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 2025-02-21.

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% 41%	108914
	Night	13% 8% 3 6% 4 4 4 3 5% 7% 43%	109729
Transparency	Day	40% 5% 10% 24% 18% 3	112646
	Night	40% 4 9% 23% 19% 4	114136
Seeing	Day	17% 11% 24% 23% 17% 8%	15526
	Night	17% 9% 25% 28% 18% 3	25369

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	14% 12% 6% 12% 4 4 4 2 4 6% 33%	3617
	11th to 20th	Day	15% 8% 3 12% 4 2 3 2 3 4 44%	3676
	21st to end	Day	19% 9% 4 5% 3 3 3 3 5% 7% 40%	4972
February	1st to 10th	Day	18% 11% 4 8% 4 4 3 3 4 6% 36%	2000
	11th to 20th	Day	20% 10% 5% 7% 5% 4 3 3 4 5% 34%	1948
	21st to end	Day	20% 10% 4 6% 5% 3 4 3 4 6% 35%	1570
March	1st to 10th	Day	20% 13% 4 8% 4 4 4 3 4 5% 31%	3120
	11th to 20th	Day	13% 6% 3 6% 3 4 4 3 5% 6% 47%	3288
	21st to end	Day	12% 8% 3 6% 6% 4 5% 4 5% 6% 41%	4091
April	1st to 10th	Day	12% 6% 2 6% 4 4 4 4 5% 7% 45%	2280
	11th to 20th	Day	14% 7% 3 6% 4 4 5% 3 5% 5% 43%	2254
	21st to end	Day	14% 6% 2 7% 5% 5% 4 4 6% 7% 40%	2288
May	1st to 10th	Day	16% 7% 3 6% 5% 4 5% 5% 6% 8% 35%	4082
	11th to 20th	Day	15% 9% 3 7% 4 4 4 3 5% 7% 37%	4081
	21st to end	Day	11% 7% 3 7% 5% 5% 5% 4 6% 8% 39%	4476
June	1st to 10th	Day	9% 6% 2 6% 5% 5% 6% 5% 6% 10% 40%	2517
	11th to 20th	Day	5% 4 2 6% 4 5% 6% 5% 8% 10% 45%	2660
	21st to end	Day	5% 4 2 5% 5% 6% 6% 5% 9% 11% 42%	2660
July	1st to 10th	Day	6% 5% 2 6% 6% 6% 7% 5% 8% 11% 38%	4440
	11th to 20th	Day	8% 5% 3 7% 5% 6% 6% 5% 8% 10% 38%	4413
	21st to end	Day	15% 10% 4 10% 5% 6% 6% 5% 6% 8% 26%	4466
August	1st to 10th	Day	4 3 1 4 4 4 4 4 8% 10% 53%	3828
	11th to 20th	Day	6% 5% 2 7% 5% 5% 6% 5% 7% 10% 41%	3729
	21st to end	Day	5% 4 1 5% 4 4 4 4 6% 9% 53%	4180
September	1st to 10th	Day	10% 6% 2 6% 4 5% 6% 4 7% 9% 40%	2271
	11th to 20th	Day	14% 5% 2 6% 4 4 5% 4 5% 7% 43%	2090
	21st to end	Day	12% 5% 1 6% 4 4 4 4 5% 7% 48%	2090
October	1st to 10th	Day	11% 4 1 4 4 4 4 3 4 6% 56%	2090
	11th to 20th	Day	12% 5% 2 6% 3 3 4 3 4 6% 53%	2020
	21st to end	Day	17% 7% 2 6% 4 3 3 3 3 5% 48%	1921
November	1st to 10th	Day	13% 7% 2 4 2 3 3 2 4 6% 54%	1762
	11th to 20th	Day	14% 8% 3 5% 4 2 3 3 5% 7% 48%	1800
	21st to end	Day	14% 9% 2 5% 3 3 4 3 5% 6% 45%	1800
December	1st to 10th	Day	15% 9% 2 6% 3 3 4 3 5% 4 45%	2930
	11th to 20th	Day	19% 11% 4 9% 4 4 4 3 4 5% 33%	3373
	21st to end	Day	16% 11% 3 9% 5% 5% 5% 4 6% 6% 30%	4131
January	1st to 10th	Night	15% 13% 4 10% 4 3 4 2 4 6% 36%	6348
	11th to 20th	Night	16% 10% 3 9% 4 3 3 2 3 4 42%	6278
	21st to end	Night	19% 11% 4 6% 4 3 3 3 3 5% 39%	5984
February	1st to 10th	Night	19% 11% 4 8% 5% 4 3 3 4 5% 33%	2400
	11th to 20th	Night	21% 11% 3 8% 4 3 3 2 4 4 35%	2338
	21st to end	Night	22% 10% 4 7% 4 4 4 3 5% 5% 33%	1885
March	1st to 10th	Night	22% 12% 3 6% 4 4 3 3 4 6% 33%	3733
	11th to 20th	Night	13% 8% 2 5% 4 4 4 4 4 5% 47%	3658
	21st to end	Night	15% 8% 3 7% 5% 4 3 4 5% 6% 39%	3569
April	1st to 10th	Night	11% 6% 2 7% 4 3 4 3 5% 7% 47%	1900
	11th to 20th	Night	15% 7% 2 4 4 3 4 4 4 6% 47%	1875
	21st to end	Night	12% 8% 2 5% 4 4 4 3 6% 8% 43%	1891
May	1st to 10th	Night	13% 8% 3 7% 6% 4 4 3 5% 6% 40%	2813
	11th to 20th	Night	11% 9% 2 7% 4 4 4 3 5% 7% 43%	2812
	21st to end	Night	7% 6% 2 6% 5% 5% 5% 5% 7% 10% 42%	3079
June	1st to 10th	Night	8% 7% 2 6% 4 5% 4 4 7% 9% 45%	1657
	11th to 20th	Night	3 3 1 4 3 4 4 4 7% 11% 55%	1520
	21st to end	Night	3 4 1 4 4 4 5% 7% 8% 12% 49%	1520
July	1st to 10th	Night	6% 4 2 6% 5% 5% 6% 5% 9% 13% 39%	2530
	11th to 20th	Night	5% 5% 2 5% 3 4 5% 4 7% 12% 47%	2551
	21st to end	Night	10% 9% 4 10% 6% 6% 6% 4 7% 10% 29%	3087
August	1st to 10th	Night	3 3 2 4 3 3 4 3 6% 9% 61%	3097
	11th to 20th	Night	4 4 1 4 4 4 5% 5% 8% 12% 49%	3100
	21st to end	Night	5% 3 1 4 3 3 4 3 6% 8% 57%	3476
September	1st to 10th	Night	10% 6% 2 5% 3 4 5% 4 6% 6% 49%	1900
	11th to 20th	Night	11% 5% 2 5% 4 4 5% 3 5% 7% 50%	2080
	21st to end	Night	10% 5% 2 5% 4 3 4 3 5% 6% 54%	2090
October	1st to 10th	Night	9% 4 1 3 3 3 3 2 4 5% 62%	2090
	11th to 20th	Night	14% 6% 1 5% 3 3 3 2 4 5% 52%	2156
	21st to end	Night	15% 7% 2 4 3 4 3 3 5% 6% 49%	2674
November	1st to 10th	Night	12% 6% 2 4 4 3 3 3 4 5% 52%	2536
	11th to 20th	Night	12% 7% 2 5% 3 3 3 3 5% 7% 49%	2600
	21st to end	Night	15% 8% 3 6% 3 3 3 3 4 6% 46%	2600
December	1st to 10th	Night	16% 10% 3 8% 4 3 3 3 4 4 42%	4250
	11th to 20th	Night	21% 10% 3 6% 3 3 2 2 4 4 41%	4822
	21st to end	Night	17% 12% 6% 9% 5% 6% 5% 3 4 5% 28%	6830

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	54% 4 8% 19% 13% 2	3618
	11th to 20th	Day	45% 3 5% 22% 25% 1	3676
	21st to end	Day	45% 3 7% 23% 17% 6%	4972
February	1st to 10th	Day	51% 3 8% 21% 15% 2	2000
	11th to 20th	Day	53% 4 6% 20% 13% 4	1958
	21st to end	Day	51% 3 8% 17% 16% 6%	1570
March	1st to 10th	Day	56% 4 6% 13% 13% 8%	3120
	11th to 20th	Day	38% 5% 10% 24% 18% 6%	3288
	21st to end	Day	42% 4 10% 26% 16% 1	4091
April	1st to 10th	Day	38% 5% 10% 23% 21% 3	2280
	11th to 20th	Day	41% 5% 7% 21% 21% 5%	2254
	21st to end	Day	42% 5% 10% 25% 16% 2	2288
May	1st to 10th	Day	45% 7% 11% 23% 12% 1	4120
	11th to 20th	Day	45% 6% 12% 24% 13%	4085
	21st to end	Day	40% 7% 10% 22% 19% 1	4489
June	1st to 10th	Day	38% 7% 12% 24% 17% 3	2517
	11th to 20th	Day	30% 7% 16% 25% 19% 3	2660
	21st to end	Day	32% 8% 16% 23% 16% 4	2660
July	1st to 10th	Day	36% 9% 19% 27% 8% 2	4371
	11th to 20th	Day	37% 7% 16% 29% 9% 2	4338
	21st to end	Day	55% 7% 13% 18% 7% 1	4324
August	1st to 10th	Day	23% 6% 15% 33% 21% 1	3815
	11th to 20th	Day	35% 6% 14% 27% 16% 2	3765
	21st to end	Day	27% 6% 11% 30% 24% 2	4179
September	1st to 10th	Day	38% 8% 11% 22% 17% 4	2271
	11th to 20th	Day	39% 6% 9% 23% 21% 2	2090
	21st to end	Day	34% 5% 10% 24% 21% 5%	2090
October	1st to 10th	Day	21% 3 5% 17% 44% 10%	3480
	11th to 20th	Day	24% 3 6% 24% 29% 14%	3338
	21st to end	Day	31% 3 5% 24% 31% 7%	3146
November	1st to 10th	Day	33% 3 8% 23% 27% 6%	1762
	11th to 20th	Day	37% 3 8% 22% 24% 7%	1800
	21st to end	Day	41% 3 6% 25% 20% 5%	1800
December	1st to 10th	Day	42% 3 5% 28% 20% 2	2930
	11th to 20th	Day	53% 4 6% 20% 13% 3	3370
	21st to end	Day	51% 5% 10% 24% 8% 1	4131
January	1st to 10th	Night	51% 3 8% 21% 16% 1	6348
	11th to 20th	Night	48% 3 5% 19% 21% 4	6278
	21st to end	Night	50% 3 5% 21% 17% 5%	5984
February	1st to 10th	Night	54% 3 9% 18% 16% 1	2400
	11th to 20th	Night	53% 3 6% 18% 16% 4	2339
	21st to end	Night	53% 3 8% 15% 16% 5%	1885
March	1st to 10th	Night	52% 5% 7% 12% 16% 7%	3733
	11th to 20th	Night	38% 5% 9% 22% 16% 10%	3658
	21st to end	Night	45% 4 8% 24% 18% 1	3569
April	1st to 10th	Night	37% 4 11% 25% 21% 3	1900
	11th to 20th	Night	38% 4 8% 21% 22% 8%	1875
	21st to end	Night	38% 5% 11% 26% 18% 2	1891
May	1st to 10th	Night	44% 5% 14% 22% 14% 2	2840
	11th to 20th	Night	39% 6% 17% 21% 16% 1	2813
	21st to end	Night	34% 8% 16% 24% 17% 1	3087
June	1st to 10th	Night	34% 7% 15% 24% 18% 3	1657
	11th to 20th	Night	22% 6% 17% 33% 19% 3	1520
	21st to end	Night	24% 9% 18% 29% 16% 4	1520
July	1st to 10th	Night	32% 9% 20% 29% 9% 2	2490
	11th to 20th	Night	28% 7% 17% 38% 8% 3	2503
	21st to end	Night	51% 7% 13% 19% 9% 1	2988
August	1st to 10th	Night	20% 5% 12% 39% 23% 1	3086
	11th to 20th	Night	25% 7% 22% 29% 16% 1	3130
	21st to end	Night	23% 6% 12% 33% 24% 3	3476
September	1st to 10th	Night	34% 6% 11% 25% 19% 6%	1900
	11th to 20th	Night	34% 5% 10% 23% 26% 3	2080
	21st to end	Night	30% 6% 9% 25% 24% 6%	2090
October	1st to 10th	Night	19% 3 6% 18% 42% 11%	3480
	11th to 20th	Night	22% 2 4 22% 31% 18%	3577
	21st to end	Night	26% 3 7% 25% 29% 11%	4399
November	1st to 10th	Night	35% 4 6% 22% 25% 7%	2536
	11th to 20th	Night	34% 4 7% 21% 27% 7%	2600
	21st to end	Night	41% 3 7% 24% 21% 5%	2600
December	1st to 10th	Night	47% 3 6% 17% 24% 2	4250
	11th to 20th	Night	48% 3 5% 23% 20% 3	4824
	21st to end	Night	57% 5% 7% 21% 8% 2	6830

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% 22% 36% 11% 5%	300
	11th to 20th	Day	31% 26% 28% 12% 2 1	300
	21st to end	Day	22% 26% 40% 9% 2	330
February	1st to 10th	Day	30% 24% 31% 13% 1 1	300
	11th to 20th	Day	38% 24% 28% 8% 2	300
	21st to end	Day	36% 26% 28% 7% 2	225
March	1st to 10th	Day	30% 19% 35% 12% 4	270
	11th to 20th	Day	26% 22% 33% 14% 5% 1	346
	21st to end	Day	26% 16% 34% 19% 5%	506
April	1st to 10th	Day	24% 15% 31% 21% 8% 2	460
	11th to 20th	Day	24% 14% 28% 23% 9% 2	452
	21st to end	Day	18% 18% 30% 21% 11% 2	460
May	1st to 10th	Day	21% 14% 29% 22% 11% 4	463
	11th to 20th	Day	15% 10% 28% 24% 18% 6%	487
	21st to end	Day	12% 6% 22% 28% 20% 12%	529
June	1st to 10th	Day	12% 4 23% 25% 20% 16%	537
	11th to 20th	Day	5% 4 18% 31% 29% 13%	680
	21st to end	Day	7% 3 22% 34% 21% 14%	680
July	1st to 10th	Day	8% 3 12% 32% 30% 15%	671
	11th to 20th	Day	9% 3 14% 27% 30% 18%	654
	21st to end	Day	9% 4 13% 29% 27% 18%	532
August	1st to 10th	Day	8% 2 14% 28% 31% 16%	486
	11th to 20th	Day	11% 3 14% 33% 30% 8%	479
	21st to end	Day	12% 3 9% 23% 34% 19%	539
September	1st to 10th	Day	9% 4 14% 31% 28% 14%	490
	11th to 20th	Day	14% 3 11% 26% 32% 14%	490
	21st to end	Day	18% 5% 17% 28% 23% 9%	490
October	1st to 10th	Day	13% 3 25% 27% 24% 8%	490
	11th to 20th	Day	13% 13% 34% 24% 13% 3	420
	21st to end	Day	26% 12% 30% 23% 8% 1	330
November	1st to 10th	Day	19% 14% 30% 25% 10% 1	300
	11th to 20th	Day	18% 17% 39% 21% 4 1	300
	21st to end	Day	23% 18% 30% 18% 10% 2	300
December	1st to 10th	Day	31% 18% 29% 18% 4 1	300
	11th to 20th	Day	25% 20% 33% 16% 6% 1	300
	21st to end	Day	26% 19% 35% 18% 1	330
January	1st to 10th	Night	24% 17% 31% 24% 4	1000
	11th to 20th	Night	27% 19% 30% 20% 4	975
	21st to end	Night	22% 14% 40% 23% 2	880
February	1st to 10th	Night	25% 14% 35% 23% 3	800
	11th to 20th	Night	30% 16% 32% 20% 2	783
	21st to end	Night	31% 18% 33% 17% 1	629
March	1st to 10th	Night	23% 16% 31% 25% 5%	760
	11th to 20th	Night	22% 13% 36% 23% 6% 1	760
	21st to end	Night	20% 14% 33% 26% 7%	691
April	1st to 10th	Night	15% 14% 33% 29% 8% 1	570
	11th to 20th	Night	20% 12% 32% 26% 9% 1	563
	21st to end	Night	16% 11% 32% 28% 12% 1	570
May	1st to 10th	Night	14% 7% 33% 27% 16% 2	570
	11th to 20th	Night	11% 5% 26% 34% 19% 4	561
	21st to end	Night	8% 3 20% 38% 26% 5%	617
June	1st to 10th	Night	11% 2 17% 35% 30% 4	570
	11th to 20th	Night	5% 1 13% 37% 37% 6%	570
	21st to end	Night	4 2 15% 36% 35% 7%	570
July	1st to 10th	Night	8% 3 9% 32% 35% 13%	555
	11th to 20th	Night	8% 2 11% 30% 40% 10%	552
	21st to end	Night	7% 2 9% 32% 42% 9%	624
August	1st to 10th	Night	7% 1 7% 32% 44% 9%	567
	11th to 20th	Night	6% 4 10% 40% 36% 5%	564
	21st to end	Night	9% 2 7% 32% 41% 9%	627
September	1st to 10th	Night	11% 3 12% 30% 40% 5%	570
	11th to 20th	Night	14% 3 11% 28% 38% 7%	750
	21st to end	Night	12% 4 18% 30% 32% 5%	760
October	1st to 10th	Night	10% 5% 18% 32% 28% 6%	760
	11th to 20th	Night	19% 7% 23% 31% 18% 1	760
	21st to end	Night	19% 7% 27% 30% 15% 2	836
November	1st to 10th	Night	16% 9% 23% 35% 16% 2	780
	11th to 20th	Night	15% 12% 34% 28% 11% 1	800
	21st to end	Night	21% 12% 28% 29% 10% 1	800
December	1st to 10th	Night	26% 13% 29% 25% 7%	800
	11th to 20th	Night	22% 11% 34% 25% 7% 1	800
	21st to end	Night	27% 15% 30% 23% 4	1025

Page generated at 2025-02-18 02:26:32. Version ac07

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