Curiosity Observatory
Clear Sky Chart
History

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

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	17% 12% 4 9% 5% 4 4 3 5% 6% 30%	101958
	Night	16% 14% 5% 9% 6% 5% 4 3 4 5% 29%	97800
Transparency	Day	53% 6% 12% 20% 8% 1	105509
	Night	55% 6% 11% 18% 8% 1	102338
Seeing	Day	23% 15% 31% 21% 8% 2	15201
	Night	24% 13% 31% 24% 8% 1	24248

By Month

Percentage Cloud Cover NE (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	15% 23% 8% 14% 5% 4 3 3 4 6% 15%	2208
	11th to 20th	Day	11% 17% 9% 16% 7% 6% 4 3 4 6% 17%	2281
	21st to end	Day	16% 21% 10% 12% 6% 5% 4 3 4 4 14%	3124
February	1st to 10th	Day	9% 20% 7% 13% 9% 6% 5% 3 5% 4 19%	1710
	11th to 20th	Day	11% 19% 6% 12% 8% 4 4 3 4 6% 23%	1663
	21st to end	Day	14% 17% 5% 13% 7% 6% 4 3 4 4 22%	1418
March	1st to 10th	Day	18% 17% 4 8% 4 4 4 3 5% 7% 25%	3397
	11th to 20th	Day	10% 16% 6% 16% 6% 5% 4 4 4 5% 24%	3480
	21st to end	Day	11% 14% 5% 11% 6% 5% 4 3 4 5% 32%	3815
April	1st to 10th	Day	20% 15% 4 9% 4 4 4 4 5% 6% 27%	2256
	11th to 20th	Day	22% 12% 3 8% 4 4 3 3 5% 5% 31%	2402
	21st to end	Day	22% 13% 3 7% 4 4 3 3 4 4 34%	2470
May	1st to 10th	Day	21% 10% 3 7% 4 4 4 3 5% 7% 32%	4256
	11th to 20th	Day	16% 8% 3 7% 5% 5% 4 3 5% 7% 36%	4398
	21st to end	Day	20% 7% 2 6% 4 4 4 3 5% 8% 39%	4837
June	1st to 10th	Day	19% 10% 3 7% 5% 4 4 4 5% 6% 32%	2831
	11th to 20th	Day	15% 7% 2 7% 5% 5% 5% 4 6% 7% 36%	2850
	21st to end	Day	19% 8% 3 7% 5% 5% 5% 5% 7% 7% 30%	2850
July	1st to 10th	Day	17% 8% 2 7% 5% 5% 5% 4 6% 8% 32%	4760
	11th to 20th	Day	15% 6% 3 6% 4 4 5% 4 6% 9% 38%	4760
	21st to end	Day	14% 6% 2 6% 4 4 4 3 5% 7% 46%	4747
August	1st to 10th	Day	13% 7% 3 7% 5% 5% 5% 4 6% 9% 36%	4104
	11th to 20th	Day	20% 7% 2 5% 4 4 4 4 6% 8% 36%	4044
	21st to end	Day	12% 6% 2 7% 5% 4 4 4 5% 8% 42%	4445
September	1st to 10th	Day	19% 8% 3 6% 4 5% 4 4 4 6% 38%	2280
	11th to 20th	Day	18% 8% 2 4 4 5% 5% 3 5% 8% 39%	2176
	21st to end	Day	23% 9% 3 6% 4 3 4 4 5% 6% 33%	2050
October	1st to 10th	Day	19% 11% 3 8% 5% 5% 3 3 5% 6% 32%	1900
	11th to 20th	Day	24% 16% 3 9% 5% 5% 4 3 4 4 23%	1900
	21st to end	Day	28% 17% 4 8% 4 3 4 3 4 5% 19%	2043
November	1st to 10th	Day	20% 16% 5% 8% 4 4 4 3 5% 6% 25%	1569
	11th to 20th	Day	19% 17% 5% 13% 5% 4 4 3 4 5% 20%	1600
	21st to end	Day	25% 22% 5% 11% 5% 4 4 3 4 4 15%	1600
December	1st to 10th	Day	17% 22% 8% 13% 7% 4 4 2 5% 4 14%	1560
	11th to 20th	Day	16% 20% 6% 11% 5% 4 3 4 4 5% 21%	1743
	21st to end	Day	18% 21% 11% 18% 6% 3 2 2 2 3 14%	2431
January	1st to 10th	Night	14% 19% 8% 15% 8% 5% 4 3 5% 4 14%	4748
	11th to 20th	Night	12% 17% 6% 14% 8% 7% 6% 4 4 4 18%	4684
	21st to end	Night	12% 23% 9% 13% 6% 6% 5% 3 4 4 14%	4532
February	1st to 10th	Night	10% 16% 6% 12% 9% 7% 5% 3 5% 5% 21%	2470
	11th to 20th	Night	13% 17% 7% 12% 8% 5% 4 3 4 4 22%	2403
	21st to end	Night	14% 18% 6% 10% 7% 6% 5% 3 5% 5% 22%	2033
March	1st to 10th	Night	13% 16% 4 9% 6% 4 5% 3 4 6% 30%	3443
	11th to 20th	Night	13% 19% 6% 10% 5% 4 4 3 4 6% 26%	3479
	21st to end	Night	13% 11% 6% 9% 6% 5% 4 3 4 5% 34%	3817
April	1st to 10th	Night	21% 15% 4 8% 5% 3 3 3 4 5% 29%	1924
	11th to 20th	Night	20% 11% 4 6% 6% 5% 3 3 4 5% 34%	1744
	21st to end	Night	22% 10% 3 7% 4 4 5% 4 4 7% 32%	1710
May	1st to 10th	Night	17% 11% 3 8% 5% 5% 4 4 5% 5% 34%	2683
	11th to 20th	Night	15% 9% 2 6% 4 5% 5% 4 5% 7% 38%	2495
	21st to end	Night	15% 8% 2 7% 5% 4 4 3 6% 8% 39%	2738
June	1st to 10th	Night	15% 10% 4 6% 6% 5% 4 3 5% 6% 35%	1345
	11th to 20th	Night	17% 7% 3 5% 5% 4 3 2 4 8% 43%	1330
	21st to end	Night	15% 8% 3 7% 5% 5% 5% 4 6% 8% 35%	1330
July	1st to 10th	Night	16% 6% 3 7% 4 4 4 4 6% 7% 40%	2210
	11th to 20th	Night	16% 8% 3 6% 4 3 3 3 5% 7% 41%	2210
	21st to end	Night	12% 6% 2 5% 4 3 4 3 6% 8% 48%	2790
August	1st to 10th	Night	13% 6% 2 6% 5% 5% 5% 4 6% 7% 41%	2825
	11th to 20th	Night	14% 8% 3 8% 4 4 4 3 5% 6% 42%	2785
	21st to end	Night	16% 5% 2 6% 3 3 3 3 5% 7% 46%	3178
September	1st to 10th	Night	17% 6% 2 5% 4 3 4 3 5% 7% 46%	1900
	11th to 20th	Night	16% 8% 2 5% 3 3 3 3 5% 5% 49%	2002
	21st to end	Night	19% 9% 2 5% 4 3 3 3 5% 7% 40%	2129
October	1st to 10th	Night	19% 10% 3 7% 4 4 5% 4 5% 4 35%	2280
	11th to 20th	Night	25% 14% 2 8% 4 4 4 4 4 5% 26%	2280
	21st to end	Night	26% 16% 5% 8% 4 4 4 2 4 5% 23%	2553
November	1st to 10th	Night	21% 11% 3 8% 5% 5% 4 3 4 6% 30%	2727
	11th to 20th	Night	18% 16% 5% 11% 6% 5% 4 3 4 5% 22%	2800
	21st to end	Night	22% 20% 5% 9% 6% 4 3 3 5% 4 17%	2800
December	1st to 10th	Night	18% 23% 7% 11% 7% 4 4 3 4 4 15%	2737
	11th to 20th	Night	17% 21% 6% 12% 6% 4 4 4 5% 5% 18%	3450
	21st to end	Night	19% 21% 9% 15% 6% 4 4 2 3 3 14%	5236

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	71% 6% 12% 9% 2	2209
	11th to 20th	Day	69% 5% 9% 11% 5% 1	2281
	21st to end	Day	72% 6% 7% 10% 4 1	3124
February	1st to 10th	Day	67% 5% 9% 12% 6% 1	1710
	11th to 20th	Day	63% 5% 10% 12% 9% 1	1672
	21st to end	Day	65% 5% 6% 14% 9% 1	1418
March	1st to 10th	Day	58% 8% 11% 14% 9% 1	3400
	11th to 20th	Day	60% 8% 10% 15% 7% 1	3480
	21st to end	Day	54% 6% 9% 18% 11% 2	3815
April	1st to 10th	Day	57% 5% 10% 17% 8% 1	2256
	11th to 20th	Day	54% 5% 7% 22% 10% 1	2402
	21st to end	Day	54% 5% 8% 17% 13% 3	2470
May	1st to 10th	Day	49% 7% 10% 23% 10% 1	4268
	11th to 20th	Day	44% 8% 13% 26% 8% 1	4402
	21st to end	Day	44% 7% 13% 18% 17% 1	4837
June	1st to 10th	Day	51% 7% 11% 20% 10% 1	2831
	11th to 20th	Day	43% 8% 12% 23% 12% 1	2850
	21st to end	Day	50% 9% 12% 18% 9% 1	2850
July	1st to 10th	Day	48% 6% 17% 22% 7%	4686
	11th to 20th	Day	41% 5% 18% 30% 6%	4679
	21st to end	Day	38% 5% 16% 30% 11%	4596
August	1st to 10th	Day	44% 6% 13% 30% 7%	4091
	11th to 20th	Day	46% 6% 15% 25% 8%	4083
	21st to end	Day	39% 6% 12% 33% 9% 1	4445
September	1st to 10th	Day	45% 7% 14% 23% 10% 1	2280
	11th to 20th	Day	43% 7% 13% 27% 9%	2176
	21st to end	Day	52% 7% 12% 22% 7%	2050
October	1st to 10th	Day	51% 5% 12% 25% 7%	3160
	11th to 20th	Day	54% 6% 13% 19% 8%	3140
	21st to end	Day	69% 4 14% 9% 4	3345
November	1st to 10th	Day	60% 6% 13% 15% 6%	1569
	11th to 20th	Day	66% 7% 10% 10% 6% 1	1600
	21st to end	Day	74% 6% 8% 9% 4	1600
December	1st to 10th	Day	72% 6% 9% 9% 3	1560
	11th to 20th	Day	65% 6% 10% 14% 5%	1743
	21st to end	Day	77% 3 5% 12% 2	2431
January	1st to 10th	Night	70% 9% 10% 8% 3	4748
	11th to 20th	Night	66% 8% 10% 12% 4	4684
	21st to end	Night	73% 6% 5% 9% 6% 1	4532
February	1st to 10th	Night	64% 6% 9% 14% 6% 1	2470
	11th to 20th	Night	64% 6% 9% 15% 6% 1	2405
	21st to end	Night	63% 7% 8% 15% 8% 1	2033
March	1st to 10th	Night	53% 7% 10% 16% 12% 1	3453
	11th to 20th	Night	57% 8% 11% 15% 7% 1	3480
	21st to end	Night	51% 7% 8% 19% 12% 3	3817
April	1st to 10th	Night	58% 4 9% 16% 11% 2	1924
	11th to 20th	Night	53% 5% 7% 20% 13% 2	1744
	21st to end	Night	52% 6% 10% 14% 15% 3	1710
May	1st to 10th	Night	49% 7% 10% 21% 12% 1	2690
	11th to 20th	Night	41% 9% 12% 24% 12% 2	2496
	21st to end	Night	42% 7% 12% 21% 15% 3	2739
June	1st to 10th	Night	48% 7% 10% 22% 10% 3	1345
	11th to 20th	Night	41% 6% 11% 23% 17% 1	1330
	21st to end	Night	46% 8% 13% 20% 12% 1	1330
July	1st to 10th	Night	42% 6% 13% 26% 11% 1	2175
	11th to 20th	Night	43% 5% 15% 28% 8% 1	2168
	21st to end	Night	34% 6% 14% 29% 17%	2701
August	1st to 10th	Night	41% 6% 14% 28% 10%	2814
	11th to 20th	Night	43% 6% 16% 27% 8% 1	2812
	21st to end	Night	37% 5% 15% 30% 12% 1	3178
September	1st to 10th	Night	38% 7% 15% 28% 11% 2	1900
	11th to 20th	Night	38% 6% 14% 31% 10% 1	2002
	21st to end	Night	44% 6% 16% 26% 9%	2129
October	1st to 10th	Night	48% 6% 10% 27% 9%	3800
	11th to 20th	Night	53% 4 13% 24% 5%	3779
	21st to end	Night	59% 5% 19% 12% 5%	4201
November	1st to 10th	Night	54% 7% 15% 19% 5%	2727
	11th to 20th	Night	63% 8% 10% 13% 6% 1	2800
	21st to end	Night	69% 7% 10% 11% 3	2800
December	1st to 10th	Night	73% 6% 7% 10% 3	2737
	11th to 20th	Night	66% 8% 8% 13% 5%	3449
	21st to end	Night	77% 4 5% 10% 3	5236

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% 21% 31% 15% 4 1	180
	11th to 20th	Day	17% 16% 43% 15% 7% 1	189
	21st to end	Day	26% 13% 34% 20% 7% 1	297
February	1st to 10th	Day	29% 28% 31% 9% 3	270
	11th to 20th	Day	24% 21% 39% 14% 1	270
	21st to end	Day	33% 25% 34% 8%	225
March	1st to 10th	Day	22% 21% 37% 17% 3	436
	11th to 20th	Day	20% 19% 37% 19% 3 1	460
	21st to end	Day	23% 21% 34% 17% 4 1	506
April	1st to 10th	Day	27% 18% 30% 19% 5% 1	460
	11th to 20th	Day	32% 19% 23% 16% 6% 3	452
	21st to end	Day	31% 19% 28% 15% 5% 1	460
May	1st to 10th	Day	26% 13% 31% 19% 10% 1	463
	11th to 20th	Day	23% 15% 28% 21% 10% 2	487
	21st to end	Day	21% 13% 33% 22% 10% 1	529
June	1st to 10th	Day	21% 14% 36% 21% 7% 1	661
	11th to 20th	Day	16% 16% 33% 25% 8% 2	680
	21st to end	Day	22% 12% 30% 26% 9% 2	680
July	1st to 10th	Day	14% 11% 33% 31% 10% 1	671
	11th to 20th	Day	16% 11% 28% 28% 13% 3	668
	21st to end	Day	16% 9% 27% 33% 12% 4	542
August	1st to 10th	Day	20% 10% 24% 29% 13% 4	486
	11th to 20th	Day	21% 5% 22% 29% 15% 9%	479
	21st to end	Day	20% 9% 28% 23% 15% 4	539
September	1st to 10th	Day	20% 12% 30% 23% 12% 3	490
	11th to 20th	Day	18% 7% 29% 30% 10% 6%	490
	21st to end	Day	27% 9% 24% 24% 12% 3	490
October	1st to 10th	Day	25% 17% 26% 19% 11% 2	490
	11th to 20th	Day	29% 19% 33% 13% 4 1	490
	21st to end	Day	35% 17% 33% 13% 1 1	492
November	1st to 10th	Day	33% 19% 35% 11% 1	201
	11th to 20th	Day	26% 19% 39% 13% 4	200
	21st to end	Day	35% 20% 32% 12% 2 1	200
December	1st to 10th	Day	25% 19% 33% 21% 1 1	190
	11th to 20th	Day	30% 21% 32% 13% 4 1	180
	21st to end	Day	29% 22% 33% 12% 5% 1	198
January	1st to 10th	Night	26% 13% 36% 20% 5%	950
	11th to 20th	Night	27% 15% 31% 22% 4	919
	21st to end	Night	20% 12% 34% 24% 9% 1	836
February	1st to 10th	Night	17% 18% 39% 21% 4	760
	11th to 20th	Night	22% 16% 39% 19% 5%	743
	21st to end	Night	23% 19% 33% 21% 4	628
March	1st to 10th	Night	19% 19% 35% 21% 5%	760
	11th to 20th	Night	22% 18% 35% 19% 6% 1	760
	21st to end	Night	19% 16% 36% 24% 5% 1	836
April	1st to 10th	Night	27% 14% 31% 23% 5%	760
	11th to 20th	Night	25% 17% 29% 20% 8% 1	620
	21st to end	Night	25% 13% 29% 23% 9% 1	570
May	1st to 10th	Night	22% 9% 31% 29% 9% 1	485
	11th to 20th	Night	19% 10% 32% 30% 9% 1	374
	21st to end	Night	19% 9% 33% 32% 6%	411
June	1st to 10th	Night	18% 8% 35% 30% 9%	380
	11th to 20th	Night	21% 7% 28% 32% 11% 1	380
	21st to end	Night	19% 9% 27% 29% 15% 1	380
July	1st to 10th	Night	12% 5% 33% 39% 11% 1	370
	11th to 20th	Night	13% 6% 29% 36% 16%	368
	21st to end	Night	11% 4 29% 39% 16% 1	454
August	1st to 10th	Night	17% 5% 26% 35% 16% 2	567
	11th to 20th	Night	16% 4 23% 33% 22% 2	564
	21st to end	Night	20% 7% 27% 28% 15% 3	655
September	1st to 10th	Night	21% 6% 26% 28% 17% 1	760
	11th to 20th	Night	19% 8% 26% 27% 18% 3	760
	21st to end	Night	25% 7% 24% 28% 14% 2	760
October	1st to 10th	Night	24% 13% 26% 29% 7% 1	760
	11th to 20th	Night	34% 12% 28% 20% 6% 1	760
	21st to end	Night	35% 14% 27% 20% 4	836
November	1st to 10th	Night	28% 13% 32% 21% 5% 1	780
	11th to 20th	Night	27% 17% 31% 18% 6%	800
	21st to end	Night	34% 13% 31% 18% 5%	800
December	1st to 10th	Night	31% 16% 31% 15% 6% 1	783
	11th to 20th	Night	29% 15% 33% 17% 4 1	874
	21st to end	Night	31% 16% 29% 19% 4	1045

Page generated at 2024-12-03 06:45:13. Version ac07

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