Temple
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Temple 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	12% 6% 2 5% 4 4 4 3 5% 7% 48%	137688
	Night	13% 5% 2 5% 3 3 3 3 5% 7% 52%	134712
Transparency	Day	34% 6% 10% 21% 20% 9%	141418
	Night	32% 5% 10% 20% 21% 12%	139036
Seeing	Day	12% 7% 21% 29% 23% 8%	17077
	Night	14% 7% 26% 36% 16% 2	26994

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% 7% 2 5% 3 3 3 3 4 5% 52%	5289
	11th to 20th	Day	11% 5% 2 4 2 2 3 2 5% 6% 57%	5310
	21st to end	Day	24% 8% 3 6% 4 3 2 2 3 4 41%	5907
February	1st to 10th	Day	18% 7% 2 5% 3 3 3 2 4 5% 46%	2100
	11th to 20th	Day	16% 8% 3 6% 3 3 3 2 4 5% 46%	2049
	21st to end	Day	20% 6% 1 5% 3 3 2 2 3 5% 51%	1746
March	1st to 10th	Day	15% 7% 2 6% 4 3 4 3 4 6% 48%	5046
	11th to 20th	Day	13% 6% 2 5% 3 3 3 3 5% 6% 50%	5090
	21st to end	Day	14% 7% 3 5% 4 4 4 3 5% 6% 45%	5583
April	1st to 10th	Day	14% 9% 2 7% 4 4 4 3 5% 7% 41%	2310
	11th to 20th	Day	16% 6% 3 7% 5% 4 4 3 5% 6% 40%	2323
	21st to end	Day	15% 6% 2 6% 4 4 4 3 5% 7% 44%	2660
May	1st to 10th	Day	21% 8% 2 6% 4 3 4 3 6% 7% 36%	7617
	11th to 20th	Day	12% 7% 3 7% 4 4 4 4 5% 7% 41%	7627
	21st to end	Day	12% 7% 2 8% 5% 6% 5% 5% 7% 8% 34%	8392
June	1st to 10th	Day	6% 3 2 5% 4 5% 5% 4 6% 10% 49%	2730
	11th to 20th	Day	7% 3 2 6% 4 4 5% 4 5% 9% 51%	2666
	21st to end	Day	5% 6% 2 6% 4 5% 5% 5% 7% 9% 46%	2600
July	1st to 10th	Day	8% 5% 3 8% 5% 5% 5% 4 6% 9% 42%	5900
	11th to 20th	Day	4 3 2 4 4 4 4 4 7% 9% 54%	5900
	21st to end	Day	6% 5% 2 6% 5% 5% 5% 5% 7% 9% 46%	6422
August	1st to 10th	Day	1 2 2 2 2 3 2 5% 8% 73%	4234
	11th to 20th	Day	3 2 1 3 2 2 3 3 6% 10% 65%	4083
	21st to end	Day	3 2 1 5% 4 5% 5% 4 7% 11% 54%	4063
September	1st to 10th	Day	8% 4 2 5% 6% 4 5% 4 6% 7% 48%	2200
	11th to 20th	Day	10% 5% 2 5% 5% 4 5% 4 5% 6% 48%	2200
	21st to end	Day	6% 4 2 5% 3 5% 4 4 5% 7% 55%	2200
October	1st to 10th	Day	6% 4 1 5% 3 3 3 3 4 6% 63%	2197
	11th to 20th	Day	12% 4 1 4 3 3 2 3 4 5% 59%	2000
	21st to end	Day	12% 4 2 4 3 2 2 2 3 4 61%	2200
November	1st to 10th	Day	13% 7% 2 6% 4 3 3 3 3 5% 52%	2058
	11th to 20th	Day	11% 5% 1 5% 4 3 3 2 4 6% 56%	1998
	21st to end	Day	16% 7% 3 6% 3 3 3 2 4 6% 47%	1890
December	1st to 10th	Day	20% 7% 2 5% 3 3 3 3 4 5% 46%	3030
	11th to 20th	Day	18% 7% 2 6% 3 3 4 3 4 5% 44%	3481
	21st to end	Day	16% 6% 2 4 3 3 3 2 4 4 55%	4587
January	1st to 10th	Night	15% 6% 2 4 2 2 3 2 3 5% 56%	7634
	11th to 20th	Night	9% 3 1 3 2 2 2 2 5% 6% 64%	7680
	21st to end	Night	26% 6% 3 5% 3 3 3 3 4 5% 39%	8364
February	1st to 10th	Night	19% 6% 2 4 3 2 3 3 4 4 50%	2520
	11th to 20th	Night	19% 8% 2 5% 2 2 3 3 3 5% 49%	2458
	21st to end	Night	18% 5% 2 4 3 3 3 2 4 5% 50%	2057
March	1st to 10th	Night	15% 7% 2 6% 4 3 4 3 5% 6% 45%	5029
	11th to 20th	Night	13% 6% 2 5% 3 3 4 3 5% 6% 50%	5090
	21st to end	Night	15% 8% 2 6% 3 3 3 3 3 6% 46%	5588
April	1st to 10th	Night	12% 6% 2 5% 4 3 4 3 5% 7% 49%	2310
	11th to 20th	Night	16% 6% 2 5% 4 4 4 3 6% 5% 45%	2243
	21st to end	Night	16% 7% 1 4 3 3 4 3 4 6% 47%	1954
May	1st to 10th	Night	20% 8% 3 6% 4 4 4 3 5% 7% 37%	5266
	11th to 20th	Night	11% 6% 2 7% 4 4 5% 4 6% 8% 43%	5265
	21st to end	Night	12% 7% 3 7% 4 5% 5% 4 6% 9% 38%	5793
June	1st to 10th	Night	5% 3 1 3 3 3 4 4 5% 11% 57%	1890
	11th to 20th	Night	5% 3 1 3 3 3 3 4 6% 10% 60%	1845
	21st to end	Night	4 4 1 4 4 3 5% 4 6% 9% 56%	1800
July	1st to 10th	Night	8% 5% 2 5% 4 5% 4 5% 7% 9% 45%	4078
	11th to 20th	Night	3 2 1 3 3 3 4 4 7% 11% 61%	4077
	21st to end	Night	6% 4 2 4 4 3 4 4 7% 11% 51%	4449
August	1st to 10th	Night	1 1 1 2 2 2 5% 7% 79%	2926
	11th to 20th	Night	4 2 1 3 3 3 3 4 6% 11% 61%	2970
	21st to end	Night	3 3 1 4 3 3 3 4 7% 11% 58%	3838
September	1st to 10th	Night	7% 4 2 5% 4 4 4 4 6% 7% 52%	2200
	11th to 20th	Night	8% 5% 2 7% 4 4 4 4 5% 8% 50%	2200
	21st to end	Night	6% 3 2 4 3 3 3 3 6% 8% 59%	2200
October	1st to 10th	Night	6% 3 1 3 3 3 2 3 4 6% 68%	2200
	11th to 20th	Night	11% 3 2 3 3 3 3 3 4 5% 61%	2380
	21st to end	Night	13% 4 2 4 2 2 2 2 3 4 61%	2640
November	1st to 10th	Night	13% 5% 2 4 3 3 3 2 4 5% 57%	2460
	11th to 20th	Night	9% 5% 2 5% 3 3 3 3 5% 6% 57%	2619
	21st to end	Night	17% 6% 2 5% 3 3 3 3 5% 4 49%	2730
December	1st to 10th	Night	20% 6% 2 5% 3 3 3 3 4 6% 46%	4380
	11th to 20th	Night	20% 8% 2 5% 3 3 3 2 3 4 47%	4946
	21st to end	Night	17% 6% 2 4 3 2 2 2 3 4 57%	6633

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	35% 4 6% 24% 23% 8%	5290
	11th to 20th	Day	28% 3 5% 18% 31% 15%	5310
	21st to end	Day	49% 3 5% 12% 20% 11%	5907
February	1st to 10th	Day	41% 4 6% 13% 22% 14%	2100
	11th to 20th	Day	42% 4 6% 19% 19% 10%	2059
	21st to end	Day	38% 4 5% 18% 20% 15%	1746
March	1st to 10th	Day	37% 5% 5% 17% 19% 17%	5046
	11th to 20th	Day	35% 5% 8% 10% 16% 27%	5090
	21st to end	Day	37% 6% 9% 20% 20% 7%	5585
April	1st to 10th	Day	42% 6% 9% 16% 15% 12%	2310
	11th to 20th	Day	43% 6% 8% 15% 18% 10%	2323
	21st to end	Day	38% 7% 8% 18% 22% 7%	2660
May	1st to 10th	Day	46% 6% 12% 19% 14% 3	7655
	11th to 20th	Day	40% 7% 9% 16% 24% 4	7631
	21st to end	Day	42% 10% 12% 22% 12% 2	8405
June	1st to 10th	Day	28% 9% 13% 26% 21% 3	2730
	11th to 20th	Day	30% 6% 14% 27% 18% 6%	2666
	21st to end	Day	32% 9% 13% 24% 19% 4	2600
July	1st to 10th	Day	37% 8% 20% 27% 7% 1	5836
	11th to 20th	Day	24% 8% 16% 34% 17% 2	5831
	21st to end	Day	30% 9% 15% 27% 17% 2	6240
August	1st to 10th	Day	10% 4 12% 39% 33% 1	4220
	11th to 20th	Day	16% 5% 22% 39% 16% 2	4122
	21st to end	Day	21% 11% 21% 27% 17% 2	4062
September	1st to 10th	Day	34% 6% 11% 21% 18% 10%	2200
	11th to 20th	Day	34% 8% 12% 21% 20% 6%	2200
	21st to end	Day	28% 6% 9% 22% 21% 15%	2200
October	1st to 10th	Day	14% 3 6% 13% 26% 38%	3574
	11th to 20th	Day	18% 3 6% 17% 35% 21%	3240
	21st to end	Day	23% 4 4 22% 34% 12%	3538
November	1st to 10th	Day	36% 5% 8% 18% 23% 10%	2058
	11th to 20th	Day	31% 4 9% 18% 23% 15%	1998
	21st to end	Day	39% 4 7% 17% 21% 12%	1890
December	1st to 10th	Day	42% 4 7% 16% 22% 10%	3030
	11th to 20th	Day	41% 5% 7% 11% 24% 12%	3479
	21st to end	Day	34% 3 5% 17% 27% 14%	4587
January	1st to 10th	Night	33% 3 6% 20% 27% 12%	7635
	11th to 20th	Night	22% 3 4 18% 33% 20%	7680
	21st to end	Night	48% 4 5% 12% 19% 13%	8364
February	1st to 10th	Night	39% 4 5% 13% 23% 17%	2520
	11th to 20th	Night	40% 4 6% 17% 21% 12%	2458
	21st to end	Night	38% 4 6% 14% 20% 17%	2057
March	1st to 10th	Night	38% 6% 7% 13% 22% 14%	5029
	11th to 20th	Night	34% 6% 9% 12% 16% 24%	5090
	21st to end	Night	39% 6% 8% 17% 22% 9%	5588
April	1st to 10th	Night	35% 6% 11% 18% 16% 15%	2310
	11th to 20th	Night	39% 6% 10% 15% 18% 13%	2243
	21st to end	Night	36% 7% 10% 17% 21% 8%	1954
May	1st to 10th	Night	45% 6% 11% 20% 14% 3	5293
	11th to 20th	Night	37% 8% 11% 17% 20% 7%	5266
	21st to end	Night	40% 8% 15% 24% 9% 4	5805
June	1st to 10th	Night	21% 9% 17% 30% 20% 4	1890
	11th to 20th	Night	19% 6% 17% 32% 20% 7%	1845
	21st to end	Night	24% 8% 15% 28% 22% 4	1800
July	1st to 10th	Night	32% 9% 23% 29% 5% 1	4035
	11th to 20th	Night	17% 7% 23% 36% 16% 1	4026
	21st to end	Night	25% 10% 20% 27% 13% 5%	4320
August	1st to 10th	Night	6% 4 12% 39% 36% 2	2916
	11th to 20th	Night	17% 6% 25% 36% 15% 2	2997
	21st to end	Night	18% 11% 23% 30% 15% 3	3838
September	1st to 10th	Night	29% 8% 14% 23% 17% 10%	2200
	11th to 20th	Night	32% 7% 14% 22% 17% 7%	2200
	21st to end	Night	23% 5% 12% 24% 21% 15%	2200
October	1st to 10th	Night	14% 3 7% 15% 21% 40%	3590
	11th to 20th	Night	16% 3 6% 17% 33% 25%	3866
	21st to end	Night	23% 3 4 20% 32% 17%	4252
November	1st to 10th	Night	32% 4 8% 18% 26% 13%	2460
	11th to 20th	Night	28% 5% 8% 18% 24% 17%	2619
	21st to end	Night	39% 3 7% 16% 20% 14%	2730
December	1st to 10th	Night	41% 3 6% 20% 21% 10%	4380
	11th to 20th	Night	42% 3 5% 10% 24% 16%	4947
	21st to end	Night	34% 3 4 16% 28% 16%	6633

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	19% 12% 35% 24% 9% 1	330
	11th to 20th	Day	17% 15% 32% 25% 10% 1	330
	21st to end	Day	20% 13% 36% 22% 8%	363
February	1st to 10th	Day	23% 14% 30% 25% 8%	330
	11th to 20th	Day	23% 16% 35% 21% 5%	330
	21st to end	Day	25% 12% 41% 19% 3	273
March	1st to 10th	Day	20% 18% 34% 24% 5%	330
	11th to 20th	Day	17% 18% 37% 23% 5% 2	330
	21st to end	Day	17% 10% 38% 25% 9% 1	363
April	1st to 10th	Day	22% 15% 34% 23% 6% 1	330
	11th to 20th	Day	16% 15% 38% 23% 7% 1	361
	21st to end	Day	20% 12% 34% 25% 8% 1	680
May	1st to 10th	Day	18% 9% 33% 31% 7% 1	753
	11th to 20th	Day	15% 9% 27% 30% 15% 3	775
	21st to end	Day	14% 5% 24% 34% 18% 5%	844
June	1st to 10th	Day	6% 3 17% 40% 26% 9%	780
	11th to 20th	Day	7% 1 16% 45% 25% 6%	756
	21st to end	Day	6% 3 11% 35% 34% 12%	730
July	1st to 10th	Day	7% 2 9% 33% 35% 14%	721
	11th to 20th	Day	3 1 5% 34% 46% 12%	718
	21st to end	Day	4 1 5% 31% 44% 15%	794
August	1st to 10th	Day	2 3 26% 52% 16%	726
	11th to 20th	Day	5% 4 27% 47% 17%	666
	21st to end	Day	6% 1 5% 18% 40% 30%	438
September	1st to 10th	Day	7% 1 7% 22% 34% 28%	330
	11th to 20th	Day	5% 2 6% 22% 40% 25%	330
	21st to end	Day	8% 2 7% 26% 36% 21%	330
October	1st to 10th	Day	4 2 11% 28% 43% 13%	330
	11th to 20th	Day	9% 4 19% 31% 27% 9%	330
	21st to end	Day	19% 10% 21% 23% 21% 6%	363
November	1st to 10th	Day	18% 7% 27% 26% 17% 4	330
	11th to 20th	Day	15% 7% 28% 29% 17% 4	330
	21st to end	Day	19% 12% 31% 24% 11% 3	330
December	1st to 10th	Day	19% 8% 29% 26% 13% 5%	330
	11th to 20th	Day	20% 15% 30% 24% 9% 2	330
	21st to end	Day	18% 10% 36% 25% 10% 1	363
January	1st to 10th	Night	18% 10% 33% 30% 8%	1050
	11th to 20th	Night	18% 11% 32% 31% 7%	1050
	21st to end	Night	19% 11% 32% 31% 7%	1143
February	1st to 10th	Night	23% 11% 32% 28% 5%	840
	11th to 20th	Night	23% 11% 36% 25% 4	824
	21st to end	Night	22% 12% 43% 21% 3	673
March	1st to 10th	Night	19% 13% 36% 27% 4	630
	11th to 20th	Night	17% 10% 37% 30% 6%	630
	21st to end	Night	14% 12% 43% 26% 5%	693
April	1st to 10th	Night	13% 12% 41% 30% 3	630
	11th to 20th	Night	18% 12% 37% 28% 5%	623
	21st to end	Night	17% 8% 39% 28% 8%	630
May	1st to 10th	Night	14% 8% 39% 33% 5%	630
	11th to 20th	Night	13% 7% 32% 33% 13% 1	621
	21st to end	Night	11% 4 29% 38% 15% 2	683
June	1st to 10th	Night	6% 3 19% 44% 26% 2	630
	11th to 20th	Night	5% 1 25% 50% 17% 1	615
	21st to end	Night	5% 1 15% 47% 29% 4	600
July	1st to 10th	Night	5% 2 10% 44% 34% 5%	585
	11th to 20th	Night	2 2 6% 54% 34% 2	582
	21st to end	Night	2 1 9% 48% 37% 3	657
August	1st to 10th	Night	1 4 51% 40% 4	597
	11th to 20th	Night	7% 1 5% 44% 37% 5%	594
	21st to end	Night	4 1 4 41% 44% 6%	660
September	1st to 10th	Night	8% 1 9% 40% 38% 5%	600
	11th to 20th	Night	10% 1 5% 40% 40% 4	600
	21st to end	Night	8% 1 10% 39% 38% 5%	600
October	1st to 10th	Night	6% 1 10% 50% 29% 5%	600
	11th to 20th	Night	11% 4 21% 39% 22% 2	780
	21st to end	Night	14% 9% 26% 33% 18% 1	880
November	1st to 10th	Night	14% 5% 22% 40% 18% 1	820
	11th to 20th	Night	12% 7% 26% 39% 15% 1	939
	21st to end	Night	19% 9% 28% 31% 11% 1	1050
December	1st to 10th	Night	17% 7% 33% 33% 9% 1	1050
	11th to 20th	Night	21% 7% 29% 34% 8%	1050
	21st to end	Night	20% 7% 33% 32% 8%	1155

Page generated at 2026-06-13 01:31:45. Version ac07

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