Carmangay Village
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carmangay Village clear sky chart from 2005-11-06 to 2024-12-09.

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	8% 8% 3 7% 5% 5% 5% 4 6% 8% 42%	105817
	Night	7% 8% 3 8% 5% 5% 5% 4 6% 8% 40%	102547
Transparency	Day	38% 7% 14% 26% 12% 3	105562
	Night	39% 7% 15% 24% 13% 2	102448
Seeing	Day	12% 10% 26% 28% 18% 6%	15483
	Night	11% 9% 32% 32% 15% 2	24668

By Month

Percentage Cloud Cover NW (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	4 12% 5% 10% 6% 5% 5% 4 8% 10% 32%	2219
	11th to 20th	Day	4 7% 4 13% 8% 6% 6% 6% 6% 7% 33%	2245
	21st to end	Day	4 7% 3 11% 6% 5% 5% 4 6% 10% 40%	2794
February	1st to 10th	Day	6% 14% 5% 9% 8% 7% 6% 4 6% 8% 27%	1575
	11th to 20th	Day	6% 13% 5% 10% 7% 4 6% 5% 6% 8% 30%	1665
	21st to end	Day	4 14% 5% 12% 8% 5% 5% 4 6% 7% 30%	1508
March	1st to 10th	Day	3 11% 4 11% 7% 7% 6% 4 6% 8% 34%	3159
	11th to 20th	Day	6% 9% 3 7% 5% 4 4 4 5% 8% 46%	3489
	21st to end	Day	10% 18% 6% 13% 5% 5% 4 4 5% 6% 25%	3825
April	1st to 10th	Day	9% 14% 4 9% 5% 5% 5% 4 5% 7% 31%	2335
	11th to 20th	Day	10% 13% 4 8% 5% 5% 5% 5% 6% 8% 33%	2440
	21st to end	Day	11% 10% 3 8% 5% 5% 6% 4 7% 8% 34%	2470
May	1st to 10th	Day	18% 13% 4 7% 4 4 4 3 5% 6% 31%	4209
	11th to 20th	Day	10% 7% 3 8% 5% 6% 6% 5% 8% 10% 33%	4694
	21st to end	Day	14% 9% 3 9% 6% 7% 6% 5% 6% 7% 28%	5161
June	1st to 10th	Day	13% 8% 2 6% 4 6% 5% 5% 6% 9% 35%	2850
	11th to 20th	Day	16% 7% 2 7% 6% 5% 5% 5% 7% 8% 32%	2850
	21st to end	Day	8% 4 2 5% 4 4 5% 4 8% 9% 48%	2850
July	1st to 10th	Day	6% 4 2 5% 3 3 4 4 6% 8% 55%	4740
	11th to 20th	Day	4 3 1 4 3 3 4 4 7% 9% 58%	4740
	21st to end	Day	3 2 1 3 2 3 3 3 5% 8% 67%	5018
August	1st to 10th	Day	8% 5% 2 5% 3 4 5% 4 7% 11% 46%	4341
	11th to 20th	Day	5% 4 2 5% 4 4 5% 4 6% 9% 51%	4028
	21st to end	Day	8% 3 1 4 3 3 4 3 6% 8% 57%	4521
September	1st to 10th	Day	10% 4 2 4 3 3 3 4 5% 6% 55%	2349
	11th to 20th	Day	13% 6% 3 5% 3 3 4 3 6% 8% 47%	2090
	21st to end	Day	9% 7% 2 6% 3 4 4 3 5% 7% 50%	2090
October	1st to 10th	Day	8% 8% 3 6% 5% 5% 4 4 8% 8% 43%	3308
	11th to 20th	Day	6% 7% 2 6% 4 4 5% 4 5% 10% 48%	3004
	21st to end	Day	7% 7% 2 6% 4 4 5% 4 7% 8% 46%	3101
November	1st to 10th	Day	10% 13% 4 8% 6% 4 4 4 7% 6% 33%	1629
	11th to 20th	Day	6% 11% 3 8% 5% 5% 5% 3 7% 9% 40%	1600
	21st to end	Day	5% 11% 4 11% 5% 6% 4 4 7% 8% 37%	1410
December	1st to 10th	Day	4 12% 5% 9% 6% 6% 4 3 6% 8% 36%	1386
	11th to 20th	Day	4 9% 5% 13% 7% 6% 6% 5% 6% 8% 31%	1682
	21st to end	Day	4 9% 3 7% 5% 5% 5% 5% 7% 8% 44%	2442
January	1st to 10th	Night	4 12% 5% 11% 6% 6% 6% 5% 7% 9% 30%	4726
	11th to 20th	Night	4 9% 6% 13% 5% 5% 6% 5% 6% 7% 34%	4671
	21st to end	Night	4 9% 4 9% 6% 6% 6% 4 6% 7% 40%	4862
February	1st to 10th	Night	6% 12% 4 12% 6% 6% 5% 5% 6% 8% 31%	2604
	11th to 20th	Night	6% 12% 5% 10% 7% 6% 6% 5% 6% 7% 29%	2402
	21st to end	Night	4 12% 5% 10% 7% 6% 5% 5% 6% 6% 34%	1943
March	1st to 10th	Night	3 9% 5% 12% 8% 6% 5% 5% 7% 8% 32%	3715
	11th to 20th	Night	6% 8% 3 6% 4 4 5% 4 7% 8% 45%	3490
	21st to end	Night	11% 20% 5% 11% 5% 5% 5% 4 6% 7% 22%	3828
April	1st to 10th	Night	8% 12% 4 8% 6% 5% 4 5% 6% 9% 32%	1843
	11th to 20th	Night	10% 11% 3 10% 5% 5% 6% 4 6% 6% 33%	1691
	21st to end	Night	11% 9% 3 8% 7% 5% 5% 4 6% 7% 35%	1710
May	1st to 10th	Night	17% 14% 3 9% 5% 4 5% 3 5% 5% 29%	2756
	11th to 20th	Night	8% 7% 2 8% 5% 5% 5% 6% 8% 10% 37%	2199
	21st to end	Night	14% 8% 3 9% 6% 7% 7% 5% 7% 7% 27%	2414
June	1st to 10th	Night	15% 8% 3 6% 5% 4 4 4 5% 8% 38%	1330
	11th to 20th	Night	16% 7% 2 5% 5% 5% 6% 5% 7% 9% 33%	1330
	21st to end	Night	7% 4 1 6% 5% 4 4 4 6% 9% 48%	1330
July	1st to 10th	Night	5% 3 1 6% 4 5% 5% 5% 6% 9% 51%	2220
	11th to 20th	Night	5% 3 1 4 4 4 5% 4 7% 10% 52%	2220
	21st to end	Night	3 3 2 4 3 3 4 3 5% 7% 63%	2530
August	1st to 10th	Night	7% 4 2 6% 4 5% 5% 4 5% 9% 50%	2589
	11th to 20th	Night	5% 4 2 7% 4 5% 6% 5% 8% 11% 44%	2811
	21st to end	Night	6% 3 1 4 3 3 4 3 6% 8% 60%	3146
September	1st to 10th	Night	9% 4 1 5% 3 4 4 3 7% 8% 51%	1828
	11th to 20th	Night	11% 6% 2 5% 3 3 4 3 5% 7% 52%	2090
	21st to end	Night	9% 6% 2 5% 4 4 5% 3 6% 8% 48%	2090
October	1st to 10th	Night	6% 4 2 5% 3 4 4 3 5% 8% 54%	3666
	11th to 20th	Night	6% 7% 2 6% 5% 4 4 4 5% 7% 50%	3921
	21st to end	Night	5% 5% 3 6% 5% 5% 5% 4 5% 8% 47%	4457
November	1st to 10th	Night	9% 12% 3 7% 5% 5% 5% 4 6% 8% 35%	2649
	11th to 20th	Night	5% 10% 3 7% 5% 4 5% 5% 6% 8% 41%	2800
	21st to end	Night	4 12% 3 8% 5% 4 4 4 6% 10% 39%	2985
December	1st to 10th	Night	5% 11% 3 9% 6% 5% 6% 4 6% 7% 36%	2977
	11th to 20th	Night	3 8% 5% 10% 7% 5% 6% 5% 7% 9% 36%	3510
	21st to end	Night	4 9% 3 8% 5% 5% 5% 4 6% 8% 44%	5214

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	43% 8% 16% 23% 8% 2	2219
	11th to 20th	Day	47% 8% 11% 15% 16% 3	2266
	21st to end	Day	38% 9% 16% 29% 7% 1	2794
February	1st to 10th	Day	53% 8% 12% 17% 8% 2	1575
	11th to 20th	Day	48% 8% 16% 18% 8% 2	1674
	21st to end	Day	51% 6% 11% 18% 12% 1	1508
March	1st to 10th	Day	43% 7% 17% 20% 12% 1	3159
	11th to 20th	Day	35% 6% 22% 25% 12% 1	3490
	21st to end	Day	58% 7% 13% 18% 4	3825
April	1st to 10th	Day	50% 8% 13% 21% 7% 1	2335
	11th to 20th	Day	47% 8% 13% 21% 10% 2	2440
	21st to end	Day	45% 7% 13% 22% 11% 1	2470
May	1st to 10th	Day	53% 6% 10% 25% 6%	4209
	11th to 20th	Day	41% 9% 15% 25% 10%	4698
	21st to end	Day	50% 8% 16% 18% 8% 1	5162
June	1st to 10th	Day	44% 8% 16% 21% 10% 2	2850
	11th to 20th	Day	47% 10% 13% 19% 10% 2	2850
	21st to end	Day	31% 8% 18% 29% 12% 3	2850
July	1st to 10th	Day	26% 6% 13% 30% 20% 5%	4666
	11th to 20th	Day	20% 6% 17% 35% 19% 4	4659
	21st to end	Day	15% 5% 9% 29% 26% 16%	4859
August	1st to 10th	Day	30% 7% 13% 34% 14% 2	4324
	11th to 20th	Day	28% 6% 19% 35% 10% 2	4067
	21st to end	Day	25% 5% 12% 39% 16% 2	4520
September	1st to 10th	Day	28% 6% 13% 26% 17% 9%	2349
	11th to 20th	Day	35% 7% 13% 28% 14% 3	2090
	21st to end	Day	33% 6% 13% 32% 14% 3	2090
October	1st to 10th	Day	36% 6% 12% 33% 13% 1	3308
	11th to 20th	Day	32% 5% 20% 26% 16% 2	3004
	21st to end	Day	34% 6% 12% 32% 11% 3	3101
November	1st to 10th	Day	48% 8% 12% 21% 9% 1	1629
	11th to 20th	Day	41% 6% 19% 24% 9% 1	1600
	21st to end	Day	43% 6% 18% 21% 10% 2	1410
December	1st to 10th	Day	46% 8% 15% 18% 10% 3	1386
	11th to 20th	Day	48% 8% 16% 22% 5% 1	1684
	21st to end	Day	36% 8% 13% 22% 20% 1	2442
January	1st to 10th	Night	48% 8% 15% 21% 6% 2	4726
	11th to 20th	Night	49% 6% 13% 15% 15% 2	4712
	21st to end	Night	39% 9% 16% 25% 10% 1	4862
February	1st to 10th	Night	50% 8% 13% 16% 12% 2	2604
	11th to 20th	Night	51% 8% 12% 19% 10% 1	2403
	21st to end	Night	49% 6% 14% 19% 10% 2	1943
March	1st to 10th	Night	45% 8% 14% 23% 9% 1	3715
	11th to 20th	Night	33% 9% 22% 23% 12% 1	3490
	21st to end	Night	60% 8% 13% 15% 4	3828
April	1st to 10th	Night	46% 9% 12% 21% 11% 1	1843
	11th to 20th	Night	48% 7% 13% 21% 9% 1	1691
	21st to end	Night	45% 8% 12% 23% 9% 2	1710
May	1st to 10th	Night	54% 8% 10% 21% 6%	2756
	11th to 20th	Night	36% 11% 13% 30% 8% 1	2199
	21st to end	Night	49% 10% 16% 18% 6% 1	2414
June	1st to 10th	Night	43% 8% 14% 24% 11% 1	1330
	11th to 20th	Night	44% 8% 15% 21% 10% 2	1330
	21st to end	Night	30% 8% 18% 26% 16% 2	1330
July	1st to 10th	Night	27% 8% 18% 23% 20% 4	2185
	11th to 20th	Night	24% 8% 15% 30% 17% 5%	2178
	21st to end	Night	20% 4 8% 29% 23% 14%	2450
August	1st to 10th	Night	30% 7% 14% 28% 17% 3	2581
	11th to 20th	Night	32% 6% 19% 27% 13% 3	2838
	21st to end	Night	22% 5% 13% 38% 18% 4	3146
September	1st to 10th	Night	30% 7% 12% 26% 18% 7%	1828
	11th to 20th	Night	31% 6% 14% 26% 17% 5%	2090
	21st to end	Night	31% 6% 15% 28% 15% 4	2090
October	1st to 10th	Night	28% 5% 11% 32% 21% 3	3666
	11th to 20th	Night	32% 5% 16% 26% 18% 3	3921
	21st to end	Night	35% 6% 12% 32% 15%	4457
November	1st to 10th	Night	46% 8% 12% 22% 10% 1	2649
	11th to 20th	Night	38% 9% 17% 21% 15% 1	2800
	21st to end	Night	40% 7% 20% 19% 10% 3	2985
December	1st to 10th	Night	45% 8% 14% 19% 10% 3	2977
	11th to 20th	Night	42% 10% 21% 20% 6% 1	3507
	21st to end	Night	37% 7% 14% 24% 14% 4	5214

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	5% 13% 32% 28% 12% 9%	180
	11th to 20th	Day	10% 11% 30% 28% 16% 6%	180
	21st to end	Day	6% 14% 34% 29% 14% 3	198
February	1st to 10th	Day	15% 14% 32% 27% 9% 3	207
	11th to 20th	Day	9% 15% 31% 29% 13% 4	270
	21st to end	Day	13% 13% 29% 28% 16% 3	320
March	1st to 10th	Day	10% 18% 34% 23% 10% 4	460
	11th to 20th	Day	8% 12% 29% 29% 17% 4	460
	21st to end	Day	12% 14% 33% 24% 14% 4	506
April	1st to 10th	Day	14% 17% 31% 27% 10% 2	460
	11th to 20th	Day	14% 12% 25% 27% 17% 4	452
	21st to end	Day	17% 11% 28% 27% 14% 3	460
May	1st to 10th	Day	15% 8% 24% 26% 19% 8%	506
	11th to 20th	Day	16% 6% 23% 25% 24% 6%	675
	21st to end	Day	17% 7% 18% 29% 20% 8%	734
June	1st to 10th	Day	14% 10% 25% 29% 17% 4	680
	11th to 20th	Day	17% 12% 24% 28% 17% 2	680
	21st to end	Day	10% 4 23% 33% 23% 7%	680
July	1st to 10th	Day	8% 4 17% 35% 27% 9%	671
	11th to 20th	Day	6% 5% 23% 32% 26% 8%	668
	21st to end	Day	5% 4 21% 37% 25% 8%	668
August	1st to 10th	Day	9% 5% 18% 34% 25% 9%	487
	11th to 20th	Day	7% 4 20% 30% 27% 12%	477
	21st to end	Day	9% 6% 25% 28% 22% 10%	539
September	1st to 10th	Day	10% 8% 28% 25% 21% 7%	490
	11th to 20th	Day	15% 9% 23% 26% 19% 7%	490
	21st to end	Day	15% 15% 27% 26% 14% 4	490
October	1st to 10th	Day	15% 11% 20% 25% 24% 5%	386
	11th to 20th	Day	11% 14% 32% 21% 15% 7%	300
	21st to end	Day	15% 18% 27% 23% 14% 3	330
November	1st to 10th	Day	20% 13% 30% 24% 10% 4	300
	11th to 20th	Day	12% 15% 37% 27% 7% 2	300
	21st to end	Day	6% 16% 33% 24% 13% 8%	205
December	1st to 10th	Day	9% 14% 34% 25% 14% 5%	196
	11th to 20th	Day	11% 16% 38% 20% 13% 2	180
	21st to end	Day	9% 11% 26% 31% 17% 7%	198
January	1st to 10th	Night	9% 17% 35% 25% 12% 2	950
	11th to 20th	Night	9% 12% 35% 31% 10% 2	935
	21st to end	Night	9% 13% 37% 28% 11% 2	836
February	1st to 10th	Night	11% 13% 29% 29% 15% 4	760
	11th to 20th	Night	10% 10% 32% 34% 13% 2	744
	21st to end	Night	9% 8% 30% 29% 22% 2	628
March	1st to 10th	Night	8% 11% 36% 30% 13% 2	760
	11th to 20th	Night	10% 11% 36% 31% 10% 2	760
	21st to end	Night	12% 10% 31% 31% 14% 2	836
April	1st to 10th	Night	13% 10% 36% 27% 12% 1	689
	11th to 20th	Night	15% 9% 32% 32% 11% 1	563
	21st to end	Night	14% 9% 29% 35% 12% 1	570
May	1st to 10th	Night	14% 8% 27% 33% 18% 1	561
	11th to 20th	Night	13% 5% 26% 33% 21% 2	374
	21st to end	Night	17% 9% 22% 29% 22% 1	411
June	1st to 10th	Night	17% 6% 28% 32% 15% 1	380
	11th to 20th	Night	20% 6% 28% 32% 13%	380
	21st to end	Night	8% 3 30% 37% 21% 1	380
July	1st to 10th	Night	9% 4 18% 43% 26% 1	370
	11th to 20th	Night	8% 3 23% 42% 22% 1	368
	21st to end	Night	4 3 24% 43% 25% 2	416
August	1st to 10th	Night	8% 2 19% 41% 27% 2	412
	11th to 20th	Night	7% 3 20% 46% 23% 2	564
	21st to end	Night	8% 4 24% 42% 20% 2	627
September	1st to 10th	Night	11% 4 25% 37% 22% 1	636
	11th to 20th	Night	15% 3 24% 33% 23% 2	760
	21st to end	Night	11% 7% 33% 33% 13% 3	760
October	1st to 10th	Night	13% 7% 27% 33% 18% 2	760
	11th to 20th	Night	13% 8% 34% 29% 14% 2	760
	21st to end	Night	11% 11% 35% 29% 12% 1	836
November	1st to 10th	Night	16% 11% 42% 22% 8% 1	894
	11th to 20th	Night	11% 16% 41% 23% 6% 2	1000
	21st to end	Night	9% 13% 38% 28% 10% 2	1000
December	1st to 10th	Night	11% 10% 32% 31% 14% 2	993
	11th to 20th	Night	9% 11% 37% 32% 9% 2	950
	21st to end	Night	13% 12% 33% 29% 11% 2	1045

Page generated at 2024-12-06 01:54:50. Version ac07

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