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 2024-12-24.

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 8% 5% 5% 5% 4 6% 7% 33%	101540
	Night	14% 11% 4 8% 5% 5% 4 4 5% 7% 34%	98551
Transparency	Day	47% 7% 13% 20% 11% 1	105141
	Night	47% 6% 12% 22% 12% 1	103090
Seeing	Day	16% 11% 30% 25% 14% 5%	15464
	Night	18% 10% 31% 29% 11% 1	25042

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% 17% 9% 12% 5% 5% 4 3 5% 4 20%	2527
	11th to 20th	Day	14% 19% 7% 16% 8% 8% 4 3 5% 5% 12%	2530
	21st to end	Day	23% 20% 6% 10% 6% 5% 4 3 4 5% 16%	3067
February	1st to 10th	Day	12% 15% 5% 15% 7% 6% 5% 3 5% 5% 21%	1710
	11th to 20th	Day	12% 13% 6% 11% 7% 5% 5% 4 5% 6% 25%	1743
	21st to end	Day	14% 15% 5% 11% 8% 5% 4 3 5% 5% 26%	1570
March	1st to 10th	Day	16% 15% 4 10% 5% 4 4 3 4 5% 28%	3234
	11th to 20th	Day	12% 14% 6% 9% 6% 5% 5% 4 5% 7% 27%	3480
	21st to end	Day	16% 13% 4 11% 6% 5% 5% 4 5% 5% 27%	3815
April	1st to 10th	Day	15% 13% 4 9% 6% 4 5% 4 6% 6% 29%	2187
	11th to 20th	Day	16% 10% 3 7% 5% 5% 3 4 5% 7% 36%	2442
	21st to end	Day	15% 10% 3 9% 5% 4 4 4 5% 7% 33%	2470
May	1st to 10th	Day	15% 8% 3 8% 5% 4 4 4 5% 7% 36%	4082
	11th to 20th	Day	16% 9% 3 7% 4 5% 4 4 7% 8% 33%	4081
	21st to end	Day	10% 7% 2 6% 4 4 4 4 5% 7% 46%	4603
June	1st to 10th	Day	10% 6% 3 6% 5% 5% 5% 5% 7% 9% 39%	2850
	11th to 20th	Day	9% 6% 3 6% 5% 5% 5% 4 7% 9% 42%	2850
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 5% 7% 9% 39%	2850
July	1st to 10th	Day	9% 7% 3 7% 6% 5% 6% 5% 8% 9% 36%	4537
	11th to 20th	Day	8% 4 2 5% 4 5% 6% 5% 7% 10% 43%	4440
	21st to end	Day	7% 5% 2 6% 6% 6% 6% 5% 8% 10% 40%	4541
August	1st to 10th	Day	11% 6% 2 6% 6% 5% 5% 5% 7% 8% 38%	4104
	11th to 20th	Day	10% 6% 2 6% 5% 5% 6% 5% 7% 10% 38%	4044
	21st to end	Day	9% 6% 2 7% 5% 5% 6% 5% 7% 9% 40%	4532
September	1st to 10th	Day	9% 7% 2 7% 6% 5% 5% 4 6% 9% 39%	2165
	11th to 20th	Day	11% 5% 2 6% 4 4 5% 3 7% 8% 46%	2090
	21st to end	Day	15% 7% 3 7% 5% 5% 6% 4 6% 9% 34%	2090
October	1st to 10th	Day	14% 6% 3 8% 5% 5% 5% 3 5% 6% 39%	2005
	11th to 20th	Day	17% 10% 3 8% 5% 5% 5% 3 5% 7% 30%	1900
	21st to end	Day	20% 10% 3 8% 5% 6% 5% 4 6% 7% 27%	1951
November	1st to 10th	Day	14% 11% 4 8% 6% 5% 5% 4 5% 7% 32%	1762
	11th to 20th	Day	14% 12% 4 11% 6% 5% 6% 3 6% 7% 27%	1757
	21st to end	Day	16% 15% 4 10% 6% 5% 5% 4 4 5% 25%	1600
December	1st to 10th	Day	13% 15% 6% 12% 7% 6% 6% 4 5% 6% 20%	1600
	11th to 20th	Day	17% 16% 5% 9% 6% 5% 5% 4 5% 6% 24%	1815
	21st to end	Day	25% 22% 8% 11% 5% 4 4 3 4 4 11%	2516
January	1st to 10th	Night	16% 14% 6% 11% 5% 5% 4 3 4 6% 26%	4428
	11th to 20th	Night	13% 15% 7% 16% 9% 9% 5% 3 4 5% 14%	4440
	21st to end	Night	18% 17% 9% 11% 6% 4 4 3 4 5% 20%	4587
February	1st to 10th	Night	15% 15% 5% 11% 7% 5% 4 4 6% 4 23%	2470
	11th to 20th	Night	13% 14% 4 10% 5% 5% 5% 4 7% 6% 27%	2319
	21st to end	Night	16% 12% 4 10% 7% 5% 5% 4 5% 5% 27%	1884
March	1st to 10th	Night	13% 12% 4 8% 4 4 4 3 4 7% 37%	3619
	11th to 20th	Night	8% 8% 4 7% 6% 4 5% 4 6% 9% 40%	3480
	21st to end	Night	15% 10% 4 9% 5% 4 4 3 4 5% 37%	3817
April	1st to 10th	Night	17% 12% 3 7% 4 3 4 3 5% 7% 34%	2008
	11th to 20th	Night	18% 8% 2 6% 4 4 5% 3 5% 7% 38%	1687
	21st to end	Night	16% 10% 3 7% 5% 4 3 4 5% 7% 35%	1710
May	1st to 10th	Night	15% 10% 3 6% 5% 4 4 4 5% 8% 36%	2813
	11th to 20th	Night	13% 9% 3 8% 5% 4 4 3 5% 6% 40%	2812
	21st to end	Night	10% 5% 2 5% 4 4 4 4 5% 8% 50%	2917
June	1st to 10th	Night	12% 4 2 6% 5% 4 5% 4 5% 8% 44%	1330
	11th to 20th	Night	10% 6% 2 5% 4 4 5% 5% 7% 9% 44%	1330
	21st to end	Night	7% 5% 2 5% 5% 5% 4 4 6% 10% 46%	1330
July	1st to 10th	Night	7% 5% 2 7% 4 4 5% 4 6% 10% 47%	2427
	11th to 20th	Night	10% 3 1 4 4 4 4 3 6% 8% 54%	2530
	21st to end	Night	5% 4 2 5% 5% 6% 6% 4 7% 8% 47%	3013
August	1st to 10th	Night	10% 6% 3 6% 4 3 4 4 6% 8% 46%	2825
	11th to 20th	Night	9% 7% 2 6% 4 4 5% 4 6% 8% 46%	2785
	21st to end	Night	7% 6% 2 6% 5% 4 5% 4 7% 8% 47%	3124
September	1st to 10th	Night	9% 6% 2 7% 4 5% 4 4 7% 7% 46%	1993
	11th to 20th	Night	10% 4 2 4 3 2 4 4 5% 7% 54%	2090
	21st to end	Night	14% 7% 3 6% 5% 4 3 3 5% 7% 43%	2090
October	1st to 10th	Night	15% 6% 2 7% 3 3 4 3 6% 7% 44%	2174
	11th to 20th	Night	18% 9% 3 8% 4 5% 4 3 5% 6% 35%	2280
	21st to end	Night	20% 10% 3 8% 6% 4 4 4 5% 6% 30%	2646
November	1st to 10th	Night	12% 9% 3 7% 4 4 4 4 7% 6% 40%	2536
	11th to 20th	Night	14% 13% 4 8% 6% 5% 5% 5% 6% 7% 29%	2640
	21st to end	Night	19% 14% 4 8% 5% 4 4 4 5% 6% 26%	2800
December	1st to 10th	Night	16% 15% 5% 10% 6% 5% 6% 4 6% 6% 21%	2800
	11th to 20th	Night	14% 14% 6% 12% 6% 5% 6% 4 6% 6% 23%	3597
	21st to end	Night	24% 21% 7% 10% 5% 4 3 3 3 4 14%	5220

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	65% 6% 11% 13% 4 1	2528
	11th to 20th	Day	73% 8% 8% 9% 2	2530
	21st to end	Day	71% 6% 12% 7% 3	3067
February	1st to 10th	Day	64% 5% 11% 14% 6%	1710
	11th to 20th	Day	59% 6% 10% 15% 9% 1	1752
	21st to end	Day	59% 6% 11% 16% 7% 1	1570
March	1st to 10th	Day	58% 5% 12% 19% 6% 1	3234
	11th to 20th	Day	54% 6% 12% 18% 8% 2	3480
	21st to end	Day	56% 7% 11% 14% 9% 2	3815
April	1st to 10th	Day	54% 5% 11% 18% 10% 1	2187
	11th to 20th	Day	47% 6% 12% 19% 14% 2	2442
	21st to end	Day	50% 6% 13% 17% 12% 2	2470
May	1st to 10th	Day	45% 7% 12% 19% 14% 3	4120
	11th to 20th	Day	45% 9% 14% 21% 10% 1	4085
	21st to end	Day	36% 7% 10% 19% 22% 6%	4617
June	1st to 10th	Day	39% 7% 13% 25% 15% 2	2850
	11th to 20th	Day	37% 7% 13% 24% 17% 2	2850
	21st to end	Day	39% 8% 13% 25% 14% 1	2850
July	1st to 10th	Day	41% 8% 14% 20% 15% 3	4468
	11th to 20th	Day	30% 8% 14% 33% 13% 1	4365
	21st to end	Day	36% 9% 16% 18% 20% 2	4397
August	1st to 10th	Day	39% 9% 14% 21% 16% 1	4091
	11th to 20th	Day	38% 9% 14% 28% 10% 1	4083
	21st to end	Day	38% 8% 13% 28% 13% 1	4531
September	1st to 10th	Day	40% 9% 15% 24% 12% 1	2165
	11th to 20th	Day	35% 6% 13% 31% 14% 1	2090
	21st to end	Day	46% 8% 13% 23% 10% 1	2090
October	1st to 10th	Day	33% 5% 11% 34% 14% 2	3330
	11th to 20th	Day	42% 7% 12% 23% 15%	3140
	21st to end	Day	49% 6% 13% 22% 10% 1	3188
November	1st to 10th	Day	50% 7% 12% 21% 10% 1	1762
	11th to 20th	Day	55% 6% 14% 15% 9%	1757
	21st to end	Day	60% 6% 14% 16% 5% 1	1600
December	1st to 10th	Day	65% 7% 13% 11% 4	1600
	11th to 20th	Day	60% 5% 14% 16% 4	1811
	21st to end	Day	76% 6% 9% 7% 3	2516
January	1st to 10th	Night	59% 6% 14% 14% 6% 1	4428
	11th to 20th	Night	70% 8% 8% 11% 3	4440
	21st to end	Night	67% 5% 9% 15% 3	4587
February	1st to 10th	Night	61% 6% 10% 16% 7% 1	2470
	11th to 20th	Night	55% 6% 10% 18% 10% 1	2321
	21st to end	Night	58% 5% 10% 18% 8% 1	1884
March	1st to 10th	Night	48% 4 16% 26% 6% 1	3619
	11th to 20th	Night	40% 6% 15% 24% 14% 1	3480
	21st to end	Night	48% 7% 11% 23% 11% 1	3817
April	1st to 10th	Night	49% 6% 9% 21% 13% 2	2008
	11th to 20th	Night	45% 6% 11% 18% 19% 2	1687
	21st to end	Night	47% 7% 10% 18% 15% 3	1710
May	1st to 10th	Night	44% 7% 10% 21% 13% 5%	2840
	11th to 20th	Night	42% 7% 11% 25% 12% 3	2813
	21st to end	Night	32% 8% 10% 23% 19% 7%	2924
June	1st to 10th	Night	37% 7% 12% 25% 17% 2	1330
	11th to 20th	Night	34% 8% 13% 23% 19% 3	1330
	21st to end	Night	33% 7% 14% 26% 18% 2	1330
July	1st to 10th	Night	32% 6% 14% 26% 15% 7%	2387
	11th to 20th	Night	28% 6% 12% 34% 18% 1	2482
	21st to end	Night	31% 8% 18% 19% 21% 2	2917
August	1st to 10th	Night	35% 6% 14% 28% 16% 1	2814
	11th to 20th	Night	35% 7% 14% 29% 13% 2	2812
	21st to end	Night	33% 8% 13% 32% 14% 1	3124
September	1st to 10th	Night	35% 7% 13% 28% 14% 2	1993
	11th to 20th	Night	28% 7% 13% 33% 18% 1	2090
	21st to end	Night	41% 6% 12% 29% 12% 1	2090
October	1st to 10th	Night	26% 6% 12% 30% 26% 1	3629
	11th to 20th	Night	45% 5% 10% 25% 16% 1	3779
	21st to end	Night	45% 5% 11% 27% 11% 1	4359
November	1st to 10th	Night	42% 6% 13% 26% 12% 1	2536
	11th to 20th	Night	53% 7% 13% 18% 8% 1	2640
	21st to end	Night	57% 6% 15% 16% 5% 1	2800
December	1st to 10th	Night	62% 6% 14% 15% 4	2800
	11th to 20th	Night	58% 8% 13% 14% 7%	3600
	21st to end	Night	73% 6% 10% 7% 4	5220

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	22% 17% 36% 20% 5%	270
	11th to 20th	Day	19% 16% 43% 18% 4 1	270
	21st to end	Day	25% 13% 35% 22% 4 1	297
February	1st to 10th	Day	20% 21% 40% 14% 4 1	270
	11th to 20th	Day	19% 17% 43% 19% 1	270
	21st to end	Day	19% 28% 36% 14% 2	225
March	1st to 10th	Day	24% 16% 39% 16% 5%	332
	11th to 20th	Day	19% 15% 32% 23% 8% 1	460
	21st to end	Day	25% 13% 34% 21% 7% 1	506
April	1st to 10th	Day	16% 18% 36% 21% 8% 1	460
	11th to 20th	Day	24% 15% 29% 17% 10% 5%	452
	21st to end	Day	20% 13% 30% 24% 11% 2	460
May	1st to 10th	Day	17% 13% 32% 24% 12% 3	463
	11th to 20th	Day	17% 8% 30% 25% 15% 6%	487
	21st to end	Day	14% 7% 25% 29% 18% 7%	529
June	1st to 10th	Day	12% 8% 32% 31% 13% 4	680
	11th to 20th	Day	12% 8% 31% 30% 15% 4	680
	21st to end	Day	12% 7% 30% 31% 16% 4	680
July	1st to 10th	Day	8% 5% 23% 34% 22% 9%	671
	11th to 20th	Day	10% 5% 27% 32% 18% 8%	668
	21st to end	Day	7% 4 24% 31% 24% 9%	581
August	1st to 10th	Day	10% 4 20% 30% 23% 13%	486
	11th to 20th	Day	11% 4 18% 32% 22% 13%	479
	21st to end	Day	12% 4 22% 27% 24% 10%	539
September	1st to 10th	Day	12% 6% 25% 26% 21% 11%	490
	11th to 20th	Day	9% 4 18% 26% 28% 15%	490
	21st to end	Day	14% 12% 23% 24% 17% 9%	490
October	1st to 10th	Day	16% 10% 29% 22% 18% 6%	490
	11th to 20th	Day	17% 18% 31% 25% 7% 2	490
	21st to end	Day	21% 20% 33% 19% 6% 1	400
November	1st to 10th	Day	17% 20% 32% 21% 9% 1	300
	11th to 20th	Day	21% 20% 36% 16% 6% 1	277
	21st to end	Day	22% 19% 38% 18% 4	200
December	1st to 10th	Day	24% 16% 37% 16% 7% 1	200
	11th to 20th	Day	27% 20% 37% 15% 2 1	200
	21st to end	Day	24% 20% 36% 17% 3	222
January	1st to 10th	Night	20% 17% 37% 19% 6% 1	950
	11th to 20th	Night	21% 16% 36% 22% 4 1	950
	21st to end	Night	18% 10% 37% 28% 7%	865
February	1st to 10th	Night	22% 14% 40% 21% 3	760
	11th to 20th	Night	21% 16% 33% 25% 6%	743
	21st to end	Night	21% 16% 40% 21% 3	628
March	1st to 10th	Night	19% 12% 35% 28% 7%	760
	11th to 20th	Night	16% 13% 39% 26% 6% 1	760
	21st to end	Night	21% 12% 30% 29% 7%	836
April	1st to 10th	Night	23% 13% 33% 27% 5%	683
	11th to 20th	Night	22% 9% 33% 24% 9% 2	563
	21st to end	Night	20% 7% 32% 32% 8% 1	570
May	1st to 10th	Night	17% 6% 29% 35% 12% 1	570
	11th to 20th	Night	18% 5% 27% 36% 13% 1	561
	21st to end	Night	12% 3 26% 35% 21% 2	536
June	1st to 10th	Night	14% 4 27% 40% 16%	380
	11th to 20th	Night	14% 4 28% 37% 16%	380
	21st to end	Night	9% 5% 24% 43% 18% 1	380
July	1st to 10th	Night	7% 1 17% 45% 27% 3	491
	11th to 20th	Night	10% 2 18% 42% 24% 4	552
	21st to end	Night	7% 2 18% 48% 24% 1	624
August	1st to 10th	Night	8% 2 14% 45% 28% 3	567
	11th to 20th	Night	8% 2 18% 37% 32% 4	564
	21st to end	Night	11% 3 19% 36% 27% 4	627
September	1st to 10th	Night	11% 6% 22% 34% 22% 5%	698
	11th to 20th	Night	11% 4 16% 36% 28% 6%	760
	21st to end	Night	17% 8% 22% 31% 18% 5%	760
October	1st to 10th	Night	17% 6% 29% 26% 20% 1	760
	11th to 20th	Night	21% 13% 31% 26% 8% 1	760
	21st to end	Night	24% 12% 34% 25% 4	836
November	1st to 10th	Night	19% 11% 33% 27% 9% 1	780
	11th to 20th	Night	19% 15% 38% 21% 6% 1	800
	21st to end	Night	24% 16% 36% 21% 5%	800
December	1st to 10th	Night	24% 15% 38% 19% 5%	800
	11th to 20th	Night	23% 14% 40% 20% 3	925
	21st to end	Night	29% 13% 36% 21% 2	1063

Page generated at 2024-12-21 04:13:51. Version ac07

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