Hobbs State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hobbs State Park clear sky chart from 2005-11-06 to 2025-03-27.

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	12% 7% 3 6% 4 4 4 3 5% 7% 45%	108848
	Night	12% 7% 2 6% 4 3 4 3 5% 6% 49%	110667
Transparency	Day	37% 5% 11% 25% 19% 4	112498
	Night	35% 5% 10% 25% 20% 5%	115157
Seeing	Day	17% 11% 28% 25% 16% 4	15899
	Night	16% 12% 30% 28% 13% 1	25901

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	16% 13% 4 5% 5% 4 3 2 4 4 42%	4077
	11th to 20th	Day	7% 8% 4 8% 4 4 4 3 4 5% 49%	4080
	21st to end	Day	20% 9% 3 5% 2 3 3 2 3 4 46%	4488
February	1st to 10th	Day	18% 12% 3 6% 5% 4 4 2 3 6% 38%	1800
	11th to 20th	Day	15% 10% 3 7% 4 3 3 3 3 6% 41%	1754
	21st to end	Day	15% 11% 4 6% 4 3 4 3 4 5% 42%	1796
March	1st to 10th	Day	15% 9% 2 6% 3 3 3 3 4 5% 46%	3546
	11th to 20th	Day	12% 7% 3 5% 3 3 4 3 5% 6% 49%	3590
	21st to end	Day	16% 10% 3 8% 5% 5% 4 3 4 5% 36%	3880
April	1st to 10th	Day	12% 7% 2 6% 4 4 4 3 6% 7% 44%	2209
	11th to 20th	Day	16% 7% 3 6% 5% 4 5% 3 4 6% 40%	2254
	21st to end	Day	18% 9% 3 7% 5% 4 4 3 3 5% 39%	2280
May	1st to 10th	Day	18% 8% 3 8% 5% 5% 5% 4 6% 6% 34%	4049
	11th to 20th	Day	11% 7% 3 7% 5% 4 5% 4 6% 6% 41%	4082
	21st to end	Day	13% 6% 2 7% 5% 5% 5% 4 6% 8% 38%	4477
June	1st to 10th	Day	7% 4 2 5% 5% 4 6% 5% 7% 10% 44%	2470
	11th to 20th	Day	6% 4 2 5% 5% 6% 5% 5% 7% 9% 47%	2470
	21st to end	Day	4 3 1 4 4 5% 6% 4 6% 10% 53%	2470
July	1st to 10th	Day	10% 5% 2 6% 5% 5% 5% 5% 7% 10% 41%	4120
	11th to 20th	Day	5% 4 2 4 4 4 5% 4 7% 11% 49%	4120
	21st to end	Day	6% 4 2 6% 5% 5% 6% 5% 8% 11% 42%	4465
August	1st to 10th	Day	4 4 1 4 3 4 4 3 6% 8% 58%	4104
	11th to 20th	Day	10% 5% 2 5% 4 5% 5% 4 6% 8% 47%	3959
	21st to end	Day	4 4 2 5% 4 4 4 4 6% 9% 54%	4180
September	1st to 10th	Day	11% 5% 2 5% 3 4 3 3 5% 6% 53%	2280
	11th to 20th	Day	10% 6% 3 6% 4 4 5% 3 5% 8% 46%	2147
	21st to end	Day	6% 5% 2 5% 3 4 4 3 5% 8% 54%	2049
October	1st to 10th	Day	10% 4 2 5% 4 2 4 3 5% 7% 55%	1900
	11th to 20th	Day	13% 5% 2 4 3 2 2 2 4 5% 58%	1900
	21st to end	Day	17% 7% 3 5% 3 3 3 2 3 5% 50%	2090
November	1st to 10th	Day	12% 7% 2 4 2 4 3 2 3 6% 55%	1958
	11th to 20th	Day	12% 7% 2 5% 3 3 4 3 4 5% 50%	1965
	21st to end	Day	16% 9% 2 4 3 2 3 2 4 6% 47%	1641
December	1st to 10th	Day	12% 9% 3 5% 2 3 3 3 3 4 53%	2610
	11th to 20th	Day	12% 10% 3 6% 4 3 3 2 3 4 48%	3100
	21st to end	Day	18% 18% 6% 7% 4 3 3 3 3 4 30%	4488
January	1st to 10th	Night	14% 9% 4 9% 5% 4 3 3 4 5% 39%	5888
	11th to 20th	Night	10% 7% 2 8% 5% 4 6% 2 4 5% 48%	5900
	21st to end	Night	19% 10% 3 5% 3 2 2 2 3 5% 45%	6490
February	1st to 10th	Night	16% 10% 3 7% 3 3 3 3 4 6% 40%	2600
	11th to 20th	Night	15% 9% 3 7% 4 3 3 3 3 5% 45%	2532
	21st to end	Night	13% 9% 3 6% 4 3 3 3 5% 5% 46%	1850
March	1st to 10th	Night	17% 9% 2 6% 3 3 3 3 5% 5% 45%	3529
	11th to 20th	Night	12% 8% 2 6% 4 3 3 3 5% 6% 49%	3590
	21st to end	Night	13% 9% 3 7% 4 4 4 3 4 6% 41%	3889
April	1st to 10th	Night	12% 7% 2 5% 3 4 3 3 5% 6% 50%	1971
	11th to 20th	Night	14% 6% 2 4 3 3 5% 3 5% 7% 47%	1875
	21st to end	Night	18% 7% 2 6% 3 4 4 4 5% 5% 43%	1900
May	1st to 10th	Night	13% 8% 2 5% 4 4 4 3 5% 8% 44%	2839
	11th to 20th	Night	12% 7% 3 6% 5% 5% 4 4 6% 7% 42%	2823
	21st to end	Night	13% 6% 3 6% 4 4 4 3 6% 9% 42%	3090
June	1st to 10th	Night	6% 4 1 4 3 4 4 4 6% 9% 55%	1710
	11th to 20th	Night	5% 3 2 3 3 3 5% 4 7% 11% 55%	1710
	21st to end	Night	2 3 1 3 3 3 4 4 6% 9% 62%	1710
July	1st to 10th	Night	9% 5% 2 5% 4 3 4 4 6% 9% 49%	2850
	11th to 20th	Night	3 2 1 3 3 3 4 3 6% 9% 63%	2850
	21st to end	Night	5% 4 2 6% 4 4 4 4 7% 9% 50%	3098
August	1st to 10th	Night	2 2 1 3 4 4 4 4 7% 10% 58%	2836
	11th to 20th	Night	7% 5% 1 6% 3 4 5% 4 6% 8% 52%	2874
	21st to end	Night	3 3 1 3 3 4 3 4 7% 8% 61%	3476
September	1st to 10th	Night	7% 5% 2 4 3 3 4 3 5% 7% 58%	1900
	11th to 20th	Night	9% 5% 2 5% 4 3 3 3 5% 7% 53%	2028
	21st to end	Night	7% 5% 1 5% 4 4 3 3 5% 6% 56%	2110
October	1st to 10th	Night	6% 3 1 3 3 3 3 3 6% 8% 61%	2280
	11th to 20th	Night	13% 4 1 3 3 3 3 2 4 6% 57%	2280
	21st to end	Night	16% 6% 2 5% 2 3 3 2 3 4 52%	2508
November	1st to 10th	Night	13% 5% 1 4 3 2 3 2 3 6% 58%	2340
	11th to 20th	Night	11% 6% 1 4 2 3 4 3 4 5% 56%	2430
	21st to end	Night	14% 8% 2 5% 4 2 3 3 3 6% 50%	2752
December	1st to 10th	Night	11% 10% 3 5% 3 2 2 2 4 6% 52%	4580
	11th to 20th	Night	17% 8% 3 6% 3 3 3 2 3 4 48%	5089
	21st to end	Night	20% 15% 5% 8% 4 3 3 2 3 4 33%	6490

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	45% 3 8% 24% 17% 2	4078
	11th to 20th	Day	35% 4 10% 24% 23% 4	4080
	21st to end	Day	44% 2 6% 20% 21% 7%	4488
February	1st to 10th	Day	50% 4 9% 21% 13% 3	1800
	11th to 20th	Day	46% 3 9% 22% 17% 3	1763
	21st to end	Day	45% 3 7% 20% 17% 8%	1796
March	1st to 10th	Day	40% 5% 6% 19% 19% 10%	3546
	11th to 20th	Day	36% 4 11% 23% 20% 5%	3590
	21st to end	Day	49% 5% 9% 24% 12% 1	3880
April	1st to 10th	Day	39% 4 12% 24% 18% 4	2209
	11th to 20th	Day	45% 5% 11% 18% 17% 3	2254
	21st to end	Day	49% 5% 8% 22% 14% 2	2280
May	1st to 10th	Day	47% 7% 10% 20% 14% 1	4087
	11th to 20th	Day	41% 8% 12% 24% 14%	4086
	21st to end	Day	41% 9% 14% 21% 14% 1	4489
June	1st to 10th	Day	33% 7% 17% 28% 13% 1	2470
	11th to 20th	Day	31% 6% 14% 29% 16% 2	2470
	21st to end	Day	25% 7% 16% 30% 18% 4	2470
July	1st to 10th	Day	35% 8% 18% 24% 14% 2	4056
	11th to 20th	Day	26% 7% 14% 34% 18% 1	4051
	21st to end	Day	31% 10% 21% 28% 9%	4325
August	1st to 10th	Day	24% 6% 16% 29% 21% 4	4090
	11th to 20th	Day	35% 7% 15% 28% 14% 1	3998
	21st to end	Day	26% 6% 15% 36% 14% 3	4179
September	1st to 10th	Day	32% 5% 11% 26% 18% 9%	2280
	11th to 20th	Day	35% 5% 11% 22% 24% 3	2147
	21st to end	Day	30% 5% 9% 26% 27% 4	2049
October	1st to 10th	Day	17% 3 6% 17% 39% 18%	3160
	11th to 20th	Day	19% 3 5% 19% 38% 16%	3140
	21st to end	Day	28% 3 9% 31% 24% 5%	3428
November	1st to 10th	Day	32% 4 8% 27% 23% 8%	1958
	11th to 20th	Day	35% 3 7% 23% 22% 10%	1965
	21st to end	Day	39% 3 8% 21% 25% 4	1641
December	1st to 10th	Day	37% 3 7% 29% 23% 2	2610
	11th to 20th	Day	41% 3 5% 25% 24% 3	3097
	21st to end	Day	56% 5% 7% 19% 12% 2	4488
January	1st to 10th	Night	46% 5% 10% 21% 14% 4	5888
	11th to 20th	Night	36% 4 11% 19% 28% 3	5900
	21st to end	Night	45% 2 7% 18% 24% 4	6490
February	1st to 10th	Night	45% 3 10% 23% 15% 4	2600
	11th to 20th	Night	44% 3 8% 25% 17% 4	2533
	21st to end	Night	41% 3 8% 19% 23% 7%	1850
March	1st to 10th	Night	42% 5% 7% 19% 18% 9%	3529
	11th to 20th	Night	36% 5% 10% 26% 19% 4	3590
	21st to end	Night	43% 6% 10% 26% 13% 1	3889
April	1st to 10th	Night	35% 4 11% 25% 20% 6%	1971
	11th to 20th	Night	35% 5% 10% 24% 22% 5%	1875
	21st to end	Night	42% 6% 10% 25% 16% 2	1900
May	1st to 10th	Night	37% 7% 13% 24% 16% 4	2866
	11th to 20th	Night	38% 8% 15% 24% 14% 1	2824
	21st to end	Night	37% 8% 15% 27% 13% 1	3099
June	1st to 10th	Night	23% 7% 16% 32% 17% 3	1710
	11th to 20th	Night	21% 7% 15% 33% 21% 3	1710
	21st to end	Night	18% 6% 15% 32% 23% 6%	1710
July	1st to 10th	Night	30% 7% 20% 24% 15% 4	2805
	11th to 20th	Night	18% 6% 12% 39% 23% 2	2796
	21st to end	Night	27% 8% 18% 33% 13%	2999
August	1st to 10th	Night	19% 6% 16% 35% 23% 1	2826
	11th to 20th	Night	29% 7% 18% 27% 17% 2	2901
	21st to end	Night	19% 6% 14% 37% 22% 3	3476
September	1st to 10th	Night	25% 5% 11% 30% 20% 9%	1900
	11th to 20th	Night	32% 5% 10% 22% 26% 5%	2028
	21st to end	Night	28% 4 8% 24% 30% 5%	2110
October	1st to 10th	Night	13% 3 8% 15% 37% 25%	3800
	11th to 20th	Night	20% 3 5% 18% 33% 21%	3779
	21st to end	Night	28% 3 7% 31% 23% 8%	4120
November	1st to 10th	Night	30% 3 8% 25% 25% 9%	2340
	11th to 20th	Night	31% 3 7% 23% 26% 9%	2430
	21st to end	Night	38% 3 7% 22% 25% 5%	2752
December	1st to 10th	Night	35% 3 8% 34% 17% 2	4580
	11th to 20th	Night	42% 3 5% 22% 23% 5%	5091
	21st to end	Night	55% 4 8% 21% 9% 3	6490

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	27% 18% 38% 13% 3	300
	11th to 20th	Day	25% 24% 38% 12% 1	300
	21st to end	Day	25% 21% 38% 12% 4	330
February	1st to 10th	Day	34% 22% 32% 10% 2	300
	11th to 20th	Day	28% 29% 31% 11% 1	300
	21st to end	Day	33% 23% 34% 8% 2	249
March	1st to 10th	Day	25% 25% 33% 14% 3	300
	11th to 20th	Day	30% 21% 36% 11% 1	300
	21st to end	Day	32% 22% 36% 8% 2	315
April	1st to 10th	Day	25% 25% 31% 12% 6% 1	389
	11th to 20th	Day	27% 17% 35% 15% 5%	452
	21st to end	Day	28% 18% 28% 20% 5%	460
May	1st to 10th	Day	20% 15% 39% 19% 6%	633
	11th to 20th	Day	17% 10% 34% 25% 13% 1	675
	21st to end	Day	12% 11% 36% 22% 14% 4	734
June	1st to 10th	Day	11% 3 22% 35% 23% 6%	680
	11th to 20th	Day	7% 4 26% 37% 21% 6%	680
	21st to end	Day	3 4 32% 35% 22% 4	680
July	1st to 10th	Day	9% 4 17% 33% 28% 9%	671
	11th to 20th	Day	5% 1 17% 38% 30% 8%	668
	21st to end	Day	8% 2 12% 34% 33% 10%	739
August	1st to 10th	Day	9% 3 14% 40% 29% 4	676
	11th to 20th	Day	14% 2 11% 34% 31% 8%	622
	21st to end	Day	9% 2 11% 34% 31% 13%	539
September	1st to 10th	Day	12% 2 13% 34% 30% 8%	490
	11th to 20th	Day	7% 3 20% 41% 22% 7%	357
	21st to end	Day	11% 5% 26% 30% 22% 5%	300
October	1st to 10th	Day	11% 8% 28% 30% 17% 6%	300
	11th to 20th	Day	14% 11% 44% 19% 10% 1	300
	21st to end	Day	28% 16% 34% 17% 5%	330
November	1st to 10th	Day	18% 16% 40% 16% 8% 2	300
	11th to 20th	Day	18% 17% 40% 14% 10% 1	300
	21st to end	Day	27% 18% 31% 20% 4 1	300
December	1st to 10th	Day	20% 21% 36% 15% 6% 1	300
	11th to 20th	Day	22% 23% 35% 14% 5% 1	300
	21st to end	Day	26% 24% 35% 12% 2	330
January	1st to 10th	Night	21% 19% 34% 23% 4	1000
	11th to 20th	Night	21% 23% 36% 17% 3	1000
	21st to end	Night	19% 21% 35% 21% 4	1100
February	1st to 10th	Night	23% 19% 37% 19% 3	1000
	11th to 20th	Night	21% 21% 38% 16% 2	978
	21st to end	Night	22% 20% 37% 19% 1	530
March	1st to 10th	Night	24% 15% 36% 23% 3	600
	11th to 20th	Night	24% 16% 34% 23% 4	600
	21st to end	Night	21% 15% 41% 17% 5%	647
April	1st to 10th	Night	17% 19% 36% 24% 4	570
	11th to 20th	Night	18% 15% 37% 23% 7%	563
	21st to end	Night	20% 15% 37% 19% 8%	570
May	1st to 10th	Night	15% 7% 39% 30% 8%	570
	11th to 20th	Night	16% 8% 28% 34% 13% 1	561
	21st to end	Night	14% 6% 29% 31% 16% 4	617
June	1st to 10th	Night	8% 4 17% 40% 30% 1	570
	11th to 20th	Night	5% 2 27% 42% 22% 2	570
	21st to end	Night	3 2 22% 46% 25% 3	570
July	1st to 10th	Night	6% 2 13% 38% 37% 4	555
	11th to 20th	Night	4 1 11% 46% 32% 5%	552
	21st to end	Night	6% 2 8% 43% 35% 6%	624
August	1st to 10th	Night	5% 1 12% 42% 37% 4	567
	11th to 20th	Night	8% 1 13% 42% 32% 4	564
	21st to end	Night	6% 1 13% 40% 34% 6%	627
September	1st to 10th	Night	10% 2 13% 42% 31% 3	570
	11th to 20th	Night	11% 2 15% 40% 28% 4	570
	21st to end	Night	9% 5% 20% 38% 25% 4	590
October	1st to 10th	Night	7% 4 26% 35% 23% 4	760
	11th to 20th	Night	14% 9% 35% 30% 12%	760
	21st to end	Night	21% 12% 33% 24% 11%	836
November	1st to 10th	Night	15% 11% 36% 27% 11% 1	780
	11th to 20th	Night	16% 14% 33% 29% 7%	830
	21st to end	Night	21% 15% 33% 23% 7%	1000
December	1st to 10th	Night	20% 14% 38% 22% 5%	1000
	11th to 20th	Night	24% 15% 32% 25% 4	1000
	21st to end	Night	23% 19% 35% 20% 4	1100

Page generated at 2025-03-24 08:04:30. Version ac07

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