Mesquite Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mesquite Springs clear sky chart from 2005-11-06 to 2024-11-25.

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	1 2 1 2 2 2 2 2 4 6% 76%	105146
	Night	2 2 1 3 2 2 3 3 4 6% 73%	103063
Transparency	Day	10% 4 6% 15% 26% 40%	104894
	Night	12% 4 7% 17% 26% 34%	102905
Seeing	Day	5% 13% 31% 31% 17% 5%	15251
	Night	3 6% 20% 41% 26% 3	24917

By Month

Percentage Cloud Cover SW (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	2 2 1 3 2 3 4 4 5% 9% 65%	2539
	11th to 20th	Day	1 3 1 4 3 3 4 4 7% 10% 60%	2540
	21st to end	Day	6% 5% 2 4 3 3 3 3 5% 9% 58%	3276
February	1st to 10th	Day	2 3 1 3 2 2 2 3 5% 6% 68%	1900
	11th to 20th	Day	2 3 1 3 3 3 3 3 5% 8% 66%	1850
	21st to end	Day	3 3 1 2 3 3 4 3 5% 7% 67%	1570
March	1st to 10th	Day	2 1 4 4 4 4 3 6% 8% 65%	3138
	11th to 20th	Day	3 4 1 4 3 3 3 3 5% 8% 64%	3293
	21st to end	Day	2 3 2 4 3 3 4 4 6% 8% 60%	4098
April	1st to 10th	Day	1 2 1 3 3 2 3 3 4 8% 71%	2280
	11th to 20th	Day	1 2 1 2 2 2 2 3 4 6% 74%	2249
	21st to end	Day	1 2 2 2 2 3 3 4 7% 75%	2303
May	1st to 10th	Day	1 1 1 2 2 2 2 2 3 6% 79%	4110
	11th to 20th	Day	1 1 1 1 2 1 2 2 4 6% 81%	4071
	21st to end	Day	1 1 1 2 2 1 2 2 4 5% 81%	4477
June	1st to 10th	Day	1 1 1 2 2 2 3 3 4 7% 75%	2634
	11th to 20th	Day	1 1 1 1 2 2 4 5% 82%	2660
	21st to end	Day	1 1 1 1 1 1 2 3 4 85%	2660
July	1st to 10th	Day	1 1 1 1 2 2 2 3 87%	4420
	11th to 20th	Day	1 1 1 1 2 2 2 4 5% 81%	4420
	21st to end	Day	1 1 1 1 2 3 3 5% 6% 77%	4576
August	1st to 10th	Day	2 2 1 2 1 1 2 1 3 3 83%	3861
	11th to 20th	Day	1 1 1 1 1 1 2 3 91%	3724
	21st to end	Day	1 1 1 1 1 1 2 3 90%	4180
September	1st to 10th	Day	1 1 1 1 1 1 2 2 3 4 84%	2280
	11th to 20th	Day	1 1 1 1 1 2 2 4 87%	2116
	21st to end	Day	1 1 1 1 1 1 1 2 3 87%	2090
October	1st to 10th	Day	1 1 1 1 1 1 3 5% 85%	3490
	11th to 20th	Day	1 1 1 1 1 2 2 2 3 4 83%	3290
	21st to end	Day	1 2 2 2 2 2 3 4 82%	3177
November	1st to 10th	Day	1 2 1 3 2 2 3 2 4 6% 75%	1764
	11th to 20th	Day	1 1 1 2 1 1 2 2 4 7% 78%	1800
	21st to end	Day	2 2 1 2 2 1 2 3 6% 5% 73%	1746
December	1st to 10th	Day	2 3 1 3 3 3 3 2 6% 7% 68%	1710
	11th to 20th	Day	3 6% 2 5% 4 3 4 4 7% 9% 53%	2060
	21st to end	Day	2 5% 2 5% 3 4 4 4 7% 10% 55%	2794
January	1st to 10th	Night	2 3 2 5% 3 3 3 3 4 7% 66%	4406
	11th to 20th	Night	1 3 1 4 3 4 4 3 5% 8% 64%	4420
	21st to end	Night	6% 7% 1 4 3 3 4 3 5% 8% 57%	4389
February	1st to 10th	Night	3 3 2 4 3 3 3 3 5% 5% 67%	2280
	11th to 20th	Night	2 3 1 3 2 3 3 3 5% 6% 69%	2218
	21st to end	Night	2 4 1 4 2 2 3 3 5% 5% 67%	1884
March	1st to 10th	Night	2 1 3 3 3 4 4 5% 7% 68%	3736
	11th to 20th	Night	3 4 2 5% 3 4 5% 4 6% 8% 58%	3686
	21st to end	Night	2 3 2 4 3 3 4 4 7% 7% 62%	3551
April	1st to 10th	Night	2 2 1 3 2 2 3 3 5% 7% 70%	1900
	11th to 20th	Night	2 2 1 3 3 2 2 3 4 5% 74%	1879
	21st to end	Night	1 2 1 2 3 3 3 3 4 5% 74%	1876
May	1st to 10th	Night	1 1 1 2 2 2 2 2 3 5% 79%	2860
	11th to 20th	Night	1 2 2 2 2 3 3 5% 7% 75%	2834
	21st to end	Night	2 2 1 3 2 2 2 2 4 5% 75%	3110
June	1st to 10th	Night	1 2 1 2 2 2 1 3 4 7% 76%	1540
	11th to 20th	Night	1 1 1 3 2 2 2 1 3 4 80%	1520
	21st to end	Night	1 1 1 1 2 2 3 3 85%	1520
July	1st to 10th	Night	1 1 1 2 2 2 2 88%	2540
	11th to 20th	Night	1 2 1 2 2 2 3 3 4 5% 76%	2540
	21st to end	Night	1 1 1 2 2 3 4 3 5% 5% 73%	2977
August	1st to 10th	Night	1 1 2 2 2 3 2 3 4 80%	3069
	11th to 20th	Night	1 1 1 1 1 1 1 2 2 91%	3126
	21st to end	Night	1 1 1 1 1 1 2 3 90%	3498
September	1st to 10th	Night	1 1 2 2 1 2 2 2 3 83%	1900
	11th to 20th	Night	1 1 1 1 1 2 2 3 4 83%	2062
	21st to end	Night	1 1 1 1 1 2 4 87%	2090
October	1st to 10th	Night	1 1 1 1 1 1 2 2 4 85%	3490
	11th to 20th	Night	1 1 2 1 1 1 1 3 4 85%	3643
	21st to end	Night	1 2 1 2 2 2 2 2 3 4 80%	4382
November	1st to 10th	Night	1 1 1 2 2 2 2 2 3 6% 78%	2535
	11th to 20th	Night	1 2 1 2 2 2 2 2 3 7% 77%	2600
	21st to end	Night	2 2 1 2 2 2 2 2 4 7% 72%	2528
December	1st to 10th	Night	2 3 1 5% 3 3 3 3 4 7% 67%	2470
	11th to 20th	Night	3 7% 1 4 3 3 2 3 6% 9% 58%	3142
	21st to end	Night	3 4 2 5% 4 4 5% 5% 6% 8% 53%	4862

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	13% 7% 13% 34% 27% 6%	2539
	11th to 20th	Day	16% 7% 20% 28% 22% 8%	2540
	21st to end	Day	22% 6% 15% 29% 23% 5%	3276
February	1st to 10th	Day	16% 5% 9% 24% 30% 15%	1900
	11th to 20th	Day	15% 5% 9% 22% 33% 15%	1860
	21st to end	Day	14% 6% 10% 26% 30% 14%	1570
March	1st to 10th	Day	13% 5% 9% 27% 30% 16%	3138
	11th to 20th	Day	16% 7% 10% 27% 26% 14%	3293
	21st to end	Day	14% 8% 10% 27% 29% 12%	4098
April	1st to 10th	Day	12% 5% 9% 22% 31% 22%	2280
	11th to 20th	Day	11% 4 8% 16% 35% 27%	2252
	21st to end	Day	9% 4 6% 19% 38% 23%	2303
May	1st to 10th	Day	7% 3 5% 15% 36% 33%	4110
	11th to 20th	Day	6% 3 5% 12% 35% 40%	4074
	21st to end	Day	7% 3 5% 11% 37% 37%	4477
June	1st to 10th	Day	9% 3 6% 11% 27% 44%	2634
	11th to 20th	Day	5% 2 3 8% 21% 60%	2660
	21st to end	Day	6% 2 2 4 16% 70%	2660
July	1st to 10th	Day	5% 1 2 4 7% 80%	4351
	11th to 20th	Day	7% 2 3 6% 13% 69%	4345
	21st to end	Day	7% 3 4 11% 21% 54%	4432
August	1st to 10th	Day	8% 2 3 4 19% 64%	3847
	11th to 20th	Day	3 1 2 4 12% 78%	3760
	21st to end	Day	4 1 1 4 15% 75%	4179
September	1st to 10th	Day	6% 2 3 7% 18% 65%	2280
	11th to 20th	Day	4 2 4 9% 26% 56%	2116
	21st to end	Day	5% 1 2 8% 32% 53%	2090
October	1st to 10th	Day	5% 2 2 7% 24% 60%	3490
	11th to 20th	Day	5% 2 2 9% 32% 49%	3290
	21st to end	Day	6% 2 3 12% 41% 36%	3177
November	1st to 10th	Day	10% 3 6% 21% 38% 22%	1764
	11th to 20th	Day	8% 3 8% 24% 38% 20%	1800
	21st to end	Day	11% 4 7% 25% 31% 21%	1746
December	1st to 10th	Day	15% 6% 13% 25% 25% 15%	1710
	11th to 20th	Day	25% 8% 11% 22% 25% 9%	2059
	21st to end	Day	23% 8% 15% 26% 21% 6%	2794
January	1st to 10th	Night	16% 6% 10% 33% 29% 6%	4406
	11th to 20th	Night	18% 5% 14% 35% 19% 9%	4420
	21st to end	Night	25% 6% 14% 27% 22% 7%	4389
February	1st to 10th	Night	19% 4 9% 23% 28% 16%	2280
	11th to 20th	Night	14% 5% 9% 23% 30% 19%	2219
	21st to end	Night	17% 4 9% 24% 32% 14%	1884
March	1st to 10th	Night	13% 7% 8% 22% 35% 16%	3736
	11th to 20th	Night	18% 10% 10% 20% 28% 14%	3686
	21st to end	Night	15% 7% 10% 28% 31% 9%	3551
April	1st to 10th	Night	13% 4 8% 22% 33% 19%	1900
	11th to 20th	Night	12% 4 9% 15% 35% 25%	1879
	21st to end	Night	10% 5% 6% 15% 39% 24%	1876
May	1st to 10th	Night	8% 4 4 10% 40% 34%	2860
	11th to 20th	Night	7% 5% 6% 12% 31% 40%	2835
	21st to end	Night	9% 3 7% 12% 30% 40%	3110
June	1st to 10th	Night	9% 3 5% 10% 25% 48%	1540
	11th to 20th	Night	9% 3 3 8% 20% 57%	1520
	21st to end	Night	7% 1 3 4 16% 69%	1520
July	1st to 10th	Night	5% 2 2 3 5% 83%	2500
	11th to 20th	Night	10% 2 3 6% 13% 65%	2492
	21st to end	Night	11% 3 5% 9% 18% 54%	2884
August	1st to 10th	Night	10% 2 3 6% 21% 59%	3060
	11th to 20th	Night	3 2 2 3 10% 79%	3156
	21st to end	Night	4 1 2 4 13% 77%	3498
September	1st to 10th	Night	8% 2 3 6% 15% 66%	1900
	11th to 20th	Night	6% 2 4 9% 23% 56%	2062
	21st to end	Night	4 2 3 8% 27% 57%	2090
October	1st to 10th	Night	5% 2 3 8% 19% 62%	3490
	11th to 20th	Night	5% 2 2 7% 27% 56%	3643
	21st to end	Night	7% 2 3 11% 38% 39%	4382
November	1st to 10th	Night	9% 2 5% 19% 39% 26%	2535
	11th to 20th	Night	9% 4 9% 21% 32% 26%	2600
	21st to end	Night	12% 4 7% 18% 35% 24%	2528
December	1st to 10th	Night	17% 7% 9% 24% 27% 16%	2470
	11th to 20th	Night	22% 8% 12% 24% 25% 8%	3142
	21st to end	Night	24% 7% 14% 28% 21% 7%	4862

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	9% 9% 38% 33% 9% 1	180
	11th to 20th	Day	6% 11% 33% 31% 16% 3	180
	21st to end	Day	8% 13% 24% 31% 22% 1	423
February	1st to 10th	Day	8% 15% 31% 28% 15% 2	460
	11th to 20th	Day	10% 15% 34% 28% 12%	455
	21st to end	Day	8% 18% 37% 29% 8% 1	382
March	1st to 10th	Day	7% 23% 34% 24% 12% 1	460
	11th to 20th	Day	10% 18% 36% 25% 10% 1	460
	21st to end	Day	10% 25% 37% 20% 7% 1	506
April	1st to 10th	Day	8% 19% 31% 26% 12% 3	460
	11th to 20th	Day	8% 24% 31% 27% 8% 2	452
	21st to end	Day	5% 20% 34% 23% 15% 3	460
May	1st to 10th	Day	8% 18% 37% 24% 11% 2	463
	11th to 20th	Day	5% 14% 33% 28% 12% 8%	488
	21st to end	Day	4 14% 31% 29% 19% 4	529
June	1st to 10th	Day	2 13% 28% 30% 22% 5%	490
	11th to 20th	Day	2 15% 32% 31% 15% 5%	490
	21st to end	Day	1 12% 27% 35% 18% 6%	490
July	1st to 10th	Day	2 5% 33% 33% 20% 7%	486
	11th to 20th	Day	1 4 29% 35% 21% 10%	484
	21st to end	Day	2 4 31% 32% 23% 8%	531
August	1st to 10th	Day	3 9% 35% 29% 18% 7%	487
	11th to 20th	Day	1 9% 28% 34% 18% 11%	477
	21st to end	Day	1 6% 30% 32% 21% 9%	539
September	1st to 10th	Day	2 7% 31% 33% 20% 7%	490
	11th to 20th	Day	3 10% 34% 32% 17% 4	490
	21st to end	Day	2 11% 27% 38% 18% 4	490
October	1st to 10th	Day	2 11% 30% 33% 19% 6%	490
	11th to 20th	Day	3 9% 27% 32% 24% 5%	490
	21st to end	Day	3 10% 19% 35% 25% 6%	382
November	1st to 10th	Day	3 8% 21% 38% 27% 4	300
	11th to 20th	Day	3 8% 28% 35% 21% 6%	300
	21st to end	Day	2 8% 28% 34% 23% 4	282
December	1st to 10th	Day	5% 6% 30% 41% 16% 2	270
	11th to 20th	Day	4 11% 24% 39% 17% 4	237
	21st to end	Day	6% 16% 31% 33% 13% 2	198
January	1st to 10th	Night	6% 5% 25% 41% 20% 4	760
	11th to 20th	Night	3 5% 24% 47% 17% 5%	760
	21st to end	Night	7% 7% 23% 41% 20% 2	836
February	1st to 10th	Night	6% 8% 24% 38% 23% 2	760
	11th to 20th	Night	5% 7% 23% 42% 21% 2	744
	21st to end	Night	6% 8% 29% 42% 13% 2	628
March	1st to 10th	Night	4 11% 26% 40% 16% 3	760
	11th to 20th	Night	5% 10% 24% 36% 21% 3	760
	21st to end	Night	6% 10% 30% 39% 14% 2	836
April	1st to 10th	Night	4 10% 25% 39% 19% 2	760
	11th to 20th	Night	5% 11% 27% 35% 20% 2	751
	21st to end	Night	3 9% 27% 35% 23% 2	736
May	1st to 10th	Night	3 10% 26% 44% 14% 2	570
	11th to 20th	Night	4 7% 23% 39% 27% 1	561
	21st to end	Night	3 8% 23% 39% 25% 1	617
June	1st to 10th	Night	2 3 15% 40% 37% 4	400
	11th to 20th	Night	2 7% 15% 41% 33% 2	380
	21st to end	Night	2 2 13% 44% 36% 3	380
July	1st to 10th	Night	8% 53% 35% 4	370
	11th to 20th	Night	2 1 8% 42% 43% 3	368
	21st to end	Night	1 1 13% 45% 38% 2	544
August	1st to 10th	Night	2 1 15% 47% 32% 2	698
	11th to 20th	Night	1 1 13% 41% 41% 3	752
	21st to end	Night	2 1 11% 40% 41% 5%	836
September	1st to 10th	Night	1 2 12% 41% 39% 5%	760
	11th to 20th	Night	1 3 15% 42% 35% 4	760
	21st to end	Night	1 3 16% 36% 39% 4	760
October	1st to 10th	Night	1 5% 19% 42% 26% 6%	760
	11th to 20th	Night	3 4 16% 40% 32% 6%	760
	21st to end	Night	2 7% 17% 36% 30% 8%	836
November	1st to 10th	Night	2 6% 16% 39% 31% 6%	780
	11th to 20th	Night	3 5% 18% 43% 27% 4	800
	21st to end	Night	3 5% 22% 38% 29% 2	778
December	1st to 10th	Night	4 4 22% 45% 23% 2	760
	11th to 20th	Night	7% 5% 22% 45% 19% 2	760
	21st to end	Night	5% 8% 25% 44% 16% 1	836

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