 2005-11-06 to 2026-06-16.

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	13% 7% 3 7% 4 4 5% 4 6% 7% 40%	137483
	Night	13% 8% 3 7% 4 4 4 3 5% 7% 42%	134644
Transparency	Day	41% 5% 11% 23% 17% 3	141173
	Night	41% 4 10% 22% 18% 4	139028
Seeing	Day	17% 11% 25% 23% 16% 7%	17321
	Night	17% 9% 25% 28% 17% 3	27059

By Month

Percentage Cloud Cover SE (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	15% 12% 5% 11% 4 4 4 2 4 6% 33%	4691
	11th to 20th	Day	13% 7% 3 10% 3 2 2 2 3 4 50%	4779
	21st to end	Day	20% 8% 4 6% 5% 3 3 3 4 6% 37%	6436
February	1st to 10th	Day	17% 11% 4 8% 4 4 3 3 4 6% 36%	2100
	11th to 20th	Day	20% 10% 5% 7% 5% 4 3 3 4 5% 34%	2048
	21st to end	Day	18% 9% 4 6% 4 4 4 3 4 6% 37%	1730
March	1st to 10th	Day	16% 13% 4 8% 4 4 4 3 4 5% 36%	4580
	11th to 20th	Day	13% 7% 3 6% 4 4 4 3 4 6% 47%	4808
	21st to end	Day	11% 8% 3 6% 5% 4 5% 4 5% 6% 43%	5994
April	1st to 10th	Day	12% 6% 2 6% 4 5% 4 4 5% 7% 45%	2520
	11th to 20th	Day	13% 7% 3 6% 4 4 5% 3 5% 5% 43%	2494
	21st to end	Day	13% 6% 3 7% 5% 5% 4 4 6% 7% 40%	2529
May	1st to 10th	Day	17% 8% 3 7% 5% 4 5% 5% 7% 9% 32%	7616
	11th to 20th	Day	13% 8% 3 9% 5% 5% 4 4 6% 7% 36%	7626
	21st to end	Day	19% 10% 3 8% 5% 5% 5% 4 5% 7% 29%	8391
June	1st to 10th	Day	9% 6% 2 6% 5% 5% 6% 5% 6% 10% 40%	2782
	11th to 20th	Day	5% 4 2 7% 5% 5% 6% 5% 8% 10% 44%	2871
	21st to end	Day	5% 4 2 5% 5% 6% 7% 5% 9% 11% 42%	2800
July	1st to 10th	Day	6% 4 2 6% 5% 6% 6% 5% 8% 11% 40%	6360
	11th to 20th	Day	7% 5% 3 7% 5% 6% 7% 6% 9% 11% 35%	6319
	21st to end	Day	11% 8% 3 8% 5% 5% 6% 5% 7% 11% 30%	6424
August	1st to 10th	Day	4 3 1 4 4 4 4 4 8% 10% 53%	3949
	11th to 20th	Day	6% 5% 2 7% 5% 5% 6% 5% 7% 10% 41%	3849
	21st to end	Day	5% 4 1 5% 4 4 4 4 6% 9% 53%	4312
September	1st to 10th	Day	10% 6% 2 6% 4 5% 6% 5% 7% 9% 40%	2390
	11th to 20th	Day	14% 5% 2 6% 4 4 5% 4 5% 7% 44%	2200
	21st to end	Day	11% 5% 1 6% 4 4 4 4 5% 7% 48%	2200
October	1st to 10th	Day	11% 4 1 4 4 4 4 3 4 6% 56%	2200
	11th to 20th	Day	11% 5% 2 6% 3 3 4 3 4 6% 54%	2126
	21st to end	Day	17% 7% 2 6% 4 3 4 3 3 5% 47%	2022
November	1st to 10th	Day	12% 7% 2 4 2 3 3 3 4 6% 54%	1852
	11th to 20th	Day	14% 7% 2 4 4 2 3 3 5% 7% 48%	1890
	21st to end	Day	14% 8% 2 5% 4 4 4 3 5% 6% 45%	1890
December	1st to 10th	Day	15% 9% 2 6% 3 3 4 3 5% 4 45%	3020
	11th to 20th	Day	19% 11% 4 8% 4 4 4 3 4 5% 34%	3463
	21st to end	Day	16% 11% 3 9% 5% 5% 5% 4 6% 6% 30%	4222
January	1st to 10th	Night	16% 11% 3 8% 4 3 4 3 4 5% 39%	8232
	11th to 20th	Night	14% 9% 3 8% 4 3 3 2 3 4 45%	8184
	21st to end	Night	19% 12% 4 7% 5% 3 3 2 3 4 37%	7745
February	1st to 10th	Night	18% 11% 4 9% 5% 4 3 3 4 6% 33%	2520
	11th to 20th	Night	21% 11% 3 8% 4 3 3 2 4 4 35%	2458
	21st to end	Night	21% 10% 4 6% 4 4 4 2 5% 5% 36%	2076
March	1st to 10th	Night	18% 12% 3 7% 4 4 4 3 5% 7% 35%	5493
	11th to 20th	Night	11% 7% 2 6% 4 4 4 4 5% 5% 49%	5358
	21st to end	Night	13% 8% 3 7% 5% 4 4 4 5% 7% 41%	5220
April	1st to 10th	Night	12% 6% 2 7% 4 3 4 3 5% 8% 46%	2100
	11th to 20th	Night	14% 6% 2 4 4 3 4 4 4 7% 48%	2075
	21st to end	Night	12% 7% 3 6% 4 4 4 3 6% 8% 43%	2090
May	1st to 10th	Night	14% 9% 3 8% 6% 4 5% 3 5% 6% 36%	5237
	11th to 20th	Night	11% 9% 3 9% 5% 4 4 4 5% 7% 38%	5234
	21st to end	Night	17% 9% 3 9% 5% 5% 5% 4 6% 8% 29%	5761
June	1st to 10th	Night	8% 7% 2 6% 3 4 4 4 7% 10% 45%	1831
	11th to 20th	Night	4 4 1 5% 3 4 5% 4 8% 11% 53%	1640
	21st to end	Night	3 4 1 4 4 4 5% 7% 8% 12% 49%	1600
July	1st to 10th	Night	7% 4 2 6% 5% 5% 6% 5% 9% 12% 41%	3618
	11th to 20th	Night	4 4 2 5% 4 4 6% 5% 8% 15% 41%	3651
	21st to end	Night	7% 7% 3 8% 6% 6% 6% 5% 8% 13% 31%	4427
August	1st to 10th	Night	3 3 2 4 3 3 4 3 6% 9% 61%	3195
	11th to 20th	Night	4 4 1 4 4 4 5% 5% 8% 12% 49%	3200
	21st to end	Night	5% 3 1 4 3 3 4 3 6% 8% 57%	3586
September	1st to 10th	Night	10% 6% 2 5% 3 4 5% 3 6% 6% 50%	2000
	11th to 20th	Night	11% 5% 2 5% 4 4 5% 3 5% 7% 50%	2190
	21st to end	Night	10% 5% 2 5% 4 3 4 3 5% 6% 54%	2200
October	1st to 10th	Night	9% 5% 1 3 3 3 3 2 4 5% 62%	2200
	11th to 20th	Night	14% 6% 1 5% 3 3 3 2 4 5% 53%	2270
	21st to end	Night	15% 7% 2 4 3 4 3 3 5% 5% 49%	2815
November	1st to 10th	Night	12% 6% 2 5% 4 3 3 3 4 5% 52%	2666
	11th to 20th	Night	12% 7% 2 5% 3 3 3 3 5% 7% 49%	2730
	21st to end	Night	16% 8% 3 6% 4 3 3 3 4 6% 45%	2730
December	1st to 10th	Night	17% 10% 3 8% 4 3 3 3 4 4 41%	4380
	11th to 20th	Night	20% 10% 3 6% 3 3 3 2 4 4 41%	4952
	21st to end	Night	17% 12% 6% 9% 5% 6% 5% 3 4 5% 28%	6980

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	53% 3 9% 23% 10% 1	4692
	11th to 20th	Day	40% 3 4 22% 30% 1	4779
	21st to end	Day	49% 3 7% 22% 14% 5%	6436
February	1st to 10th	Day	51% 3 7% 21% 15% 2	2100
	11th to 20th	Day	53% 4 7% 20% 14% 3	2058
	21st to end	Day	49% 3 8% 18% 17% 6%	1730
March	1st to 10th	Day	52% 3 5% 14% 17% 9%	4580
	11th to 20th	Day	40% 4 8% 21% 20% 8%	4808
	21st to end	Day	41% 4 10% 27% 17% 1	5996
April	1st to 10th	Day	38% 5% 11% 24% 20% 3	2520
	11th to 20th	Day	40% 5% 8% 22% 20% 5%	2494
	21st to end	Day	42% 5% 11% 24% 16% 2	2529
May	1st to 10th	Day	47% 6% 13% 21% 11% 1	7651
	11th to 20th	Day	46% 6% 12% 21% 14% 1	7630
	21st to end	Day	54% 6% 8% 18% 12% 2	8405
June	1st to 10th	Day	37% 7% 12% 24% 17% 2	2782
	11th to 20th	Day	32% 7% 16% 24% 18% 3	2871
	21st to end	Day	31% 9% 16% 23% 16% 4	2800
July	1st to 10th	Day	35% 9% 17% 27% 11% 1	6291
	11th to 20th	Day	37% 9% 20% 27% 6% 1	6244
	21st to end	Day	45% 8% 20% 21% 5% 1	6240
August	1st to 10th	Day	24% 6% 15% 34% 20% 1	3936
	11th to 20th	Day	35% 6% 13% 27% 16% 2	3885
	21st to end	Day	27% 5% 11% 30% 24% 2	4311
September	1st to 10th	Day	37% 8% 11% 23% 17% 4	2390
	11th to 20th	Day	38% 6% 9% 24% 21% 2	2200
	21st to end	Day	35% 5% 10% 23% 22% 5%	2200
October	1st to 10th	Day	21% 3 5% 17% 44% 9%	3590
	11th to 20th	Day	23% 3 6% 24% 29% 15%	3444
	21st to end	Day	32% 3 5% 23% 30% 7%	3247
November	1st to 10th	Day	33% 3 8% 24% 27% 5%	1852
	11th to 20th	Day	37% 3 8% 23% 23% 6%	1890
	21st to end	Day	41% 3 6% 25% 20% 5%	1890
December	1st to 10th	Day	43% 3 5% 28% 20% 2	3020
	11th to 20th	Day	53% 4 7% 20% 14% 3	3460
	21st to end	Day	51% 5% 10% 24% 8% 1	4222
January	1st to 10th	Night	48% 3 13% 22% 13% 1	8233
	11th to 20th	Night	44% 2 4 20% 25% 4	8184
	21st to end	Night	53% 2 6% 18% 15% 5%	7745
February	1st to 10th	Night	53% 3 9% 18% 15% 1	2520
	11th to 20th	Night	53% 3 6% 19% 16% 4	2459
	21st to end	Night	51% 3 7% 17% 17% 5%	2076
March	1st to 10th	Night	50% 4 6% 15% 18% 7%	5493
	11th to 20th	Night	36% 4 8% 20% 19% 14%	5358
	21st to end	Night	43% 4 8% 26% 16% 2	5220
April	1st to 10th	Night	37% 4 12% 24% 20% 3	2100
	11th to 20th	Night	37% 4 9% 22% 21% 7%	2075
	21st to end	Night	38% 5% 11% 26% 18% 2	2090
May	1st to 10th	Night	48% 5% 12% 21% 13% 1	5264
	11th to 20th	Night	45% 6% 14% 17% 16% 2	5235
	21st to end	Night	52% 7% 12% 18% 10% 1	5771
June	1st to 10th	Night	33% 6% 15% 24% 19% 3	1831
	11th to 20th	Night	24% 6% 17% 32% 18% 3	1640
	21st to end	Night	24% 9% 18% 30% 15% 4	1600
July	1st to 10th	Night	32% 8% 19% 28% 12% 2	3580
	11th to 20th	Night	29% 9% 25% 30% 6% 2	3606
	21st to end	Night	42% 9% 22% 21% 6% 1	4297
August	1st to 10th	Night	21% 5% 12% 39% 23% 1	3184
	11th to 20th	Night	25% 7% 22% 29% 16% 1	3230
	21st to end	Night	23% 5% 12% 32% 24% 3	3586
September	1st to 10th	Night	33% 6% 11% 25% 19% 5%	2000
	11th to 20th	Night	33% 5% 10% 23% 26% 3	2190
	21st to end	Night	31% 6% 9% 24% 25% 6%	2200
October	1st to 10th	Night	19% 3 6% 18% 42% 12%	3590
	11th to 20th	Night	21% 2 4 23% 31% 18%	3691
	21st to end	Night	27% 3 6% 25% 29% 11%	4540
November	1st to 10th	Night	35% 4 7% 23% 25% 7%	2666
	11th to 20th	Night	34% 3 7% 22% 26% 7%	2730
	21st to end	Night	42% 3 7% 23% 20% 5%	2730
December	1st to 10th	Night	47% 3 7% 17% 24% 2	4380
	11th to 20th	Night	48% 3 5% 23% 20% 3	4954
	21st to end	Night	57% 5% 7% 21% 8% 2	6980

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% 21% 36% 13% 5%	330
	11th to 20th	Day	31% 26% 28% 12% 2 1	330
	21st to end	Day	24% 26% 39% 9% 2	363
February	1st to 10th	Day	30% 23% 33% 12% 1 1	330
	11th to 20th	Day	38% 24% 28% 8% 2	330
	21st to end	Day	33% 26% 29% 9% 2	273
March	1st to 10th	Day	30% 20% 35% 12% 3	330
	11th to 20th	Day	26% 23% 34% 13% 4	414
	21st to end	Day	25% 17% 37% 17% 4	594
April	1st to 10th	Day	23% 17% 31% 21% 7% 1	540
	11th to 20th	Day	23% 16% 29% 22% 8% 2	532
	21st to end	Day	18% 19% 29% 22% 10% 2	540
May	1st to 10th	Day	22% 15% 31% 20% 10% 3	543
	11th to 20th	Day	14% 11% 30% 22% 17% 5%	567
	21st to end	Day	16% 7% 22% 27% 18% 10%	617
June	1st to 10th	Day	12% 5% 25% 26% 19% 14%	622
	11th to 20th	Day	6% 5% 19% 30% 28% 12%	756
	21st to end	Day	6% 3 21% 33% 23% 15%	730
July	1st to 10th	Day	8% 2 12% 33% 30% 15%	721
	11th to 20th	Day	8% 3 14% 28% 30% 17%	703
	21st to end	Day	8% 4 12% 29% 29% 18%	576
August	1st to 10th	Day	8% 2 15% 29% 31% 16%	526
	11th to 20th	Day	10% 4 14% 33% 30% 9%	519
	21st to end	Day	11% 3 11% 25% 32% 18%	583
September	1st to 10th	Day	9% 4 15% 31% 29% 13%	530
	11th to 20th	Day	13% 3 11% 26% 33% 15%	530
	21st to end	Day	17% 5% 18% 29% 23% 8%	530
October	1st to 10th	Day	12% 4 25% 28% 23% 8%	530
	11th to 20th	Day	13% 12% 33% 26% 13% 3	456
	21st to end	Day	26% 13% 31% 21% 7% 1	363
November	1st to 10th	Day	20% 14% 31% 24% 9% 1	330
	11th to 20th	Day	18% 18% 39% 21% 4 1	330
	21st to end	Day	22% 19% 30% 18% 9% 2	330
December	1st to 10th	Day	30% 18% 32% 17% 3 1	330
	11th to 20th	Day	25% 20% 34% 15% 5% 1	330
	21st to end	Day	27% 21% 34% 17% 1	363
January	1st to 10th	Night	24% 16% 31% 24% 4	1050
	11th to 20th	Night	26% 20% 30% 20% 4	1024
	21st to end	Night	23% 13% 40% 22% 2	924
February	1st to 10th	Night	24% 14% 35% 23% 3	840
	11th to 20th	Night	30% 16% 32% 19% 2	823
	21st to end	Night	30% 17% 33% 18% 2	692
March	1st to 10th	Night	23% 17% 32% 24% 5%	840
	11th to 20th	Night	22% 13% 37% 22% 5%	840
	21st to end	Night	19% 14% 35% 25% 7%	763
April	1st to 10th	Night	16% 13% 33% 29% 7%	630
	11th to 20th	Night	19% 12% 33% 26% 9% 1	623
	21st to end	Night	16% 11% 31% 29% 12% 1	630
May	1st to 10th	Night	14% 8% 34% 27% 15% 2	630
	11th to 20th	Night	12% 6% 27% 33% 18% 4	621
	21st to end	Night	11% 3 20% 36% 24% 5%	683
June	1st to 10th	Night	11% 2 18% 36% 29% 4	630
	11th to 20th	Night	5% 2 14% 37% 36% 6%	615
	21st to end	Night	4 2 15% 37% 36% 8%	600
July	1st to 10th	Night	8% 3 9% 32% 36% 13%	585
	11th to 20th	Night	8% 2 10% 30% 41% 9%	582
	21st to end	Night	6% 2 8% 32% 43% 9%	657
August	1st to 10th	Night	7% 1 7% 33% 43% 9%	597
	11th to 20th	Night	6% 3 10% 39% 37% 6%	594
	21st to end	Night	8% 2 8% 33% 40% 9%	660
September	1st to 10th	Night	11% 3 12% 32% 38% 5%	600
	11th to 20th	Night	14% 3 10% 28% 39% 7%	790
	21st to end	Night	12% 4 18% 31% 32% 5%	800
October	1st to 10th	Night	10% 5% 18% 33% 28% 6%	800
	11th to 20th	Night	18% 7% 23% 32% 19% 1	800
	21st to end	Night	19% 8% 28% 30% 14% 1	880
November	1st to 10th	Night	16% 9% 23% 35% 15% 2	820
	11th to 20th	Night	15% 12% 34% 28% 11%	840
	21st to end	Night	22% 12% 28% 28% 10%	840
December	1st to 10th	Night	26% 13% 29% 25% 7%	840
	11th to 20th	Night	22% 11% 35% 25% 7% 1	840
	21st to end	Night	27% 16% 30% 23% 4	1076

Page generated at 2026-06-13 01:31:43. Version ac07

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