Santa Fe
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Santa Fe clear sky chart from 2005-11-06 to 2024-03-18.

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	4 5% 2 4 4 3 4 5% 6% 8% 57%	78870
	Night	4 5% 2 4 4 2 4 4 5% 7% 59%	80981
Transparency	Day	24% 7% 11% 21% 25% 13%	78590
	Night	24% 6% 11% 21% 26% 12%	80782
Seeing	Day	6% 14% 30% 30% 17% 3	14213
	Night	6% 7% 33% 37% 16% 1	24498

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 6% 4 4 3 2 4 5% 5% 8% 58%	2759
	11th to 20th	Day	3 6% 3 4 3 2 3 3 4 5% 64%	2860
	21st to end	Day	4 7% 2 5% 4 3 4 5% 5% 7% 52%	3146
February	1st to 10th	Day	2 8% 4 5% 4 2 3 2 4 7% 58%	1742
	11th to 20th	Day	4 6% 3 5% 4 2 3 4 5% 8% 56%	1849
	21st to end	Day	4 10% 2 3 3 2 3 4 4 7% 58%	1570
March	1st to 10th	Day	4 6% 3 4 5% 2 4 5% 5% 8% 54%	1979
	11th to 20th	Day	4 9% 3 5% 4 2 3 3 3 7% 55%	2058
	21st to end	Day	4 6% 2 4 4 2 5% 5% 5% 8% 55%	2258
April	1st to 10th	Day	4 4 2 3 3 3 4 4 6% 7% 61%	2160
	11th to 20th	Day	3 6% 3 4 4 3 4 4 4 5% 59%	2131
	21st to end	Day	4 5% 2 3 3 2 3 4 6% 8% 60%	2160
May	1st to 10th	Day	4 3 2 3 3 2 5% 4 5% 8% 62%	2160
	11th to 20th	Day	4 5% 2 5% 4 2 4 6% 6% 7% 55%	2233
	21st to end	Day	3 2 1 3 3 2 4 4 5% 7% 63%	2724
June	1st to 10th	Day	2 2 1 3 3 2 4 6% 7% 9% 62%	2520
	11th to 20th	Day	2 2 1 2 3 2 3 4 5% 6% 70%	2520
	21st to end	Day	5% 3 2 3 3 3 5% 5% 6% 8% 56%	2520
July	1st to 10th	Day	4 4 2 4 5% 4 7% 8% 8% 10% 44%	2520
	11th to 20th	Day	3 3 2 5% 5% 4 8% 7% 10% 12% 42%	2344
	21st to end	Day	5% 4 2 6% 6% 5% 8% 10% 11% 10% 34%	2545
August	1st to 10th	Day	4 4 2 4 6% 4 7% 6% 9% 10% 43%	2262
	11th to 20th	Day	4 4 1 4 5% 4 6% 8% 8% 10% 45%	2123
	21st to end	Day	4 4 1 4 5% 4 6% 7% 8% 9% 46%	2376
September	1st to 10th	Day	7% 5% 2 4 5% 4 6% 5% 7% 8% 49%	2160
	11th to 20th	Day	6% 4 2 3 4 2 4 5% 6% 7% 58%	2160
	21st to end	Day	3 2 1 3 4 2 3 3 5% 7% 67%	1966
October	1st to 10th	Day	8% 4 2 4 5% 2 3 4 4 6% 58%	1800
	11th to 20th	Day	4 2 1 2 2 2 2 2 3 5% 76%	1800
	21st to end	Day	5% 4 2 3 2 2 2 3 3 4 71%	1980
November	1st to 10th	Day	2 3 2 3 2 2 2 3 3 8% 70%	1782
	11th to 20th	Day	4 2 1 3 2 1 3 5% 4 6% 69%	1710
	21st to end	Day	5% 5% 3 4 2 2 3 3 3 7% 63%	1710
December	1st to 10th	Day	4 6% 2 3 3 2 3 3 4 7% 63%	1563
	11th to 20th	Day	5% 5% 2 5% 4 3 4 4 4 8% 55%	1926
	21st to end	Day	5% 6% 2 3 3 2 2 3 3 7% 64%	2794
January	1st to 10th	Night	2 7% 4 7% 5% 3 3 4 4 6% 54%	4225
	11th to 20th	Night	3 5% 2 4 3 2 4 4 4 6% 62%	4110
	21st to end	Night	4 8% 3 5% 4 2 4 4 5% 7% 53%	4521
February	1st to 10th	Night	3 8% 3 5% 3 1 3 2 3 6% 62%	2437
	11th to 20th	Night	6% 7% 3 5% 3 2 3 3 4 7% 57%	2218
	21st to end	Night	5% 8% 2 4 3 1 2 3 3 5% 63%	1884
March	1st to 10th	Night	5% 7% 2 4 4 2 3 4 5% 6% 58%	2198
	11th to 20th	Night	5% 8% 3 5% 3 3 3 3 5% 5% 56%	2068
	21st to end	Night	5% 7% 3 4 3 2 3 4 4 5% 60%	2098
April	1st to 10th	Night	5% 4 2 4 2 2 3 4 5% 7% 63%	1800
	11th to 20th	Night	5% 7% 3 3 4 2 3 4 5% 6% 59%	1777
	21st to end	Night	5% 5% 1 3 4 2 4 4 5% 5% 63%	1800
May	1st to 10th	Night	5% 4 2 3 3 3 4 4 4 6% 64%	1800
	11th to 20th	Night	6% 5% 2 4 4 3 5% 4 6% 7% 52%	1656
	21st to end	Night	3 3 2 3 3 2 4 3 4 6% 66%	1552
June	1st to 10th	Night	2 2 1 3 5% 3 5% 6% 5% 9% 59%	1440
	11th to 20th	Night	2 3 1 3 3 2 3 4 5% 7% 67%	1440
	21st to end	Night	4 4 2 4 4 2 6% 5% 7% 9% 54%	1440
July	1st to 10th	Night	4 3 2 4 6% 5% 7% 6% 9% 10% 45%	1440
	11th to 20th	Night	3 4 2 6% 6% 4 5% 7% 9% 12% 43%	1611
	21st to end	Night	5% 4 2 5% 5% 4 7% 8% 11% 14% 34%	1773
August	1st to 10th	Night	3 3 2 4 5% 4 9% 6% 10% 11% 43%	1675
	11th to 20th	Night	5% 4 2 6% 6% 4 7% 8% 9% 11% 39%	1778
	21st to end	Night	3 3 1 4 4 4 6% 8% 9% 11% 48%	1980
September	1st to 10th	Night	5% 3 1 4 5% 3 5% 6% 8% 9% 51%	1800
	11th to 20th	Night	5% 4 1 4 3 2 5% 4 7% 8% 57%	1800
	21st to end	Night	5% 3 2 3 3 2 3 4 4 6% 65%	1991
October	1st to 10th	Night	7% 5% 2 3 4 3 4 3 4 6% 61%	2160
	11th to 20th	Night	3 2 1 2 2 2 2 2 3 4 76%	2160
	21st to end	Night	4 2 1 3 3 2 2 3 5% 5% 69%	2376
November	1st to 10th	Night	3 3 1 2 2 1 3 3 3 6% 74%	2277
	11th to 20th	Night	3 2 1 3 2 2 2 3 3 6% 73%	2470
	21st to end	Night	6% 6% 2 3 3 2 3 2 4 6% 62%	2470
December	1st to 10th	Night	6% 7% 2 3 3 2 3 3 4 6% 62%	2612
	11th to 20th	Night	5% 5% 2 4 4 2 4 4 5% 8% 56%	3271
	21st to end	Night	4 9% 2 4 4 2 3 2 4 5% 62%	4873

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	23% 5% 10% 30% 28% 5%	2760
	11th to 20th	Day	18% 5% 14% 35% 23% 5%	2860
	21st to end	Day	27% 8% 10% 22% 26% 6%	3146
February	1st to 10th	Day	26% 5% 13% 21% 25% 10%	1742
	11th to 20th	Day	25% 5% 9% 24% 24% 13%	1859
	21st to end	Day	25% 3 7% 17% 32% 15%	1570
March	1st to 10th	Day	25% 3 10% 21% 26% 14%	1979
	11th to 20th	Day	29% 5% 8% 19% 29% 10%	2058
	21st to end	Day	24% 6% 11% 21% 28% 10%	2258
April	1st to 10th	Day	22% 4 8% 22% 28% 16%	2160
	11th to 20th	Day	26% 5% 7% 17% 29% 15%	2134
	21st to end	Day	22% 5% 9% 23% 29% 12%	2160
May	1st to 10th	Day	22% 5% 9% 18% 31% 16%	2160
	11th to 20th	Day	27% 7% 10% 20% 24% 11%	2236
	21st to end	Day	19% 5% 11% 18% 24% 22%	2724
June	1st to 10th	Day	16% 7% 13% 20% 24% 19%	2520
	11th to 20th	Day	15% 5% 7% 15% 23% 35%	2520
	21st to end	Day	24% 7% 11% 19% 22% 18%	2520
July	1st to 10th	Day	32% 11% 15% 13% 16% 12%	2451
	11th to 20th	Day	27% 12% 20% 22% 12% 7%	2274
	21st to end	Day	36% 16% 22% 19% 6% 1	2404
August	1st to 10th	Day	31% 13% 19% 18% 12% 8%	2247
	11th to 20th	Day	29% 11% 18% 20% 16% 6%	2123
	21st to end	Day	30% 12% 14% 23% 18% 3	2376
September	1st to 10th	Day	30% 9% 14% 20% 19% 9%	2160
	11th to 20th	Day	24% 8% 11% 18% 24% 15%	2160
	21st to end	Day	17% 5% 8% 23% 33% 14%	1966
October	1st to 10th	Day	27% 6% 8% 19% 25% 15%	1800
	11th to 20th	Day	14% 3 5% 15% 38% 26%	1800
	21st to end	Day	18% 4 7% 21% 36% 14%	1980
November	1st to 10th	Day	15% 3 8% 20% 39% 16%	1782
	11th to 20th	Day	16% 4 7% 27% 36% 11%	1710
	21st to end	Day	24% 4 6% 20% 30% 16%	1710
December	1st to 10th	Day	21% 5% 11% 29% 24% 10%	1563
	11th to 20th	Day	28% 5% 10% 19% 28% 9%	1924
	21st to end	Day	22% 4 10% 18% 33% 14%	2794
January	1st to 10th	Night	28% 5% 10% 25% 24% 8%	4225
	11th to 20th	Night	19% 6% 15% 33% 22% 6%	4110
	21st to end	Night	27% 6% 11% 23% 26% 7%	4521
February	1st to 10th	Night	25% 4 11% 23% 25% 12%	2437
	11th to 20th	Night	27% 4 8% 25% 23% 13%	2218
	21st to end	Night	24% 3 7% 16% 33% 17%	1884
March	1st to 10th	Night	24% 5% 8% 22% 27% 15%	2198
	11th to 20th	Night	28% 5% 9% 20% 29% 10%	2068
	21st to end	Night	26% 5% 7% 21% 32% 10%	2098
April	1st to 10th	Night	22% 4 8% 24% 28% 16%	1800
	11th to 20th	Night	24% 5% 8% 20% 26% 17%	1777
	21st to end	Night	22% 5% 10% 19% 32% 11%	1800
May	1st to 10th	Night	21% 5% 9% 18% 31% 17%	1800
	11th to 20th	Night	29% 8% 11% 19% 21% 12%	1657
	21st to end	Night	18% 5% 12% 20% 23% 21%	1552
June	1st to 10th	Night	21% 9% 15% 19% 19% 18%	1440
	11th to 20th	Night	16% 5% 8% 14% 22% 35%	1440
	21st to end	Night	27% 8% 12% 16% 18% 20%	1440
July	1st to 10th	Night	30% 12% 16% 17% 12% 12%	1400
	11th to 20th	Night	27% 13% 23% 18% 12% 7%	1558
	21st to end	Night	33% 16% 29% 16% 6% 1	1674
August	1st to 10th	Night	28% 15% 22% 16% 11% 8%	1666
	11th to 20th	Night	30% 15% 21% 18% 12% 5%	1778
	21st to end	Night	25% 11% 18% 26% 14% 5%	1980
September	1st to 10th	Night	26% 10% 17% 22% 17% 8%	1800
	11th to 20th	Night	24% 7% 14% 16% 23% 15%	1800
	21st to end	Night	19% 6% 9% 20% 32% 14%	1991
October	1st to 10th	Night	25% 5% 9% 21% 23% 17%	2160
	11th to 20th	Night	14% 3 5% 17% 37% 25%	2160
	21st to end	Night	17% 2 8% 22% 36% 15%	2376
November	1st to 10th	Night	13% 3 6% 24% 38% 15%	2277
	11th to 20th	Night	14% 3 7% 24% 38% 13%	2470
	21st to end	Night	25% 3 7% 18% 31% 16%	2470
December	1st to 10th	Night	22% 4 10% 29% 26% 8%	2612
	11th to 20th	Night	27% 5% 10% 19% 28% 10%	3272
	21st to end	Night	26% 4 9% 20% 31% 12%	4873

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% 20% 43% 22% 6%	270
	11th to 20th	Day	12% 21% 40% 22% 5%	270
	21st to end	Day	3 17% 45% 23% 11% 1	297
February	1st to 10th	Day	5% 24% 44% 23% 4	270
	11th to 20th	Day	7% 24% 48% 18% 3	270
	21st to end	Day	13% 32% 39% 13% 3	225
March	1st to 10th	Day	7% 26% 37% 25% 4	349
	11th to 20th	Day	12% 25% 33% 23% 5% 1	449
	21st to end	Day	12% 34% 34% 17% 3	462
April	1st to 10th	Day	10% 26% 40% 20% 4	420
	11th to 20th	Day	13% 30% 35% 16% 5%	412
	21st to end	Day	8% 30% 40% 18% 3	420
May	1st to 10th	Day	7% 22% 44% 22% 5% 1	423
	11th to 20th	Day	5% 15% 38% 30% 9% 2	505
	21st to end	Day	4 15% 34% 35% 11% 1	679
June	1st to 10th	Day	2 7% 26% 44% 21% 1	630
	11th to 20th	Day	3 10% 26% 38% 22% 2	630
	21st to end	Day	6% 6% 21% 37% 26% 4	630
July	1st to 10th	Day	4 1 16% 37% 37% 5%	621
	11th to 20th	Day	3 1 9% 37% 38% 12%	447
	21st to end	Day	3 1 8% 31% 46% 11%	487
August	1st to 10th	Day	4 2 11% 39% 36% 7%	447
	11th to 20th	Day	4 2 19% 38% 33% 3	437
	21st to end	Day	6% 1 16% 39% 33% 5%	495
September	1st to 10th	Day	6% 2 17% 42% 28% 6%	450
	11th to 20th	Day	5% 3 27% 42% 19% 4	450
	21st to end	Day	4 7% 27% 37% 20% 4	284
October	1st to 10th	Day	8% 14% 27% 32% 19% 1	270
	11th to 20th	Day	7% 11% 33% 29% 17% 2	270
	21st to end	Day	10% 12% 30% 32% 13% 2	297
November	1st to 10th	Day	6% 20% 40% 26% 8%	270
	11th to 20th	Day	3 12% 40% 31% 13%	270
	21st to end	Day	8% 23% 36% 21% 11% 1	270
December	1st to 10th	Day	6% 19% 41% 25% 9%	270
	11th to 20th	Day	6% 21% 44% 23% 6%	270
	21st to end	Day	12% 25% 41% 19% 3	297
January	1st to 10th	Night	5% 9% 39% 35% 11% 1	836
	11th to 20th	Night	6% 8% 44% 31% 9% 1	760
	21st to end	Night	7% 6% 42% 34% 10% 2	836
February	1st to 10th	Night	7% 9% 44% 33% 7%	760
	11th to 20th	Night	8% 10% 47% 29% 6%	744
	21st to end	Night	10% 10% 54% 24% 2	628
March	1st to 10th	Night	7% 11% 43% 32% 7%	760
	11th to 20th	Night	7% 11% 36% 36% 10%	752
	21st to end	Night	5% 13% 42% 33% 6%	712
April	1st to 10th	Night	5% 13% 48% 30% 4	540
	11th to 20th	Night	8% 16% 38% 31% 7%	533
	21st to end	Night	6% 11% 45% 32% 6%	540
May	1st to 10th	Night	6% 8% 40% 36% 11%	540
	11th to 20th	Night	7% 7% 33% 37% 15% 1	531
	21st to end	Night	5% 9% 34% 41% 11%	584
June	1st to 10th	Night	3 4 27% 49% 18% 1	540
	11th to 20th	Night	2 4 30% 48% 16% 1	540
	21st to end	Night	4 4 18% 50% 24% 1	540
July	1st to 10th	Night	4 1 11% 46% 36% 1	525
	11th to 20th	Night	4 8% 38% 46% 5%	522
	21st to end	Night	5% 1 8% 32% 49% 6%	591
August	1st to 10th	Night	3 1 9% 33% 47% 7%	537
	11th to 20th	Night	5% 1 12% 44% 35% 4	534
	21st to end	Night	3 1 11% 42% 39% 5%	594
September	1st to 10th	Night	6% 1 11% 47% 32% 3	540
	11th to 20th	Night	6% 1 12% 50% 29% 2	540
	21st to end	Night	6% 3 21% 48% 21% 1	565
October	1st to 10th	Night	7% 5% 25% 44% 18% 1	720
	11th to 20th	Night	4 5% 30% 45% 15% 2	720
	21st to end	Night	5% 6% 31% 37% 18% 3	792
November	1st to 10th	Night	4 5% 32% 42% 15% 1	797
	11th to 20th	Night	3 6% 36% 40% 13% 2	950
	21st to end	Night	9% 7% 36% 33% 13% 2	950
December	1st to 10th	Night	8% 9% 41% 34% 8% 1	950
	11th to 20th	Night	9% 7% 41% 34% 8%	950
	21st to end	Night	10% 9% 45% 30% 5%	1045

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