Lamoria Springs Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lamoria Springs Observatory clear sky chart from 2005-11-06 to 2026-04-17.

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% 10% 4 9% 6% 5% 5% 4 6% 7% 32%	130889
	Night	13% 11% 4 9% 5% 5% 4 4 5% 7% 34%	131358
Transparency	Day	48% 7% 12% 20% 12% 1	134446
	Night	48% 6% 12% 21% 12% 1	135872
Seeing	Day	16% 12% 30% 24% 13% 5%	17176
	Night	18% 10% 31% 29% 11% 1	26825

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	12% 14% 8% 14% 6% 5% 4 4 5% 5% 23%	4691
	11th to 20th	Day	11% 17% 7% 17% 10% 9% 5% 3 4 4 13%	4710
	21st to end	Day	15% 14% 5% 11% 9% 6% 6% 4 4 5% 20%	5697
February	1st to 10th	Day	12% 15% 5% 14% 7% 6% 5% 3 5% 5% 22%	1890
	11th to 20th	Day	13% 13% 6% 11% 7% 5% 5% 4 5% 6% 24%	1932
	21st to end	Day	13% 15% 5% 11% 8% 5% 4 4 5% 5% 25%	1730
March	1st to 10th	Day	14% 12% 4 10% 7% 5% 4 3 5% 6% 31%	4739
	11th to 20th	Day	12% 13% 5% 9% 6% 5% 5% 4 5% 8% 29%	5090
	21st to end	Day	16% 14% 5% 11% 6% 5% 4 4 4 5% 25%	5586
April	1st to 10th	Day	16% 13% 4 9% 6% 4 5% 4 6% 6% 29%	2417
	11th to 20th	Day	15% 10% 3 7% 4 5% 3 4 5% 7% 36%	2650
	21st to end	Day	15% 10% 3 9% 5% 4 4 4 5% 7% 34%	2600
May	1st to 10th	Day	16% 9% 3 8% 5% 4 4 4 5% 6% 35%	5862
	11th to 20th	Day	16% 9% 3 7% 4 5% 4 4 7% 8% 34%	5861
	21st to end	Day	14% 8% 3 7% 4 5% 4 4 5% 6% 40%	6616
June	1st to 10th	Day	10% 6% 3 6% 5% 5% 5% 5% 7% 10% 40%	3000
	11th to 20th	Day	9% 6% 3 6% 4 5% 5% 4 7% 9% 41%	3000
	21st to end	Day	10% 6% 2 7% 5% 5% 5% 5% 7% 9% 39%	3000
July	1st to 10th	Day	9% 7% 3 7% 6% 5% 5% 5% 7% 10% 37%	6499
	11th to 20th	Day	8% 5% 2 6% 4 5% 6% 5% 7% 9% 44%	6360
	21st to end	Day	7% 5% 2 6% 5% 5% 5% 4 7% 10% 45%	6527
August	1st to 10th	Day	11% 5% 2 6% 6% 5% 5% 5% 7% 8% 38%	4234
	11th to 20th	Day	10% 6% 3 6% 5% 5% 6% 6% 7% 10% 37%	4174
	21st to end	Day	9% 6% 2 7% 5% 5% 6% 5% 7% 9% 40%	4675
September	1st to 10th	Day	9% 7% 2 7% 6% 5% 5% 4 6% 9% 40%	2278
	11th to 20th	Day	11% 5% 2 6% 4 4 4 3 7% 8% 47%	2200
	21st to end	Day	14% 8% 3 7% 5% 5% 6% 4 6% 9% 35%	2200
October	1st to 10th	Day	13% 6% 3 7% 5% 5% 5% 3 5% 6% 40%	2110
	11th to 20th	Day	17% 10% 3 8% 5% 5% 5% 3 5% 7% 31%	2000
	21st to end	Day	20% 10% 3 8% 5% 6% 5% 4 6% 7% 28%	2053
November	1st to 10th	Day	14% 11% 4 8% 6% 5% 5% 4 6% 7% 32%	1852
	11th to 20th	Day	14% 12% 4 11% 6% 5% 5% 3 6% 7% 27%	1845
	21st to end	Day	16% 15% 4 10% 6% 5% 5% 4 5% 5% 25%	1680
December	1st to 10th	Day	14% 14% 5% 10% 6% 6% 6% 4 7% 8% 19%	2680
	11th to 20th	Day	17% 19% 5% 9% 5% 4 5% 3 5% 5% 23%	2804
	21st to end	Day	24% 21% 8% 13% 5% 4 4 3 4 4 12%	3647
January	1st to 10th	Night	14% 13% 5% 11% 5% 5% 4 3 5% 6% 29%	8232
	11th to 20th	Night	9% 16% 7% 16% 8% 8% 5% 4 5% 6% 18%	8280
	21st to end	Night	11% 14% 8% 11% 6% 5% 5% 4 6% 6% 25%	8484
February	1st to 10th	Night	14% 15% 5% 11% 7% 5% 4 4 6% 4 25%	2730
	11th to 20th	Night	13% 14% 4 11% 5% 4 5% 4 6% 6% 28%	2569
	21st to end	Night	16% 13% 4 11% 7% 5% 4 4 5% 5% 27%	2076
March	1st to 10th	Night	13% 11% 4 8% 4 4 4 3 4 7% 37%	5334
	11th to 20th	Night	9% 8% 3 8% 5% 4 4 4 7% 9% 37%	5090
	21st to end	Night	15% 10% 4 8% 5% 4 4 3 4 5% 37%	5588
April	1st to 10th	Night	16% 12% 3 8% 5% 4 4 3 5% 7% 33%	2220
	11th to 20th	Night	17% 9% 2 6% 5% 4 5% 3 5% 6% 37%	1831
	21st to end	Night	16% 9% 3 7% 5% 4 4 4 5% 7% 35%	1800
May	1st to 10th	Night	17% 10% 3 7% 5% 4 4 4 5% 8% 34%	4033
	11th to 20th	Night	13% 10% 3 8% 5% 4 4 3 5% 6% 38%	4032
	21st to end	Night	16% 5% 2 5% 3 4 4 4 5% 7% 45%	4203
June	1st to 10th	Night	12% 4 2 6% 5% 4 5% 4 5% 8% 44%	1400
	11th to 20th	Night	10% 6% 2 5% 4 4 5% 5% 7% 9% 43%	1400
	21st to end	Night	7% 5% 2 6% 5% 5% 4 4 6% 10% 46%	1400
July	1st to 10th	Night	7% 6% 2 7% 4 4 5% 4 6% 10% 46%	3473
	11th to 20th	Night	8% 4 1 5% 4 4 4 4 6% 9% 50%	3617
	21st to end	Night	7% 4 2 5% 5% 5% 5% 4 6% 8% 48%	4314
August	1st to 10th	Night	9% 6% 3 6% 4 3 4 4 6% 8% 47%	2915
	11th to 20th	Night	9% 7% 2 6% 4 4 5% 4 5% 8% 46%	2875
	21st to end	Night	7% 6% 2 6% 5% 4 5% 4 7% 8% 47%	3223
September	1st to 10th	Night	9% 6% 2 7% 4 5% 4 4 7% 7% 47%	2098
	11th to 20th	Night	9% 4 2 4 3 2 4 3 5% 7% 56%	2200
	21st to end	Night	14% 7% 3 6% 5% 4 3 3 5% 7% 42%	2200
October	1st to 10th	Night	15% 6% 2 7% 3 3 4 3 6% 7% 46%	2289
	11th to 20th	Night	18% 9% 3 8% 4 5% 4 3 5% 6% 35%	2400
	21st to end	Night	19% 9% 3 8% 6% 5% 4 3 5% 6% 31%	2785
November	1st to 10th	Night	12% 9% 3 7% 4 4 4 4 7% 6% 40%	2666
	11th to 20th	Night	13% 12% 4 8% 6% 5% 5% 5% 6% 7% 29%	2772
	21st to end	Night	19% 14% 4 8% 5% 4 4 4 5% 6% 26%	2940
December	1st to 10th	Night	13% 15% 5% 10% 6% 5% 6% 5% 7% 7% 22%	4720
	11th to 20th	Night	13% 18% 6% 11% 5% 5% 5% 4 5% 6% 24%	5614
	21st to end	Night	22% 20% 7% 11% 5% 4 4 3 4 4 16%	7555

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	61% 6% 11% 15% 6% 1	4692
	11th to 20th	Day	73% 6% 6% 9% 6%	4710
	21st to end	Day	65% 6% 10% 10% 9% 1	5697
February	1st to 10th	Day	62% 5% 10% 15% 7%	1890
	11th to 20th	Day	60% 6% 10% 15% 9% 1	1941
	21st to end	Day	60% 6% 10% 15% 8% 1	1730
March	1st to 10th	Day	54% 5% 14% 18% 9% 1	4739
	11th to 20th	Day	52% 5% 14% 19% 9% 1	5090
	21st to end	Day	59% 6% 11% 15% 8% 1	5586
April	1st to 10th	Day	55% 5% 11% 18% 10% 1	2417
	11th to 20th	Day	47% 6% 12% 19% 14% 1	2650
	21st to end	Day	49% 6% 13% 18% 12% 1	2600
May	1st to 10th	Day	47% 6% 13% 16% 14% 5%	5897
	11th to 20th	Day	46% 8% 11% 20% 14% 2	5865
	21st to end	Day	43% 6% 9% 19% 18% 5%	6631
June	1st to 10th	Day	38% 7% 13% 25% 15% 2	3000
	11th to 20th	Day	38% 7% 13% 24% 16% 2	3000
	21st to end	Day	39% 8% 13% 25% 15% 1	3000
July	1st to 10th	Day	39% 8% 14% 24% 14% 2	6430
	11th to 20th	Day	32% 8% 13% 30% 15% 1	6285
	21st to end	Day	32% 7% 15% 24% 20% 1	6341
August	1st to 10th	Day	38% 9% 14% 21% 16% 1	4221
	11th to 20th	Day	38% 9% 15% 27% 10% 1	4213
	21st to end	Day	37% 8% 13% 29% 13% 1	4674
September	1st to 10th	Day	39% 8% 14% 25% 12% 1	2278
	11th to 20th	Day	34% 6% 13% 32% 14% 1	2200
	21st to end	Day	46% 8% 13% 22% 11% 1	2200
October	1st to 10th	Day	33% 5% 11% 34% 15% 2	3435
	11th to 20th	Day	42% 7% 12% 24% 15%	3240
	21st to end	Day	49% 6% 13% 22% 10%	3290
November	1st to 10th	Day	50% 7% 12% 22% 9% 1	1852
	11th to 20th	Day	55% 7% 14% 15% 9%	1845
	21st to end	Day	59% 6% 13% 16% 5%	1680
December	1st to 10th	Day	61% 8% 18% 10% 3	2680
	11th to 20th	Day	63% 4 11% 14% 7%	2800
	21st to end	Day	75% 5% 7% 8% 5%	3647
January	1st to 10th	Night	54% 5% 13% 18% 8% 2	8233
	11th to 20th	Night	65% 6% 8% 12% 7% 1	8280
	21st to end	Night	58% 5% 10% 18% 10%	8484
February	1st to 10th	Night	60% 6% 10% 16% 7% 1	2730
	11th to 20th	Night	55% 6% 10% 19% 10% 1	2571
	21st to end	Night	58% 5% 10% 19% 8% 1	2076
March	1st to 10th	Night	47% 4 16% 22% 11% 1	5334
	11th to 20th	Night	42% 5% 17% 24% 12% 1	5090
	21st to end	Night	48% 6% 12% 20% 13% 1	5588
April	1st to 10th	Night	50% 6% 10% 20% 12% 2	2220
	11th to 20th	Night	46% 5% 11% 18% 18% 2	1831
	21st to end	Night	46% 7% 10% 18% 16% 3	1800
May	1st to 10th	Night	48% 6% 9% 17% 13% 6%	4060
	11th to 20th	Night	44% 7% 11% 23% 13% 2	4033
	21st to end	Night	37% 7% 10% 26% 15% 5%	4210
June	1st to 10th	Night	36% 7% 12% 25% 18% 2	1400
	11th to 20th	Night	35% 8% 13% 23% 18% 3	1400
	21st to end	Night	33% 6% 14% 26% 19% 1	1400
July	1st to 10th	Night	32% 6% 15% 24% 18% 5%	3435
	11th to 20th	Night	29% 7% 13% 31% 20% 1	3572
	21st to end	Night	32% 7% 14% 23% 23% 1	4187
August	1st to 10th	Night	34% 6% 15% 27% 16% 1	2904
	11th to 20th	Night	35% 7% 14% 30% 13% 2	2902
	21st to end	Night	32% 8% 13% 32% 13% 1	3223
September	1st to 10th	Night	35% 7% 13% 30% 14% 1	2098
	11th to 20th	Night	27% 7% 13% 34% 18% 1	2200
	21st to end	Night	41% 6% 12% 28% 12% 2	2200
October	1st to 10th	Night	25% 6% 11% 31% 26% 1	3744
	11th to 20th	Night	44% 5% 10% 24% 16% 1	3899
	21st to end	Night	44% 5% 11% 27% 12% 1	4498
November	1st to 10th	Night	42% 6% 13% 26% 12% 1	2666
	11th to 20th	Night	52% 7% 13% 18% 9% 1	2772
	21st to end	Night	57% 6% 15% 16% 5% 1	2940
December	1st to 10th	Night	58% 7% 19% 13% 3	4720
	11th to 20th	Night	60% 6% 10% 13% 10% 1	5617
	21st to end	Night	71% 6% 10% 9% 5%	7555

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	21% 18% 38% 19% 4	330
	11th to 20th	Day	20% 18% 42% 16% 3 1	330
	21st to end	Day	23% 17% 35% 20% 4 1	363
February	1st to 10th	Day	19% 23% 37% 15% 5% 1	330
	11th to 20th	Day	20% 19% 42% 18% 2	330
	21st to end	Day	18% 28% 38% 13% 2	273
March	1st to 10th	Day	24% 16% 40% 16% 4	398
	11th to 20th	Day	22% 16% 32% 22% 8% 1	540
	21st to end	Day	24% 14% 34% 21% 6% 1	594
April	1st to 10th	Day	19% 19% 35% 19% 7% 1	540
	11th to 20th	Day	24% 16% 30% 16% 10% 4	516
	21st to end	Day	20% 14% 30% 24% 11% 2	500
May	1st to 10th	Day	17% 14% 32% 23% 11% 3	503
	11th to 20th	Day	17% 9% 29% 25% 14% 5%	527
	21st to end	Day	14% 8% 26% 28% 17% 7%	573
June	1st to 10th	Day	12% 8% 33% 30% 13% 4	730
	11th to 20th	Day	12% 8% 32% 30% 15% 4	730
	21st to end	Day	12% 7% 30% 33% 15% 4	730
July	1st to 10th	Day	8% 5% 23% 34% 21% 9%	721
	11th to 20th	Day	10% 6% 26% 31% 19% 8%	718
	21st to end	Day	7% 4 25% 32% 24% 9%	627
August	1st to 10th	Day	9% 4 20% 30% 24% 14%	526
	11th to 20th	Day	11% 4 18% 32% 22% 13%	519
	21st to end	Day	11% 4 22% 27% 24% 11%	583
September	1st to 10th	Day	12% 6% 25% 25% 21% 12%	530
	11th to 20th	Day	9% 4 17% 26% 28% 16%	530
	21st to end	Day	15% 12% 22% 25% 18% 8%	530
October	1st to 10th	Day	15% 9% 29% 22% 19% 6%	530
	11th to 20th	Day	17% 17% 32% 26% 7% 2	530
	21st to end	Day	20% 20% 33% 20% 6% 1	436
November	1st to 10th	Day	18% 19% 32% 22% 8% 1	330
	11th to 20th	Day	20% 22% 35% 16% 6% 1	305
	21st to end	Day	21% 20% 37% 18% 4	220
December	1st to 10th	Day	23% 17% 37% 16% 7%	220
	11th to 20th	Day	26% 20% 36% 14% 3	220
	21st to end	Day	26% 20% 36% 15% 3	264
January	1st to 10th	Night	20% 17% 38% 19% 5% 1	1050
	11th to 20th	Night	20% 17% 37% 22% 3 1	1050
	21st to end	Night	17% 13% 37% 26% 6%	955
February	1st to 10th	Night	21% 14% 39% 22% 3	840
	11th to 20th	Night	20% 16% 33% 25% 5%	823
	21st to end	Night	21% 16% 40% 21% 3	692
March	1st to 10th	Night	19% 12% 35% 27% 6%	840
	11th to 20th	Night	17% 15% 37% 25% 6% 1	840
	21st to end	Night	21% 13% 31% 28% 6%	924
April	1st to 10th	Night	22% 14% 34% 25% 5%	755
	11th to 20th	Night	22% 11% 32% 24% 9% 2	611
	21st to end	Night	20% 8% 32% 32% 8% 1	600
May	1st to 10th	Night	17% 6% 30% 35% 11% 1	600
	11th to 20th	Night	18% 6% 28% 35% 13% 1	591
	21st to end	Night	13% 3 27% 35% 20% 2	565
June	1st to 10th	Night	14% 4 28% 40% 15%	400
	11th to 20th	Night	14% 4 29% 38% 16%	400
	21st to end	Night	9% 5% 25% 44% 17% 1	400
July	1st to 10th	Night	7% 2 16% 45% 27% 3	518
	11th to 20th	Night	10% 2 17% 43% 24% 4	582
	21st to end	Night	7% 2 18% 49% 24% 1	657
August	1st to 10th	Night	8% 2 15% 44% 28% 4	597
	11th to 20th	Night	8% 2 18% 37% 31% 4	594
	21st to end	Night	11% 3 18% 38% 27% 4	660
September	1st to 10th	Night	11% 6% 23% 33% 22% 5%	735
	11th to 20th	Night	10% 4 15% 36% 29% 6%	800
	21st to end	Night	16% 8% 22% 31% 18% 5%	800
October	1st to 10th	Night	16% 6% 29% 28% 20% 1	800
	11th to 20th	Night	21% 12% 32% 26% 8% 1	800
	21st to end	Night	23% 11% 35% 26% 4	880
November	1st to 10th	Night	19% 12% 32% 27% 9% 1	820
	11th to 20th	Night	18% 16% 37% 21% 6% 1	840
	21st to end	Night	24% 16% 36% 20% 4	840
December	1st to 10th	Night	23% 15% 38% 20% 4	840
	11th to 20th	Night	22% 15% 40% 19% 3	971
	21st to end	Night	30% 13% 35% 20% 2	1155

Page generated at 2026-04-14 02:44:28. Version ac07

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